Hi guys need to know. If I could run a (stock).
Novarossi on 30% with out shiming the head.

they are shimed already, but i have always ran 30 without adding a shim and had no problems, it uselly will help prolong the life of the motor and help reduce temps. i would get a second appinion though.

Thanks alot mugenb46

what motor do you have?

Rs12s2

ya i would run it stock shimming. but if you want to ad shims start off with one or two .001 shims.just keep an eye on the piston dome. if you see pitting or it starts to look pitted then add a shim or two. this is what detanating is. you can also check your deck hight and post it on here and someone can tell you if your close or not, but i think you will be fine with 30 and stock shimming. good luck,have fun

hey all..

this is what happend to my engine last saturday
any idea? should i go for a new engine? has anyone suffer the same damage?

br
antony

Damm......

I think the crankshaft is bent, and thus vibrate.

Need to replace the front and inside bearing.

I suggest to buy new engine because the cost to rebuild probably is half the price of new engine.

some weeks ago i replaced the inner ball bearing.. it was destroyed, i also think that the crankshaft has been destroyed that time and now just broke.. but the bearing at least the inner one seem to be good.. also i am lucky enough and pieces of the broken iron didn't scratch the piston the main problem is that even if i change the crankshaft i am not sure if the engine will work ok. i have run about 6ltrs of fuel. how often should someone change the rod?

I suggest buy new engine.

Change conrod every 2 gallons and/or everytime you replace p/s/r

Next time when you put the flywheel, always use proper tools. You tighten the flywheel locknut hard enough but not too hard. Use oil lubricants to collette, flywheel, and flywheel locknut's threads. The lubricants aid the tightening process. It won't slip during use, trust me !!

what do you mean p/s/r ?

can you explain me a bit more what you mean about locking the flywheel? i should use some oil while tightening the flywheel nut?

p/s/r = piston, sleeve and rod

regarding the bearing change, you may installed the bearing with bad alignment with the front bearing, causing some bind on the shaft.....

there's a tool to install bearing properly aligned with each other.......try to get one of find a hobby shop to make this service for you next time......

ok this is a problem, i didn't know this i though that the bearing just sits inside the engine and the alignment is correct because the bearing "case" was tight.. i suppose this was wrong

Just to mention to anybody who wants to change main bearing on Novarossi based motors-be carefull, Novarossi main bearings made offset and proper direction is required. Shorter side goes to back side of motor.
It is just tip to follow.

this is something new to learn although i have changed my main bearing i didn't know this.. when you say shorter side you mean for the inner "circle" of the bearing or the outside?