| Welcome to CCM MaD. We hope you enjoy your visit. If it's your first time here please make your first post in either the 'Welcome' or 'Chat' section so we can verify your account quicker, untill verified your posts will need to be manually approved before they show, please be patient. Join our community! If you're already a member please log in to access all of our features: |
| 604 valve clearance adjustments; adjusting clearance | |
|---|---|
| Tweet Topic Started: May 22 2012, 06:38 PM (1,585 Views) | |
| richyrich | May 22 2012, 06:38 PM Post #1 |
|
Commoner
![]() ![]() ![]()
|
just enquiring if anyone can give some basics for checking valve clearances on 604 sm. i know its basic stuff- if you've done it before. i have the engine manual which gives gap sizes. also i have a haynes manual for a virago!! so i can maybe figure it out- just wondered what i have to get showing through the round window (sounds like playschool) , etc, etc. so that the valves are in correct position. a few tips appreciated, thanks
|
![]() |
|
| richyrich | May 22 2012, 07:09 PM Post #2 |
|
Commoner
![]() ![]() ![]()
|
in answer to my own post, found some good info on dansmc.com/valveclearence.htm |
![]() |
|
| Monty | May 23 2012, 08:40 AM Post #3 |
![]()
Charlie Big Banana's
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
I personally set them to 4 and 6 thou, though manual says 2 in and 2 out Always worked fine for me. |
|
If it aint sharp I can play with it My Utube Channel, lots of bike vids here. Subscribe if you likehttp://www.youtube.com/user/choppermark?feature=watch
| |
![]() |
|
| richyrich | May 23 2012, 03:03 PM Post #4 |
|
Commoner
![]() ![]() ![]()
|
rotax manual i have says 0.05mm for both intakes and exhaust i managed to get them set, dansmc.com is good for telling how to get top dead centre, etc. thanks |
![]() |
|
| bighit | May 23 2012, 05:12 PM Post #5 |
|
outta here
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
id go with monty . 2 thou is way too tight . a page from a news paper is roughly 3 thou. lowest we go with any engine at work is 6 thou even if they state 4 thou in the auto data books too tight and you will get a burnt valve and seat as they will not close properly when the engine is hot |
![]() |
|
| Monty | May 23 2012, 07:13 PM Post #6 |
![]()
Charlie Big Banana's
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
0.05mm is 2 thou :D 4 and 6 thou has worked well on many engines, 2 thou is a bit tight, I would rather hear a slight tapping than none at all, too tight is worse than too loose |
|
If it aint sharp I can play with it My Utube Channel, lots of bike vids here. Subscribe if you likehttp://www.youtube.com/user/choppermark?feature=watch
| |
![]() |
|
| bighit | May 23 2012, 09:10 PM Post #7 |
|
outta here
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
iwas told its when it stops tapping you should worry lol |
![]() |
|
| richyrich | May 23 2012, 09:53 PM Post #8 |
|
Commoner
![]() ![]() ![]()
|
it did seem a bit tight, not that i have done them before!!
|
![]() |
|
| richyrich | May 23 2012, 10:11 PM Post #9 |
|
Commoner
![]() ![]() ![]()
|
just read on motorcycleproject.com some info that says its a popular misconception that valve clearance is to compensate for heat expansion. it says this was due to early days of pushrod engines where the valves expanded more than the casings. it says that on ohc engines that with heat the clearance increases. no criticism on this matter please- i have just read it, and i'm no mechanic!!! just stating what i read.
|
![]() |
|
| richyrich | May 23 2012, 10:18 PM Post #10 |
|
Commoner
![]() ![]() ![]()
|
<_< |
![]() |
|
| bighit | May 23 2012, 10:25 PM Post #11 |
|
outta here
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
not doubting what you read but in the autodata books we use at work (im an engine reconditioner by the way) they sometimes give you a setting in say the 2006 book but its different in the 2008 book and still the same engine code ,so the engine makers must have decided that the clearance was wrong the first time . more often than not they widen the clearance rather than tighten it . most engines are an average 8 inlet 16 exhaust -+ 2 thou either side of them values( thats cars by the way not bikes ) . then you get the vauxhalls that are 20thou inlet and exhaust . then you get some that are set when the engine is stone cold and some that are set when the engine is warm end of the day ,the engine makers spend tens of thousands designing the engine and a guy on the internet then says he is wrong lol who is right ? i dont know |
![]() |
|
| richyrich | May 24 2012, 07:56 PM Post #12 |
|
Commoner
![]() ![]() ![]()
|
thanks for feedback, it's all new stuff to me. one thing with buying a ccm - i am learning more about engines and carbs than i did before!!
|
![]() |
|
| richyrich | May 24 2012, 09:26 PM Post #13 |
|
Commoner
![]() ![]() ![]()
|
whilst i'm on with the valve clearances- i noticed that the covers that are on the ends of the arms- not sure what they are called- look a bit like airgun pellets is best description- well they look a bit loose/worn- should these be replaced? thanks
|
![]() |
|
| bighit | May 24 2012, 09:29 PM Post #14 |
|
outta here
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
what bits ?
|
![]() |
|
| richyrich | May 24 2012, 09:53 PM Post #15 |
|
Commoner
![]() ![]() ![]()
|
i just been looking at diagram before you posted it. i think they are on caps on bottom of adjusting nuts? look like come already fitted as part of screw. just on my bike one or two of them look bit loose! |
![]() |
|
| Monty | May 24 2012, 10:07 PM Post #16 |
![]()
Charlie Big Banana's
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
Thats fine mate, most engines the end of the screw touches the top of the valve, the rotax goes one better and fitted a slipper (for want of a better word) they flop about so no worries its normal |
|
If it aint sharp I can play with it My Utube Channel, lots of bike vids here. Subscribe if you likehttp://www.youtube.com/user/choppermark?feature=watch
| |
![]() |
|
| bighit | May 25 2012, 04:32 PM Post #17 |
|
outta here
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
are they like this ![]() the white plastic bit? we call them elephants feet( its a ball end on the adjuster and the metal bit inside the plastic bit that touches the valve stem has a socket like an elephants foot does ). thats a Mitsubishi L200 rocker arm you can only buy the bottom bit for the L200 with the screw adjuster built in , so as monty says your ones will be fine as they are meant to move . causes less wear on the end of the valve stem |
![]() |
|
| richyrich | May 25 2012, 09:31 PM Post #18 |
|
Commoner
![]() ![]() ![]()
|
yes, thanks to you lot for advice. good job i checked on here! went to see local mechanic today and he said same regarding clearances. i have re done them, used my metric gauge and put digital verniers to convert into imperial. nearest i could get on my metric was a 5 and a 7. i probably was a bit overcautious and done them a bit loose- they are a bit noisy so will prob have to redo. on plus side- bike starts with no throttle and is accelerating smoother than it has before ( helps with 45 pilot i put in as well). off for mot tomorrow so hopefully it ok
|
![]() |
|
| bighit | May 26 2012, 06:26 PM Post #19 |
|
outta here
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
verniers are called verynears in engineering places , not as acurate as a micrometer but they are pricey . get a set of draper feelers for a few quid and they come either metric or metric/imperial (both on the feelers ) or get the motion pro ![]() a few quid each but handy for doing the adjusters on the 644ds . tip. bend the first half inch of your feeeler blades to 90 or so degrees . if you keep them straight and use one that is fairly thick you can push the valve down a little giving a false clearance . also clean oil off shims and followers if doing a shimmed head as a little oil will give a false clearance also as the oil is thick . you get them type tappets on most car heads and some bikes also
|
![]() |
|
| « Previous Topic · Chat · Next Topic » |





![]](http://z2.ifrm.com/static/1/pip_r.png)






as a little oil will give a false clearance also as the oil is thick . you get them type tappets on most car heads and some bikes also

8:47 AM Jul 11