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Is their anyway of knowing what size the gasket at the flange is without taking it apart? Fyi my bike is a Jonway yy150t-12 150cc 157qmj if it helps


Solymar

It mostly pops, but their have been a couple loud ones.

I only changed the muffler and gasket at the muffler. I did not change the pipe from the engine to the muffler. Before the muffler change it wasn't making any noise.
The new mufflerr looks virtually identical to the old one...oem.

Was running lean prior to the muffler change. Spark plug gives that sign, looks white not toasted brown/tan colored as it should.

Before the original muffler went bad, I was gonna up-jet the carb from 112 to 115, but now with the new issue I was thinking I'd need to possibly go up 2 steps for the jet.

Could I still need to change the exhaust gasket at the motor?

Solymar

I should add the bike is a 150cc

Welcome

I bought my bike from them. I ordered the Roketa model 75 in yellow and I received exactly what the picture showed, only it isn't a Roketa, it's a Jonway. No real biggie and only difference seems to be some minor parts being different.

Overall the buying experience was easy and my bike showed pretty quickly. My biggest issue with SPS has been trying to get a hold of the parts dept. Of all the calls I've made to the parts dept, I've only ever been able to talk to someone around a 3rd of the time at best. Leaving a voice mail with my name/number and request has never yielded a call back. Using the online parts request form has been successful only 1 of 4 times.

Their parts are more expensive than most other online parts merchants. So unless it's under warranty, I'd search for the parts elsewhere.

As long as you do your own pdi as you said you were going to do, and do regular maintenance you should have a bike that will last you many seasons.

Solymar

I got lucky and figured it out. It was a bad petcock.

I spent the morning changing out the fuel and vacuum lines, replaced the spark plug, pulled the carb and sprayed carb cleaner thru everything and then adjusted carb without anything helping.

I tried pinching the vacuum line at the petcock and my rpms went way up (from 1500 to 3k ish). Pulled the vacuum line off and noticed a drop of gas again. I happened to have an extra petcock and decided to give it a try and it runs right again (lucky guess lol)

Thanks allyoop and cyborg for your help. I very much appreciate the help!

Solymar

I'll try that cyborg, thanks!