Engine Issues

Old 06-26-2009, 09:23 PM
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well, on a pirticularly hot and humid night here in IL my picco .12R 3port would not hold a tune to save its life. try as i might, i could not get it below 240-250 and it had terrible low end bog. anyone have any idea what factory settings are? perhaps some suggestions on what might be going on? thanks
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Old 06-26-2009, 11:09 PM
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The words "would not hold a tune", and the high temps suggest an air leak somewhere..Do you know where/what to check?
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Old 06-26-2009, 11:28 PM
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Sounds like you got a air leek 4-shure!! Start with new fuel line check tank fuel filter ECT. From there move on to the engine.
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Old 06-26-2009, 11:45 PM
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it could also be a bad clutch or binding in the driveline causing it to run hot and bog
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Old 06-27-2009, 03:26 AM
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My vote would be the air leak is your best bet. Had the same problem found my gas cap was not closing tightly. Also my hsn had an air leak. Fixed both car took off like a bat out of hell. Held the tune and wont let it go.
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Old 06-27-2009, 10:29 AM
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wow so it sounds like i have an air leak, how exactly do i go about checking for one?
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Old 06-27-2009, 11:38 AM
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Originally Posted by heeltoedrver View Post
wow so it sounds like i have an air leak, how exactly do i go about checking for one?
I would start with the fuel line. Sometimes it doesn't seal around the nipple tight enough and my pressure line is awfully close to the fly wheel and one time put a hole in it (fixed that dumb shit).

The carb intake screw that holds the carb housing on gives me problems sometimes. The glow plug might not be tight enough, the cooling head might not be tight enough.

If it;s the fuel tank, i would take the fuel filter off plug or cap one of the holes submerge the whole tank under water with one fuel line attached and comming out of the water. Blow hard and you will know if you have a leak.

Oh and believe it or not i just installed a losi re11 and the nipple was full of grease and i could not figure out why the hell i was not getting gas to the engine. Troubleshooted for about 1 hour. COme to find out the damn pressure nipple on my pipe was clogged with greese!!! Came from the factory like that. had to spray it out with brake cleaner

replace the fuel line, tighten screws and go from there. Also on the cooling head use the right order to tighten the screws. I used to do boilermaker work and if you dont use the right sequence the head gasket will deffinitley suck air.

Check your gaskets on your muffler tooo.
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Old 06-27-2009, 12:31 PM
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well after returning all to stock settings and going over all screws, she seems to run just fine. thanks for the suggestions fellas
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