The coin cost for an upgrade is the minimum possible cost, when you have all of the associated parts. How to calculate the cost is in the following spoiler tag:
Spoiler:  Show
To determine the upgrade cost, subtract 1000 for each level 1 item required, 3000 for each level 2 item, 9000 per level 3, 27000 per level 4, and 81000 per level 5. For example, an upgrade costing 100000 if you don't have any of the three items Bolt3, Nut4, Spring3 would cost 100000 - 9000 - 27000 - 9000 = 55000 with all items. A similar computation can be done to determine the cost for any combination of items.

xitooner broke down the cost to upgrade each bike from 0 to 10.

Column order is Handlebars / Engine / Wheels / Chassis, same as in the game.

If you think any of the data recorded here is incorrect, please post screenshots so I can verify if a change needs to be made.

Spoiler:  Show
 Level 1 3 seconds No Item 100 Piston1 100 No Item 100 No Item 100 Level 2 30 seconds No Item 250 Spark1 250 3 seconds Gear1 225 No Item 250 Level 3 30 minutes Nut1 500 Piston1 550 Brake1 475 Chain1 525 Level 4 2 hours Spring1 1000 Spark1 1100 Nut1 Brake1 950 Sheet1 1050 Level 5 6 hours Bolt1 1500 Spark1 1650 Bolt1 Brake1 1400 Bolt1 Sheet1 1600 Level 6 12 hours Spring1 Nut1 Pipe1 2500 Nut1 Spark1 Piston1 2750 Nut1 Brake1 Gear1 2250 Chain1 Nut1 Sheet1 2600 Level 7 1 day Spring1 Bolt1 Pipe1 6000 Bolt1 Spark2 Piston1 8000 Bolt2 Brake2 Gear1 5000 Chain1 Bolt2 Sheet2 7000 Level 8 2 days Spring2 Nut2 Pipe2 10000 Nut2 Spark2 Piston2 15000 Nut2 Brake2 Gear2 9000 Chain2 Nut2 Sheet2 14000 Level 9 3 days Spring2 Bolt2 Pipe3 30000 Bolt2 Spark2 Piston3 50000 Bolt2 Brake2 Gear3 25000 Chain3 Bolt2 Sheet2 47500 Level 10 4 days Spring3 Nut3 Pipe3 60000 Nut3 Spark3 Piston3 80000 Nut3 Brake3 Gear3 50000 Chain3 Nut3 Sheet3 75000

Tango
Spoiler:  Show
 Level 1 15 minutes Spring2 300 5 seconds Nut1 Piston1 300 Nut1 Gear1 300 Nut1 Sheet1 300 Level 2 30 minutes Bolt1 Pipe1 1000 Bolt1 Spark1 1200 Bolt1 Brake1 Gear1 900 Bolt1 Nut1 Sheet1 1100 Level 3 45 minutes Spring2 Nut1 Pipe1 2000 Nut1 Spark1 Piston1 2400 Nut1 Brake1 Gear1 1800 Chain2 Nut1 Sheet1 2200 Level 4 4 hours Spring1 Bolt2 Pipe1 4000 Bolt2 Spark1 Piston1 4400 Bolt2 Brake1 Gear1 3800 Chain1 Bolt2 Sheet1 4200 Level 5 12 hours Spring2 Nut2 Pipe1 6500 Nut2 Spark2 Piston1 7000 Nut2 Brake2 Gear1 6300 Chain2 Nut2 Sheet1 6800 Level 6 1 day Spring2 Bolt2 Pipe2 10000 Bolt2 Spark2 Piston2 11000 Bolt2 Brake2 Gear2 9700 Chain2 Bolt2 Sheet2 10000 Level 7 2 days Spring3 Nut3 Pipe2 20000 Nut3 Spark3 Piston2 22000 Nut3 Brake3 Gear2 20000 Chain3 Nut3 Sheet2 21000 Level 8 3 days Spring3 Bolt3 Pipe3 35000 Bolt3 Spark3 Piston3 40000 Bolt3 Brake3 Gear3 33000 Chain3 Bolt3 Plate3 29000 Level 9 4 days Spring3 Nut3 Pipe4 60000 Nut4 Spark3 Piston3 70000 Nut4 Brake3 Gear3 57500 Chain3 Nut4 Sheet3 67500 Level 10 5 days Spring3 Bolt4 Pipe4 120000 Bolt3 Spark4 Piston4 140000 Bolt4 Brake4 Gear3 115000 Chain3 Bolt4 Sheet4 130000

Bronco
Spoiler:  Show
 Level 1 45 minutes Spring2 Pipe1 2000 Spark2 Piston1 2500 Brake2 Gear1 1750 Chain2 Sheet1 2250 Level 2 4 hours Spring1 Nut2 Pipe2 4000 Nut2 Spark1 Piston1 5000 Nut1 Brake1 Gear2 3500 Chain1 Nut2 Sheet1 4500 Level 3 8 hours Spring1 Bolt2 Pipe2 6500 Bolt1 Nut2 Spark1 8000 Bolt2 Brake2 Gear1 6250 Chain1 Bolt2 Sheet2 7500 Level 4 12 hours Spring2 Nut2 Pipe1 10000 Nut2 Spark2 Piston1 11000 Nut2 Brake1 Gear1 9500 Chain1 Nut2 Sheet1 10000 Level 5 1 day Spring2 Bolt2 Pipe1 20000 Bolt2 Spark2 Piston1 22000 Bolt2 Brake2 Gear1 19000 Chain2 Bolt2 Sheet1 21000 Level 6 2 days Spring2 Nut2 Pipe2 35000 Nut2 Spark2 Piston2 38000 Nut2 Brake2 Gear2 33500 Chain2 Nut2 Sheet2 36500 Level 7 3 days Spring3 Bolt2 Pipe3 50000 Bolt2 Spark3 Piston3 54000 Bolt2 Brake3 Gear3 47500 Chain3 Bolt2 Sheet3 43000 Level 8 4 days Spring3 Nut3 Pipe3 75000 Nut3 Spark3 Piston3 80000 Nut3 Brake3 Gear3 70000 Chain3 Nut3 Sheet3 75000 Level 9 5 days Spring4 Bolt3 Pipe4 100000 Bolt3 Spark4 Piston4 125000 Bolt3 Brake4 Gear4 90000 Chain4 Bolt3 Sheet4 115000 Level 10 6 days Spring4 Nut4 Pipe4 200000 Nut4 Spark4 Piston4 220000 Nut4 Brake4 Gear4 180000 Chain4 Nut4 Sheet4 210000

Jackal
Spoiler:  Show
 Level 1 45 minutes Spring2 Nut1 Pipe1 500 Nut1 Spark2 Piston1 500 Nut1 Brake1 Gear2 400 Chain2 Nut1 Sheet1 450 Level 2 4 hours Spring1 Nut2 Pipe2 1500 Nut2 Spark1 Piston2 1750 Nut2 Brake2 Gear1 1400 Chain1 Nut2 Sheet2 1600 Level 3 8 hours Spring2 Bolt2 Pipe1 3000 Bolt2 Spark2 Piston1 3500 Bolt2 Brake2 Gear1 2800 Chain2 Bolt2 Sheet1 3300 Level 4 12 hours Spring2 Nut2 Pipe2 6000 Nut2 Spark2 Piston2 7000 Nut2 Brake2 Gear2 5500 Chain2 Nut2 Sheet2 6500 Level 5 1 day Spring2 Bolt3 Pipe2 10000 Bolt3 Spark2 Piston2 11500 Bolt3 Brake2 Gear2 9000 Chain2 Bolt3 Sheet2 10750 Level 6 2 days Spring2 Nut3 Pipe3 20000 Nut3 Spark2 Piston3 22000 Nut3 Brake2 Gear3 19000 Chain2 Nut3 Sheet3 21000 Level 7 3 days Spring3 Bolt3 Pipe3 35000 Bolt3 Spark3 Piston3 38000 Bolt3 Brake3 Gear3 33500 Chain3 Bolt3 Plate3 37500 Level 8 4 days Spring3 Nut4 Pipe3 50000 Nut4 Spark3 Piston3 55000 Nut4 Brake3 Gear3 45000 Chain3 Nut4 Sheet3 54000 Level 9 5 days Spring3 Bolt4 Pipe4 75000 Bolt4 Spark3 Piston4 85000 Bolt4 Brake3 Gear4 75000 Chain3 Bolt4 Sheet4 80000 Level 10 6 days Spring4 Nut4 Pipe4 150000 Nut4 Spark4 Piston4 160000 Nut4 Brake4 Gear4 130000 Chain4 Nut4 Sheet4 150000

Mantis
Spoiler:  Show
 Level 1 4 hours Spring2 Nut2 Pipe1 2000 Nut2 Spark2 Piston1 2250 Nut2 Brake2 Gear1 1950 Chain2 Nut1 Sheet2 2100 Level 2 8 hours Spring2 Bolt2 Pipe1 8500 Bolt2 Spark2 Piston1 6750 Bolt2 Brake2 Gear2 6250 Chain2 Bolt2 Sheet2 6600 Level 3 1 day Spring2 Nut2 Pipe2 10000 Nut2 Spark3 Piston2 11000 Nut2 Brake3 Gear2 9750 Chain2 Nut2 Sheet3 15000 Level 4 2 days Spring2 Bolt3 Pipe3 20000 Bolt2 Spark2 Piston3 21500 Bolt2 Brake2 Gear3 19000 Chain2 Bolt2 Sheet3 21000 Level 5 3 days Spring2 Nut3 Pipe3 35000 Nut3 Spark2 Piston3 37500 Nut3 Brake2 Gear3 33500 Chain2 Nut3 Sheet3 36500 Level 6 4 days Spring3 Bolt3 Pipe3 50000 Bolt3 Spark3 Piston3 52500 Bolt3 Brake3 Gear3 48000 Chain3 Bolt3 Sheet3 51000 Level 7 5 days Spring3 Nut4 Pipe3 75000 Nut4 Spark3 Piston3 80000 Nut4 Brake3 Gear3 70000 Chain3 Nut4 Sheet3 75000 Level 8 6 days Spring3 Bolt4 Pipe4 125000 Bolt4 Spark3 Piston4 135000 Bolt4 Brake3 Gear4 110000 Chain3 Bolt4 Sheet4 125000 Level 9 7 days Spring4 Nut4 Pipe4 150000 Nut4 Spark4 Piston4 170000 Nut4 Brake4 Gear4 140000 Chain4 Nut4 Sheet4 160000 Level 10 8 days Spring4 Nut5 Pipe4 200000 Nut5 Spark4 Piston4 220000 Nut5 Brake4 Gear4 180000 Chain4 Nut5 Sheet4 200000

Marauder
Spoiler:  Show
 Level 1 8 hours Spring1 Nut2 Pipe2 6500 Nut2 Spark1 Piston2 6750 Nut2 Brake1 Gear2 6250 Chain1 Nut2 Sheet2 6600 Level 2 1 day Spring2 Bolt2 Pipe2 10000 Bolt2 Spark2 Piston2 11000 Bolt2 Brake2 Gear2 9750 Chain2 Bolt2 Sheet2 15000 Level 3 2 days Spring2 Nut3 Pipe2 20000 Nut3 Spark2 Piston2 21500 Nut3 Brake2 Gear2 19000 Chain2 Nut3 Sheet2 21000 Level 4 3 days Spring3 Bolt3 Pipe3 35000 Bolt3 Spark3 Piston3 37500 Bolt3 Brake3 Gear3 33500 Chain3 Bolt3 Sheet3 36500 Level 5 4 days Spring3 Nut3 Pipe4 50000 Nut3 Spark3 Piston4 52500 Nut3 Brake3 Gear4 48000 Chain3 Nut3 Sheet4 51000 Level 6 5 days Spring4 Bolt3 Pipe4 75000 Bolt3 Spark4 Piston4 80000 Bolt3 Brake4 Gear4 70000 Chain4 Bolt3 Sheet4 75000 Level 7 6 days Spring4 Nut4 Pipe4 100000 Nut4 Spark4 Piston4 110000 Nut4 Brake4 Gear4 100000 Chain4 Nut4 Sheet4 105000 Level 8 7 days Spring4 Bolt4 Pipe4 125000 Bolt4 Spark4 Piston4 140000 Bolt4 Brake4 Gear44 125000 Chaint4 Bolt4 Sheet4 130000 Level 9 8 days Spring4 Nut4 Pipe5 150000 Nut4 Spark4 Piston5 175000 Nut4 Brake4 Gear5 160000 Chain4 Nut4 Sheet5 165000 Level 10 9 days Spring5 Bolt4 Pipe5 200000 Bolt4 Spark5 Piston5 225000 Bolt4 Brake5 Gear5 190000 Chain5 Bolt4 Sheet5 200000

Riptide
Spoiler:  Show
 Level 1 4 hours Spring2 Nut2 Pipe2 1500 Nut2 Spark2 Piston2 1750 Nut2 Brake2 Gear2 1250 Chain2 Nut2 Sheet2 1650 Level 2 8 hours Spring2 Bolt2 Pipe3 3000 Bolt2 Spark2 Piston3 3500 Bolt2 Brake2 Gear3 2750 Chain2 Bolt2 Sheet3 3300 Level 3 1 day Spring2 Nut3 Pipe3 6000 Nut3 Spark2 Piston3 7500 Nut3 Brake2 Gear3 5500 Chain2 Nut3 Sheet3 7000 Level 4 2 days Spring3 Bolt3 Pipe3 10000 Bolt3 Spark3 Piston3 15000 Bolt3 Brake3 Gear3 9000 Chain3 Bolt3 Sheet3 14000 Level 5 3 days Spring3 Nut4 Pipe3 20000 Nut4 Spark3 Piston3 25000 Nut4 Brake3 Gear3 18500 Chain3 Nut4 Sheet3 22500 Level 6 4 days Spring3 Bolt4 Pipe4 40000 Bolt4 Spark3 Piston4 50000 Bolt4 Brake3 Gear4 37500 Chain3 Bolt4 Sheet4 45000 Level 7 5 days Spring4 Nut4 Pipe4 75000 Nut4 Spark4 Piston4 85000 Nut4 Brake4 Gear4 70000 Chain4 Nut4 Sheet4 80000 Level 8 6 days Spring4 Bolt4 Pipe4 100000 Bolt4 Spark4 Piston4 120000 Bolt4 Brake4 Gear4 90000 Chain4 Bolt4 Sheet4 110000 Level 9 7 days Spring5 Nut5 Pipe5 175000 Nut5 Spark5 Piston5 200000 Nut5 Brake5 Gear5 160000 Chain5 Nut5 Sheet5 190000 Level 10 8 days Spring5 Bolt5 Pipe5 250000 Bolt5 Spark5 Piston5 275000 Bolt5 Brake5 Gear5 225000 Chain5 Bolt5 Sheet5 260000

Berserker
Spoiler:  Show
 Level 1 8 hours Spring2 Nut2 Pipe2 6500 Nut2 Spark2 Piston2 7500 Nut2 Brake2 Gear2 6250 Chain2 Nut2 Sheet2 7000 Level 2 1 day Spring3 Bolt2 Pipe3 10000 Bolt2 Spark3 Piston3 12500 Bolt2 Brake3 Gear3 9500 Chain3 Bolt2 Sheet3 12000 Level 3 2 days Spring3 Nut3 Pipe3 20000 Nut3 Spark3 Piston3 25000 Nut3 Brake3 Gear3 19000 Chain3 Nut3 Sheet3 24000 Level 4 4 days Spring3 Bolt3 Pipe4 40000 Bolt3 Spark3 Piston4 50000 Bolt3 Brake3 Gear4 37500 Chain3 Bolt3 Sheet4 45000 Level 5 5 days Spring4 Nut4 Pipe4 60000 Nut4 Spark4 Piston4 75000 Nut4 Brake4 Gear4 55000 Chain4 Nut4 Sheet4 70000 Level 6 6 days Spring4 Bolt4 Pipe4 100000 Bolt4 Spark4 Piston4 110000 Bolt4 Brake4 Gear4 90000 Chain4 Bolt4 Sheet4 105000 Level 7 7 days Spring4 Nut4 Pipe4 160000 Nut4 Spark4 Piston4 170000 Nut4 Brake4 Gear4 140000 Chain4 Nut4 Sheet4 160000 Level 8 8 days Spring5 Bolt4 Pipe5 200000 Bolt4 Spark5 Piston5 225000 Bolt4 Brake5 Gear5 190000 Chain5 Bolt4 Sheet5 220000 Level 9 9 days Spring5 Nut5 Pipe5 225000 Nut5 Spark5 Piston5 250000 Nut5 Brake5 Gear5 215000 Chain5 Nut5 Sheet5 240000 Level 10 10 days Spring5 Bolt5 Pipe5 250000 Bolt5 Spark5 Piston5 275000 Bolt5 Brake5 Gear5 240000 Chain5 Bolt5 Sheet5 265000

Phantom
Spoiler:  Show
 Level 1 8 hours Spring2 Nut2 Pipe2 6500 Nut2 Spark2 Piston2 7500 Nut2 Brake2 Gear2 6250 Chain2 Nut2 Sheet2 7000 Level 2 1 day Spring3 Bolt3 Pipe3 10000 Bolt3 Spark3 Piston3 12500 Bolt3 Brake3 Gear3 9500 Chain3 Bolt3 Sheet3 12000 Level 3 2 days Spring3 Nut3 Pipe4 20000 Nut3 Spark3 Piston4 25000 Nut3 Brake3 Gear4 19000 Chain3 Nut3 Sheet4 24000 Level 4 3 days Spring4 Bolt3 Pipe4 40000 Bolt3 Spark4 Piston4 50000 Bolt3 Brake4 Gear4 37500 Chain4 Bolt3 Sheet4 45000 Level 5 4 days Spring4 Nut4 Pipe4 60000 Nut4 Spark4 Piston4 75000 Nut4 Brake4 Gear4 55000 Chain4 Nut4 Sheet4 70000 Level 6 5 days Spring4 Bolt4 Pipe5 100000 Bolt4 Spark4 Piston5 110000 Bolt4 Brake4 Gear5 90000 Chain4 Bolt4 Sheet5 105000 Level 7 6 days Spring4 Nut5 Pipe5 150000 Nut5 Spark4 Piston5 165000 Nut5 Brake4 Gear5 140000 Chain4 Nut5 Sheet5 160000 Level 8 8 days Spring5 Bolt5 Pipe5 200000 Bolt5 Spark5 Piston5 225000 Bolt5 Brake5 Gear5 185000 Chain5 Bolt5 Sheet5 215000 Level 9 10 days Spring5 Nut5 Pipe5 250000 Nut5 Spark5 Piston5 275000 Nut5 Brake5 Gear5 240000 Chain5 Nut5 Sheet5 260000 Level 10 12 days Spring5 Bolt5 Pipe5 300000 Bolt5 Spark5 Piston5 350000 Bolt5 Brake5 Gear5 275000 Chain5 Bolt5 Sheet5 330000

Donkey
Spoiler:  Show
 Level 1 3 seconds 1 Doughnut 6500 1 Doughnut 7500 1 Doughnut 6250 1 Doughnut 7000 Level 2 3 seconds 2 Doughnut 10000 2 Doughnut 12500 2 Doughnut 9500 2 Doughnut 12000 Level 3 3 seconds 3 Doughnut 20000 3 Doughnut 25000 3 Doughnut 19000 3 Doughnut 24000 Level 4 3 seconds 3 Doughnut 40000 3 Doughnut 50000 3 Doughnut 37500 3 Doughnut 45000 Level 5 3 seconds 3 Doughnut 60000 3 Doughnut 75000 3 Doughnut 55000 3 Doughnut 70000 Level 6 3 seconds 3 Doughnut 100000 3 Doughnut 110000 3 Doughnut 90000 3 Doughnut 105000 Level 7 3 seconds 3 Doughnut 150000 3 Doughnut 165000 3 Doughnut 140000 3 Doughnut 160000 Level 8 3 seconds 3 Doughnut 200000 3 Doughnut 225000 3 Doughnut 185000 3 Doughnut 215000 Level 9 3 seconds 3 Doughnut 250000 3 Doughnut 275000 3 Doughnut 240000 3 Doughnut 260000 Level 10 3 seconds 3 Doughnut 300000 3 Doughnut 350000 3 Doughnut 275000 3 Doughnut 330000

Stallion
Spoiler:  Show
 Level 1 3 seconds 1 Doughnut 6500 1 Doughnut 6750 1 Doughnut 6250 1 Doughnut 6600 Level 2 3 seconds 2 Doughnut 10000 2 Doughnut 11000 2 Doughnut 9750 2 Doughnut 15000 Level 3 3 seconds 3 Doughnut 20000 3 Doughnut 21500 3 Doughnut 19000 3 Doughnut 21000 Level 4 3 seconds 3 Doughnut 35000 3 Doughnut 37500 3 Doughnut 33500 3 Doughnut 36500 Level 5 3 seconds 3 Doughnut 50000 3 Doughnut 52500 3 Doughnut 48000 3 Doughnut 51000 Level 6 3 seconds 3 Doughnut 75000 3 Doughnut 80000 3 Doughnut 70000 3 Doughnut 75000 Level 7 3 seconds 3 Doughnut 100000 3 Doughnut 110000 3 Doughnut 100000 3 Doughnut 105000 Level 8 3 seconds 3 Doughnut 125000 3 Doughnut 140000 3 Doughnut 125000 3 Doughnut 130000 Level 9 3 seconds 3 Doughnut 150000 3 Doughnut 175000 3 Doughnut 160000 3 Doughnut 165000 Level 10 3 seconds 3 Doughnut 200000 3 Doughnut 225000 3 Doughnut 190000 3 Doughnut 200000

Agent
Spoiler:  Show
 Level 1 3 seconds Spring3 Pipe3 Doughnut 6500 Spark3 Piston3 Doughnut 6750 Brake3 Gear3 Doughnut 6250 Chain3 Sheet3 Doughnut 6600 Level 2 3 seconds Spring3 Pipe3 Doughnut 10000 Spark3 Piston3 Doughnut 10000 Brake3 Gear3 Doughnut 9750 Chain3 Sheet3 Doughnut 11500 Level 3 3 seconds Spring3 Pipe3 Doughnut 20000 Spark3 Piston3 Doughnut 21500 Brake3 Gear3 Doughnut 19000 Chain3 Sheet3 Doughnut 21000 Level 4 3 seconds Spring3 Pipe4 Doughnut 35000 Spark4 Piston3 Doughnut 37500 Brake3 Gear4 Doughnut 33500 Chain3 Sheet4 Doughnut 36500 Level 5 3 seconds Spring4 Pipe4 Doughnut 50000 Spark4 Piston4 Doughnut 52500 Brake4 Gear4 Doughnut 48000 Chain4 Sheet4 Doughnut 51000 Level 6 3 seconds Spring4 Pipe4 75000 Spark4 Piston4 Doughnut 80000 Brake4 Gear4 Doughnut 70000 Chain4 Sheet4 Doughnut 75000 Level 7 3 seconds Spring4 Pipe4 Doughnut 100000 Spark4 Piston4 Doughnut 110000 Brake4 Gear4 Doughnut 100000 Chain4 Sheet4 Doughnut 105000 Level 8 3 seconds Spring4 Pipe4 Doughnut 125000 Spark4 Piston4 Doughnut 140000 Brake4 Gear4 Doughnut 125000 Chain4 Sheet4 Doughnut 130000 Level 9 3 seconds Spring5 Pipe5 Doughnut 150000 Spark5 Piston5 Doughnut 175000 Brake5 Gear5 Doughnut 160000 Chain5 Sheet5 Doughnut 165000 Level 10 3 seconds Spring5 Pipe5 Doughnut 200000 Spark5 Piston5 Doughnut 225000 Brake5 Gear5 Doughnut 190000 Chain5 Sheet5 Doughnut 200000

Thanks: xitooner, Ch4er0n, sriskus, iviarkD, eflixxx, xschmolex, Mandrake2007, CagBall, Conflyto, lespiritdelescal, luffy1st, Flippant9, timohthey, b4tr0x, Bunnyhop90-

2. Reserving post

3. Is coin cost with or without the parts?

I'll take a look at mine in a bit and try and fill in some blanks.

4. Originally Posted by Mandrake2007 Go to original post
Is coin cost with or without the parts?
With parts (minimum possible coin cost). If you don't feel comfortable calculating the final cost yourself, simply posting a screenshot of whatever state you have it in (such as having a nut, but missing a bolt) would allow me to calculate the correct cost. I could see about typing up a quick explanation of how the cost adjusts when missing parts, but some of the wording might be annoying to make clear.

Originally Posted by Mandrake2007 Go to original post
I'll take a look at mine in a bit and try and fill in some blanks.
Thank you!

5. I sent you a PM with my current info (didnt want to clutter up the forum)

As bikes come out of upgrade I'll send more...

6. Tier 1 maxed, sorry I can't be of help

Jackal

Handlebars (to lvl8) spring3 nut4 pipe3 50000
Engine (to lvl8) nut4 sparkplug3 piston3 55000
Wheels (to lvl8) nut4 brake3 gear3 45000
Frame (to lvl8) chain3 nut4 sheet3 54000

Mantis

Handlebars (to lvl8) spring3 bolt4 pipe4 125000
Engine (to lvl9) nut4 sparkplug4 piston4 170000
Wheels (to lvl9) nut4 brake4 gear4 140000
Frame (to lvl8) chain3 bolt4 sheet4 125000

Marauder

Handlebars (to lvl2) spring2 bolt2 pipe2 10000
Engine (to lvl2) bolt2 sparkplug2 piston2 11000
Wheels (to lvl2) bolt2 brake2 gear2 9750
Frame (to lvl2) chain2 bolt2 sheet2 15000

Riptide

Handlebars (to lvl6) spring3 bolt4 pipe4 40000
Engine (to lvl6) bolt4 sparkplug3 piston4 50000
Wheels (to lvl7) nut4 brake4 gear4 70000
Frame (to lvl7) chain4 nut4 sheet4 80000

Berserker

Phantom

Handlebars (to lvl1) spring2 nut2 pipe2 6500
Engine (to lvl1) nut2 sparkplug2 piston2 7500
Wheels (to lvl1) nut2 brake2 gear2 6250
Frame (to lvl1) chain2 nut2 sheet2 7000

7. This is a fantastic idea. I'll edit this post as soon as my phone resets so I can help. Edited minus those that have already been done.

E L6 - nut1/spark1/piston1 2750
F L5 - bolt1/sheet1 1600

Tango

H L4 - spring1/bolt2/pipe1 4000
E L5 - nut2/spark2/piston1 7000
F L6 - chain2/bolt2/sheet2 10000

Bronco

H L5 - spring2/bolt2/pipe1 20000
E L6 - nut2/spark2/piston2 38000
W L7 - bolt2/brake3/gear3 47500
F L5 - chain2/bolt2/sheet1 21000

Mantis

E L3 - nut2/spark3/piston2 11000
W L4 - nut2/brake2/gear3 19000
F L3 - chain2/nut2/sheet3 15000

Marauder

E L3 - nut3/spark2/piston2 21500
W L3 - nut3/brake2/gear2 19000
F L3 - chain2/nut3/sheet2 21000

Riptide

H L5 - spring3/nut4/pipe3 20000
E L5 - nut4/spark3/piston3 25000

8. Updated with info from: xitooner, Ch4er0n

9. tango

Handlebars (to lvl10) spring3 bolt4 pipe4 120000
Engine (to lvl10) bolt3 sparkplug4 piston4 140000
Wheels (to lvl10) bolt4 bearing4 gear3 115000

bronco

Handlebars (to lvl8) spring3 nut3 pipe3 75000
Engine (to lvl8) bolt3 sparkplug3 piston3 80000

Mantis

Engine (to lvl10) nut5 sparkplug4 piston4 ??????

Frame (to lvl9) chain4 bolt4 sheet4 160000

Berserker

Handlebars (to lvl6) spring4 bolt4 pipe4 100000
Engine (to lvl6) bolt4 sparkplug4 piston4 110000
Wheels (to lvl6) bolt4 bearing4 gear4 9000
Frame (to lvl6) chain4 bolt4 sheet4 105000

10. Originally Posted by sriskus Go to original post
Mantis

Engine (to lvl10) nut5 sparkplug4 piston4 ??????
Could you please tell me how much it currently costs you for this upgrade, as well as which of the items (if any) you have ready to use (that is, NOT displaying a gem cost or "Fuse")?

Originally Posted by sriskus Go to original post
Berserker

Wheels (to lvl6) bolt4 bearing4 gear4 9000
1) By "bearing", do you mean the ring between Pipe and Piston? If so, the game refers to that as a Brake.
2) Is the cost for this upgrade actually 90,000? I suspect that the 9,000 you put was simply a typo.

Updated with info from: sriskus