hey I have a 1986 tomos bullet and lately it has had like no power. And after about 2 hours it gets worse. It has very good compression and it has good spark. I also checked and cleaned the carborator & jets. The exhaust is clean so I know that can't be it. Also how do I adjust the timing?
"Timing can be adjusted by rotating the ignition base plate.<br>Check the air filter and spark plug. More info at http://www.members.tripod.com/twowheelers/TOMOS.html, Tech corner/Troubleshooting section.<br>"
"Yo, Twowheelers, I know that I can move the plate but how do how do I know that its at the right setting. I looked and I couldn't find any markings. <br>"
"Well, if you don't know the original position (although there should be a mark on the plate and the crankcase), it's gonna be a tough one. Factory ignition advance is 1.5 mm (+0.2 mm) and the correct way to measure it is by a dial gauge with a gauge pin and a special accessory part which is screwed into the spark plug hole. So when the piston reaches 1.5 mm TDC, there should be the contact (which is determined by Ohm meter). If you don't have all this stuff, test driving and rotating the plate is all you can do. If it accelerates fast and doesn't have much top speed, rotate the plate counterclockwise and vice-versa.<p>"
<HTML>I had the same problem with my tomos lx. If your exhaust pipe is old you can't tell that it is dirty in those bends under the engine. Start the engine and feel the exhaust flow out the back of the muffler. If it is weak then replace the muffler with a better one, especially if it is the stock muffler. My loss of power also was most pronounced when the engine was warm. I put the new muffler on and was amazed.</HTML>
<HTML>Resons for loss of power.
Since the problem is a progressive one (ie as time passes while it is running) it could be a few things.
1.) Your piston and cylinder are worn. This would not be evident at the start of the engine, since everything is basicly not heated and expanded. However, as time passes things heat, and expand. The "oil" in the mixture would also keep the seal between rings piston and cylinder tight, until it heated up and of course thined with the heat...causing compression break down.
2.) Bad Spark Plug. Which when heated can loose power.
3.) Poor fuel to oil mixture. Make certian it's the correct mixture for the engine.
Hope it helps!!
Ryan </HTML>
<HTML>Moped parts - service manuals - service tips available from http://sportsbay.com.Puch-Motobecane-Sachs-Garelli-Honda and more</HTML>
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