When putting in new P/s/r in these motors at what measurement do u just say its not worth it cause to much wear on crank pin ? What are the specs on a new crank pin ? thanks

Underhead On-Road Ø37,8mm
can someone kind enough tell me what are the 37 and 8mm? thanks!

It's the diameter of 37.8 mm or 1.4881889 inches

thanks stefan. this data was copied from the turbo head of my jp r03, i just wonder what is it differed from the normal underhead without these 37 and 8mm?

what is the difference between the long body turbo glow plug and the short?

What do you mean long or short? Here is the list of on-road plugs:

http://www.novarossi.it/eng/products...php?plug=ctuon

For .21 engines, I like the C8TGH. I use it all the time.

sorry i ment the long body and the short body, also now that i looked at the chart what is the difference between c8tgh and c8tgf?

Anyone has experienced that when tune the engine near peak power then everything is fine for few tanks. After a long rest, the engine will be richen and bugging in low rpm, then give it fulll throttle for a while, it will be fine. Then it keeps richen alittle itself in the same tank.

I read from the new plug. The plug is shiny, little bit wet around, but the surrounding is black.

Any best way to tune this engine?

I think your engine needs to be broken in more.

May be, but it ran already 10+L fuel.

- check the bearings
- try a different brand glowplug
- check you exhaust system, change the pipe (a loose conus can cause this)
- try a different tank

Try change the head to the old flash head..i've heard from some of my local guys that the new head is sitting too low and might affect the tuning..even in the recent worlds,robert was using the old head in the finals..can give it a try..

oic. Yes, the cooling performance is very good, but too cool. May be its a problem.

Hi All, can anyone tell me the diameter of the crank pin on a Nova 3SCT Tuned.

Cheers

4.26 mm