Shakes after I put a pipe on.

[fastgtp99]

Yesterday I put a pipe on and now it vibrates the seat and floor really bad when I accelerate until I reach max speed and it also sounds like a clattering noise like something it grinding together. Its not a bad clattering noise but its feels like the motor is pushing to hard. I went from a completly hollowed out stock pipe that was to loud and didnt give the motor the back pressure that it needed to a technigas that i borrowed from a friend. I checked the side to side clearance of the crank to see if the bearings were bad and it seems to be fine, any ideas?

[adark248]

Its not a bad clattering noise but its feels like the motor is pushing to hard. I went from a completly hollowed out stock pipe that was to loud and didnt give the motor the back pressure that it needed to a technigas that i borrowed from a friend.

Sorry if I'm misunderstanding, but you used to have the hollowed out pipe w/o back pressure and a new one is making the clattering noise?

If so, maybe as simple as loose carbon build up in the pipe? Have you decarbonized it with lye based cleaner or on a bonfire?

[wiguy05]

Did you rejet for that pipe? Could definitely be lean-surging.


(this is bad)

Please give us your FULL setup in detail to aid in tuning.

[fastgtp99]

yes I had a stock pipe on there but it was hollowed out, so it was just a can basically. it sounds like the motor is pushing to hard now and shake the whole bike. I have a bore kit, 8to1 gears, 28mm oko carb, all the goodies that you can get for the most part.

[wiguy05]

I have a bore kit, 8to1 gears, 28mm oko carb, all the goodies that you can get for the most part.

Main and pilot jet size? Roller weight?

[fastgtp99]

I have 8's and 10's in it right now and for the jet I have a 142 jet and the needle jet is the one it came with.

[Arnadanoob]

OKO 28mm carbs come with a 39 pilot jet I think, which is too small for your 72cc. That's one issue I can definitely point out.

The technigas pipe you're using now, is a chamber pipe? You're going to need a serious tuning session if you are using a chamber pipe. Those weights are completely too heavy for such an application (all assuming you are using a chamber pipe).