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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
minor piston siezure cause?
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[QUOTE="spanky250, post: 155195, member: 20897"] Perhaps the main is not your problem. Have you tried the smaller main with the needle clip lowered one notch to richen the middle a little? Most riding is done from 1/4 to 3/4 throttle, you don't ride wide open around the entire track. There are also other factors that influence the plug color, the chief one being heat range. I only use plug color as a reference for the main jet, it is useless as a diagnostic for the other carb circuits. As for the pre-mix ratio, I suggested 26:1 simply because I would not run less oil than that in a small-bore engine, because they have to be revved so high to make any power. The pre-mix has a small influence on the jetting, but it is more fine-tuning, not nearly like changing jet sizes. Try the 135 main with 26:1 ratio, and see how it runs. If it seems rich, you need to determine if it is actually the main that is off, or if it is the needle. To properly do a plug reading for the main jet, warm the bike to full operating temperature, change the plug, and do a full-throttle run through the gears without letting off. As soon as the bike tops out in top gear, pull the clutch in, kill the engine, and coast to a stop. Remove the plug and check it all the way down at the bottom of the insulator. This area is hard to see without removing the threaded portion of the plug, but it is the only accurate way to do it. If the plug color looks good after this test, then the main is ok, so you need to be looking at the needle. If the bike doesn't run cleanly with the 135, then go to the 132 and raise the needle one notch (lower the clip) to see if this cures your problem. Rebuilding with a Wiseco can be a source of problems if the clearances are too tight, a forged piston runs slightly larger tolerances than a cast piston. If the cylinder was bored and replated to stock clearances for a stock cast piston, there is a good chance that the bore is simply too tight for the Wiseco. If this is the case, send it back to the place that did the cylinder job and have them replate it to the proper clearance for the Wiseco. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
minor piston siezure cause?
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