 |
 | Lambretta Race Crankshaft 58mm stroke GP DL Meceur |  |  | US $190.12 | 24d 16h 33m |
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 | Billet Aluminum Ford Crank Pulley V-Belt SBF 302 351W 351C Crankshaft 2 Groove | | | US $56.00 | 23d 18h 4m |
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 | ford 2.5 pistons rods crankshaft esslinger 2.3 2300 racing mini stock | | 0 Bid | US $1,300.00 | 2d 16h |
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 | ALL BALLS Crankshaft Bearing/Seals Honda XL250S ’78-81 | | | US $44.90 | 4d 21h 9m |
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Racing Crankshaft
How long can you race with a stock crankshaft? And how do you know when its time to be replaced?
The machine:
2005 Polaris Predator 90
modified cyl & head ported and polished
clutch kit 1500rpm springs
4gram weights
piped Hetrick 2 stroke pipe
3+ dual a arms with Elka Suspinsion
rear swing arm Hetrick Mod +2
front sprocket 15
rear sprocket 34
RK chain
52mm Wisco piston
Hetrick CDI box
1 minute ago
The machine:
2005 Polaris Predator 90
modified cyl & head ported and polished
clutch kit 1500rpm springs
4gram weights
piped Hetrick 2 stroke pipe
3+ dual a arms with Elka Suspinsion
rear swing arm Hetrick Mod +2
front sprocket 15
rear sprocket 34
RK chain
52mm Wisco piston
Hetrick CDI box
Stock crank shaft
we have raced it for 2 years.
If you guys would be so kind as to give us a few details, you would get, at worse an educated guess as an answer. I am not just picking on you, but about 50% of the questions on this site are impossible to give a reasonable answer, due to lack of details.
Give:
Year, Make, model.
Type racing, or other use.
Modifications
If performance related, weight, and experience level of rider.
For any question, give all the info you have on the situation.You can not give to much, but one thing left out can make it impossible to even get close.
I have told several folks that Answers can be the best comic strip you can read. Lets make it into a real, useable, helpful site. I, and I know several others take great pride in helping folks, and do not like the unanserable questions. I have spent over 50 years of my life building racing, and repairing motorcycles. I am no wizard, or super man, but do know quite a bit about these things, most learned the hard way, from experience. It pleases me to be able to assist someone with less experience, and to teach then some of what I know. I think many of the folks who answer feel the same way. So, help us to help you, and we all learn.
Tomcotexas.
Not knowing how long you run in a race, and how many a season, I will make a SWAG, in hours of running. An engine like this, I would recommend a crank replacement for each 50 hours of running. A crank failure is likely to take the cylinder, and maybe crankcase out with it, maybe even the head. The price of a crank is small, compared to the cases and cylinder. If it is at max revs for most of the time, this may be a bit high hours, if at max less than 25%, then likely safe for 75,maybe 100 hours. Hate to have to say it this way, often in racing, you do not know the limits till you blow a couple up. Keep notes of each race, you will be surprised how valuable they will be. An example - in the good old days of drag racing, a really good running Triumph 650 got rings about each month, valves, mains, and inserts - at least twice a season, Went too Sportster Strokers, Lap rods, fit new rod rollers, new mains, usually pistons and rings before start of season. Also valves if over a .400 lift cam was used. Mid season, new rings, lap valves, check anything. Big bore Kawasaki Z1 or KZ engines - build it and run it. Rings and check valves before leaving for
Bonneville. Time wise, average maintenance on Triumph - 8 hrs/meet. Sportster - 2 hrs/meet. Kawasaki - 15 minutes meet. Note, this is engine/drive numbers, rear chains, tires, sprockets, etc vary. Used a lot more tires on the Kaws.
Aah- the good old days.
Tomcotexas.
|
| Lambretta Race Crankshaft 58mm stroke GP DL Meceur | | | US $190.12 | 24d 16h 33m |
| Crank Turning Socket sb Chevy 262 265 283 305 307 327 350 400 sbc Crankshaft | | | US $18.99 | 14d 14h 17m |
| Unorthodox Racing Crankshaft Pulley 2g DSM 95-99 Turbo 4g63 Eclipse Talon | | | US $65.00 | 1d 12h 6m |
| Crankshaft Pulley for Ford Racing Water Short Pump 1V | | | US $66.00 | 28d 19h 7m |
| O.S. MAX CRANKSHAFT FOR VINTAGE .29R RACING ENGINE | | 0 Bid | US $39.99 | 2d 52m |
| Billet Aluminum Ford Crank Pulley V-Belt SBF 302 351W 351C Crankshaft 2 Groove | | | US $56.00 | 23d 18h 4m |
| Pontiac 2V Crankshaft Pulley 350 400 428 455 Crank Billet Aluminum 6 Bolt Damper | | | US $82.00 | 29d 2h 32m |
| ford 2.5 pistons rods crankshaft esslinger 2.3 2300 racing mini stock | | 0 Bid | US $1,300.00 | 2d 16h |
| Big Block Ford Crankshaft Pulley 429 460 3V Crank BBF Billet Aluminum A/C Air | | | US $68.00 | 23d 19h 39m |
| Mopar SB Crankshaft Pulley 318 340 360 1V-belt Crank | | | US $56.00 | 25d 20h 11m |
| Zenoah G260PUM Option Racing Crankshaft 30mm Stroke-Up High-Demand MOD 577953201 | | | US $64.99 | 19d 3h 41m |
| SBC ALUMINUM CRANKSHAFT LOWER PULLEYS DOUBLE GROOVE: CHROME (SWP) | | | US $41.00 | 25d 4h 48m |
| Honda Hobbit PA50 PA50II CAMINO MOPED STUFFED RACING CRANKSHAFT crank engine | | | US $114.95 | 2d 10h 8m |
| Billet Aluminum Corvette Crankshaft Pulley V-Belt 283 350 400 Crank SBC SWP AC | | | US $74.00 | 7d 16h 13m |
| Summit G3972 Crankshaft Pulley V-Belt 3-Groove 7.25" Steel Chrome SBC Short Pump | | | US $42.90 | 19d 11h 15m |
| Ford FE Engine Crankshaft Pulley 390 427 428 2V Crank Polished Billet Aluminum | | | US $56.00 | 7d 12h 38m |
| Banshee 68mm 465cc +10mm Wampus Cub Top End 10 Mil Crankshaft Trinity Head | | | US $1,949.99 | 13d 19h 53m |
| Ford Racing Crankshaft Pulley Spacer M-8510-B351 | | | US $39.90 | 10d 13h 54m |
| Racing Engine Builders Handbook : Crankshafts, Balancing, Damper, and Bearings | | | US $32.09 | 9d 8h 37m |
| ALL BALLS Crankshaft Bearing/Seals Honda XL250S ’78-81 | | | US $44.90 | 4d 21h 9m |
 | *22 CAMARO-CHEVELLE-CORVETTE 350 STEEL CRANKSHAFT 1182 G.M. STOCK OR RACE | | | US $289.98 | 29d 15h 48m |
 | Billet Aluminum Big Block Ford Crankshaft Pulley 429 460 2V BBF Crank Underdrive | | | US $62.00 | 23d 19h 11m |
 | Pontiac High Flow 2V Crankshaft Pulley 350 400 428 455 Overdrive Crank Aluminum | | | US $76.00 | 29d 2h 28m |
 | NEW SBC 4340 USA FORGED CRANK 350 3.50 5.7 CRANKSHAFT | | | US $589.99 | 20d 2h 52m |
 | TM Racing 125 Engine Crankshaft Crank Asm. TM125 98/99 Birel Moto Shifter Kart | | | US $216.59 | 29d 23h 41m |
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 | Losi TLR Racing LOSR2312 Crankshaft: 350 | | | US $54.20 | 29d 21h 10m |
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 | Losi TLR Racing LOSR2212 Crankshaft: 454 | | | US $48.64 | 29d 21h 9m |
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 | POLARIS TURBO RZR-S RZR-4 RZR800 CRANKSHAFT PRIMARY SECONDARY CLUTCH SUPPORT | | | US $324.99 | 23d 20h 50m |
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 | #18 chevy 400 used crankshaft camaro chevelle s10 nova stock race drag boat | | | US $149.89 | 29d 15h 13m |
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suzuki GT750 racing crankshaft
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