I've put on this head on my mx a month ago and (maybe it's just in my head)I think it knoks on idle!Maybe it's because I havent heard the engine 4 a while but!!!!!!!!What do you guys think?The engine as only 1500miles on.How do you guys like the head?Well in about 6 months it's gonna be time againe.Thanks in advance Tommy.

I cant say enough about mine. This thing rocks. You might want to drain the tank and put 92 or 93 octane in and see if that fixes it, sounds like an octane ping maybe. cross your fingers nothing came loose inside. I have had many combos with this head and havent had any problems so far.

Thanks speed,I was thinking the same thing, the gas in there is a good 3 months + old .Where you frome?

Ooops,just saw it Sterling Il.

Doubt if its ping at idle, probably piston slap, let it idle and than turn it off listen to see if the knock continues until motor stops dead. Piston slap if excessive will result in a hooked ring or piston skirt failure.

Bonzi, you are absolutely correct about the noise at idle not being octane related, but that is an easy place to start and maybe blk800 might get lucky and not have to tear it down. Also blk800 you might want to have your timming checked at the dealer, this would be the second place i would look, if the gas change and the timming check doesnt fix the problem you will have no choice but to open it up. Just my 2 sense. good luck and let us know what happens.

blk 800,

You have nothing to worry about. *The head does make a little more noise than the stock head at idle. *There are reasons for this. *The biggest culprit is the lack of support on the piston with only one ring. *We go through this with most every 800. *You should here the racket it makes when you replace just the rings. *You would swear the rod is coming through the case. *The reason for that is the new rings don't seat on the old piston. *After about 300 miles all is good. *Gotta love these new series III engines, they are famous for piston slap IE (knocking in the engine).

GLH

Thanks Damon, I was wondering if I should tear it down again!?saved me the headach and I'll sleep beter tonight.Thank you bonzi and speed also.

Hey blk 800, did you measure the squish band when all assembled,like with a piece of solder wire. probably is the bad gas from 3 moths ago,espesially if it's low test gas. http://www.snowmobileworld-s2.com/forums/iB_html/non-cgi/emoticons/smile.gif

Yep,waiting 4 Damon's fixe too.

Hey squish, no I did not check the squish yet,I'll try to get around that soon.

Bringing it back since people seem to be asking bout the 800 again.
Caleb

is this rk tech head good for 600 twins?? *ive heard about it being to lean in the mid range. *is that true? *are these heads good for trail riding, or only for the lake?

I have one on my wife's 600 DLX. Nice impovement I didn't take time to rejet and the sled was noticably faster. I have to change the clutching because it pulls right through the stock set-up. Will do the rest of the tuning this fall. ronzx9.