Has anyone heard about the1/4 turn out on valves

No. It will be 1/6 or 1/8 depending on the thread pitch of the tappet adjuster screw. 1/6th should work fine.

pollo said:

Just wondering if anyone has heard of this method. Iv'e done them this way because my dealer advised it. I just did them at 1/6th out because thats alot of what ive hearing about them. It seems to run great and the idle went a little lower as expected. Seems a little less noisy also in the valve area as expected. Could it be that the 1/4 turn out is the advice for the 05 version?
Pollo

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1/4 turn would leave loose clearances, which explains why it is less noisy. Loose exhaust valves also cause the auto decomp. assembly to not function properly, which makes the engine hard to turn over either on the e-start or kick.

I know the thread pitch changed at some time, but it was before '05.

RE: Re: Has anyone heard about the1/4 turn out on valves

we had this conversation but two days ago about exhaust valves that blacken and may not be seating properly?

if we are still on the .7mm pitch then 1/6th turn back is correct for getting a 0.12mm tappet clearance.

but as i said, the valve seats are always black and sooty so why?

also if you have more than a few thou lateral clearance for the rocker in the top cover then there is the chance that a cupped pad is going to move wildly from correct to too tight in micro seconds.

the rocker needs to be correctly spaced left to right, pads must not be cupped and then you'll have consistancy.

new we have the later more modern cams we're close to opening the clearances to "what ever we want"! but we can't while we have these springs fitted! the conical springs have to be outed, dual springs fitted and THEN i would look at 1/4 turn - just for kicks!

any race cam that has shorter duration due to looser tappets will always idle better as there is less overlap and reversion of the incoming charge.

on my ducati pantah F2 to increase the tappet clearance by .1mm would change the opening timing by 5-8 degrees and the closing by 5-15 degrees.

i hope we talk about this subject soon.

regards

Taffy

So what would be a good setting for the 08? 1/4 or 1/6 ?

we think pollo has made a mistake. this is the first time 1/4 has been mentioned. don't get confused. don't start a rumour. it is and always been 1/6th turn. it couldn't be clearer.

if we experiment with looser tappets we'll let you know. but i've explained above why anything larger than 1/6th would damage the engine above. if you punch me from 1`" away it isn't going to hurt as much as if you took your fist right back. so the minimum gap is good.

regards

Taffy

If the valve clearance is too little the heat from the valves will not have time to be transmitted over to the cylinder head. That will result in overheated valves and valve and valveseat damages. That is why the valve clearence is so important.