XR/CRF80 adjust cam chain?
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From: Whelan - '02 200exc (x2) & '04 MTD 38 on 4 Jun 2007 09:55 Hi everybody!! My buddy has a CRF80 & the owner's manual doesn't say how to adjust the cam chain. How do you do so? TIA! -JD
From: JayC on 4 Jun 2007 12:17 On Jun 4, 9:55 am, "Whelan - '02 200exc (x2) & '04 MTD 38" <y...(a)sisna.com> wrote: > Hi everybody!! > > My buddy has a CRF80 & the owner's manual doesn't say how to adjust > the cam chain. > > How do you do so? I did a search and found this on another forum - no personal claim to accuracy - JayC "If you take the stator cover off you can see the base of the cam chain slipper on the right of the crank. You can also see the adjustment bolt, where it connects. If it is worn beyond what the spring will set it, you can reach in there with a screwdriver and pry some more adjustment out of it and retighten the adjuster bolt."
From: JayC on 4 Jun 2007 12:18 Almost forgot - the above quote might be regarding an XR200, but I think they are all basically the same. JayC
From: Tiago Rocha on 4 Jun 2007 12:20 On 4 jun, 13:17, JayC <j...(a)sysmatrix.net> wrote: > On Jun 4, 9:55 am, "Whelan - '02 200exc (x2) & '04 MTD 38" > > <y...(a)sisna.com> wrote: > > Hi everybody!! > > > My buddy has a CRF80 & the owner's manual doesn't say how to adjust > > the cam chain. > > > How do you do so? > > I did a search and found this on another forum - no personal claim to > accuracy - JayC > > "If you take the stator cover off you can see the base of the cam > chain slipper on the right of the crank. > You can also see the adjustment bolt, where it connects. > If it is worn beyond what the spring will set it, you can reach in > there with a screwdriver and pry some more adjustment out of it and > retighten the adjuster bolt." This in regard to adjust chain slack, right? If it is to set chain timing, most bikes have a mark on the gear that is attached to the cam on the head of the engine. Put the lobes "up" while aligning the mark with the engine carcass (head cover). Then align it with the "T" (it is a laid down "T" :-) which is stamped on the magneto and I am not sure about the 80cc XRs, but on all others there are two screws (some allen, some slot), one big, where it allows you to rotate magneto and other small, where the laid down "T" will show. A lantern might be handy to spot the "T'. Oh, btw, if you have to turn the magneto, do it clock-wise... And don't forget to set the lobes "up"... -- Tiago
From: Whelan - '02 200exc (x2) & '04 MTD 38 on 4 Jun 2007 13:30
Jay & Tiago, Thanks but the bike's almost brand new (so I'm sure there's plenty of adjustment left) and he's not trying to check the timing, just do the break-in service and get rid of any slack. There's a lock nut on a stud poking out of the case behind the cylinder that I seem to recall from my XR100/XR200 days is used to release the slack adjuster to take the slack out then lock it but I can't recall the details on how to do this. -Joe |