Thumper Club Forum
Technical => Bike Problems/Questions => Topic started by: rocker on June 27, 2009, 09:29:34 PM
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OS pipes first - had a fitting today _ if your going to OS Pipes be prepared to roll your sleeves up - it's a hands on experience. Collets made to measure in workshop although standard should suffice, I supplied standard flanges, but as previous, flanges were available on site. Pipes are single sheath stainless. A little backfiring after 140 miles (trip home to London [through a 30 mile lightning and hail storm [M1] and zero visability - still, open face helmet et all, I was able to squint at the white
hard-shoulder line and stayed in lane, just) so will check that further. OS Pipes very helpfull and enthusiastic. Bike loves the new pipes and retains the 2 into 2 as it should be. I was there for about five hours as pipes were fitted then removed for adjustments, then refitted, then removed for adjustments... Pea shooter silencers (already on bike) fitted with clamps supplied by OS. Bloke loves bikes and talking bikes, oh and the occassional Smoke - maybe that's why it took five hours! I, unfortunately, am new to biking and am a novice, but learning fast!
Only downside, the rattling I thought was the wasted downpipes seems now to possibly be the cam chain. Intermittent rattle at low revs, but seems to ease over 2000. Automatic tension adjust outlet (disc and raised bar) seems frozen either direction. Looking for info if anyone who has had a similar experience - easy to remedy? Thanks for previous responses.
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Only downside, the rattling I thought was the wasted downpipes seems now to possibly be the cam chain. Intermittent rattle at low revs, but seems to ease over 2000. Automatic tension adjust outlet (disc and raised bar) seems frozen either direction. Looking for info if anyone who has had a similar experience - easy to remedy? Thanks for previous responses.
The disc & bar bit is locked in place by an allen key on the head - it's basically the central spindle for the tensioner lock, which is a miniature starter clutch device (eccentric cams around the spindle, free spinning one way, locked the other). Edited to add picture showing tensioner & locking bolt (bottom left):
(http://i47.photobucket.com/albums/f159/KirriePete/100_1680Large.jpg)
I had similar noises from Arfur, rattle at tickover which disappeared further up the rev range. Turns out it was a badly worn cam & rocker (left hand exhaust), chain & tensioner in fine condition. I'm afraid you'll probably have to lift the rocker cover to find out what the problem is, not a difficult job just a bit of a fiddle getting to some of the bolts (the one immediately aft of the head steady mounting has bugger all room between it and the frame).
Arfur's cam & rockers turned up Friday, full-on fettling session yesterday afternoon saw the engine rebuilt - started on the 3rd kick with no rattles .......... I think - it's difficult to tell as I'm waiting on Predator getting my 'zorst up here, so it was running on old rusty downpipes with no baffling at all - rather fruity! ;D
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Those are the bigger bore downpipes, any loss of midrange power?
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Is the photo in this thread of an XBR head?
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Looks like it to me, but hopefully someone on here can confirm for definite.
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Yes thats an xbr head :) It looks like you may have to change the auto adjuster, you should be able to turn it clockwise and it should lock the other way, if that has broken it could well be causing the cam chain rattle, Funnily enough im working on mine at the moment as its stuck in the head and Im having difficulty removing it, should pull out easily a pair of locking grips on it, pull and turn at the same time and it should come out
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As that is Kirrie Pete's image and words that'll be his old XBR. No longer on singles, but still seen about the place and we have the occasional blether.
Toodle pip, Bill