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post #1 of (permalink) Old 11-21-1999, 12:40 AM
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indy 500 help

Have a '97 indy 500 that I cannot get to start consistantly. It takes a lot of pulling to get a few sputters and an occassional back fire out the pipe. After a while you can usually get it statred and it runns real good, if you let it die at low rpm's or turn it off you usually have to let it cool down to get it started again. Replaced the crank seals (0ne was cracked and had a chunk out of it) and that didn't help. Rebuilt the carbs with all new mikuni parts, it has 120lbs compression in both cylinders, fuel pump works and pugs have spark. Any ideas would be greatly appreciated. Only thing I can think to try is buy a new cdi, but thats alittle pricey when I don't know if thats the problem.

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post #2 of (permalink) Old 11-21-1999, 09:08 AM
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Re: indy 500 help

Madmax, are your floats adjusted correctly, and did you change your needle and seats when you went through your carbs? it sounds to me like a typical loading up problem. Fuel gets it the bottom of the crank, and it will be a bear to start, it will pull over fine, just won't fire. Under this condition, when you pull the plugs they would be damp or wet (not neccisarily soaked), and when you put them back in, it will kind of sputters the first pull or two, but still won't start Next time this happens, pull the plugs, tilt the sled on its side. and with the hood open, give it a couple pulls. If gas comes shooting out of either cylinder, the bottom of your case has loaded up with fuel. if thats the case, it's either needle and seats need replaced, or the float level is off.

The other situation which isn't all that fun is that you may have a crank case leak. You might check your drain plug in the bottom of the case to make sure it's tight, or when it was put back together, whoever did it may not have got all the surfaces clean, and/or didn't get enouph crank case sealant all the way around the surfaces, creating the same problem as a leaky seal. One way to check that is to spray starting fluid (or some prefer Propane) around the crank case seam, and seals while it is running, and see if your rpm's change, or see if it runs eratically. When you refer to it being hard to start when it's hot, it makes me lean more to a crank case leak, but always start with the easy stuff first(carbs). The other thing it could possibly be is coils, giving it a spark, just a weak one. But if that were the case it generally wouldn't run well at any time.

Good Luck!

ps You hear anything back on availability?


post #3 of (permalink) Old 11-21-1999, 11:30 PM
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Re: indy 500 help

If you find that it is getting too much fuel, it could be as simple as a fuel pump diaphram with a small hole in it, allowing fuel to be drawn into the engine through the vacume line.


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