it is awesome as the rc guy now gets nice stuff at good prices ...unless there quality goes down .....

Does anyone know which type of Fiorini/OT cooling head (if any) will fit on the .21 mill? I don't particularly care for the bland silver one that comes with the non-tuned version.

All,

I am running the GRP modified, and it runs great, but after revving and returning to idle, the idle starts increasing steadily, and keeps increasing until it is very high. Revving the engine about half throttle calms the idle down again briefly, but then it starts rising again.

I have tried tuning both needles (both ways) and the same with the idle screw, and cannot get rid of this problem. Richening the low end seems to work the best, but then the low end is too rich. (Note I always warm up the engine before trying to adjust any of the needles).

Any help is appreciated.

Thank you in advance.

Jonro ..did you get the bearing race out,and how??

sounds like it could be a air leak, try sealing everything with some air seal. carb, backplate, pinch bolt.

Is your throttle linkage pulling the slide open slightly? Pull off air filter and go from full throttle to brake and release.

I don't think anything is binding or rubbing, but I will check. My guess was an air leak too. I have already ordered some sealant. I will let everyone know how it turns out.

Thanks guys.

Make sure its not sucking air through the front bearing.Take the fly wheel off and spray some soapy water on the front bearing and spin the crank back and fourth. if you have bubble blowing up it has a air leak.Another racer showed me this trick and i found my air leak.

nice trick there ...and also it sounds like an airleak ....

Have any of you guys used a different carb on a GRP. My carb is broken but I have OS, Novarossi, and a Vega carb will the motor run with a different carb. Thanks

Nah lol tried everything but it wouldent budge, so i just dumped it on my engine modder as he was going to be replacing the bearings and modding the engine anyway, he said it wouldn't a problem to get out, with the tools hes got.

Just got the engine back a couple of days ago and everything looks good, about give it a run now.

Zixxer,

What did you do to fix the air leak ... replace the bearing?

hey buddy didnt have an airleakbut the trick about the saopy water around the bearing and watching for bubbles is good ...and if you did get bubbles i would say that would be what you would do ....

Sorry zixxer, I meant to address my question to white48rc ...

Make a long story short I had to replace the block and bearing.