98 indy 500 I pull it over cold and it backfired, and wont start
New rebiult motor everything pistons,rings,crank,berrings,seals. Ran it 300 miles last year fine. this year got water through air box, drained cylinders, oiled,cleaned carbs. it ran ok for while till winter and cold came. now i pull and pull and smell gas but doesnt start good at all?????
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Re: 98 indy 500 I pull it over cold and it backfired, and...
It sounds like some of that water turned to steam in the engine and the pressure of the steam did some damage. Check out the timing chain and the timing mark alignment. Check out the valve condition...there might be some chipped or cracked valves...yikes!
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A backfire usually indicates a timing issue. I recommend a minor tune up, which will include new plugs and wires, as well as checking/setting the distributor timing. An oil change is also recommended after the issue is corrected, as offset timing can cause fuel to remain in cylinder, which then bleeds past the piston rings and ends up in the crankcase with the engine oil.
anything below 100psi on 2strokes is usless and needs new rings as long as no damage and in tolerance to pistons ! reed valves and crank seals have nothing to do with piston compression , they work on crankcase pressure !
Ok I thinking with the info you posted I have a small thing you can check on the wiring harness by the pull start (recoil) side of the engine there will be a small black box this is a relay (Bosch 30/40) go to any parts store and purchase one cost is from 4.00 to 10.00 and replace it what I think is happening is when you try to rev up the machine it's breaking contact of this relay I hope this helps do not get rid of this machine I'm sure it's a simple fix also check for fouled spark plug this can cause similar issues I hope this help
Not sure what to say other than its fuel starvation, if not already done replace the fuel filter in the tank, if no better i would suspect a massive air leak, so replace the crank seals, if there is no primary compression in the crankcsae fuel will not pull through the engine, good luck.
You should purchase a gasket and seal set, pull your motor out of the sled, disassemble the motor, and replace all the gaskets and seals. You can purchase a piston kit on line that should come with pistons , rings , gaskets , and seals.The main problem you are having is an air leak on one or both of the crank end seals. Usually the clutch side seal leaks first. If you continue to drive you will probably score one or both of the cylinders.When you have the motor apart clean your carburetors and replace your spark plug caps. NGK has new plug caps for about $5 each. If your cylinders look good i would consider doing a light hone job and ring replacement. Again if you just buy new aftermarket seals pistons and gaskets you should be able to do a complete rebuild for about $150. Then your engine will be good for another 25 years. If you are limited on funds Just replace the crank seals , clean the carburetors, and put on new NGK plug caps (about $30).
Wait, it just wont turn over, like the engine won't rotate?, that is either a broken crank, which not unusual for those 500's or you seized it, (welded the piston to the jugs). if this isn't what you mean, and it will turn over but not on its own power, then either your jets in the carbs are clogged, fuel may get to it, but not through it, or your rings are stuck closed and giving you low compression, check this by pulling it over slowly, you should feel each piston completing the revolution with a prominent glug glug. grab your primary clutch and rotate it back and forth, it should have a bit of play, but if it clanks and has alot of play, your crank is busted