Hi Phil
I just removed my primary belt drive and pulleys today and installed Andy Chain's IWIS dupplex primary chain onto triplex sprockets. I took some photos of the process which I will post in due course, but for now a quick "How To" for you to change out your primary chain.
oh, and for those who don't like primary belt drives, this old style white belt has roughly 12,000 kms on it, and the belt and pulleys are still perfect, with the white belt now stained a brownish colour from all that time running in hot oil..... Photos to follow.
So:
1. drain oil, 17 mm wrench to remove drain plug
2. remove any obstruction to primary case removal - in my case, shift lever on the crossover conversion needed to come off. If still left side brake, remove pedal if it obstructs primary case
3. remove the primary chain tensioner, complete - remove cap nut, remove lock nut (both 17 mm wrench) unscrew adjuster with stubby straight screwdriver, which will drain the primary case
4. remove the nine primary case cover bolts (note that the front two are shorter, make sure the short bolts go back in the correct locations)
5. break the primary cover loose DO NOT PRY. I use a rubber mallet, some turn the bike over on the starter motor. The case has to come straight out, what it hangs up on are the two needle bearings in the case, so don't get rough with it
6. from inside the primary cover, remove the tensioner shoe and the mounting pin. Clean up inside the cover, get rid of the dirty oil, check the needle bearings, check the condition of the rubber face on the tensioner.
7. on the crankshaft end, remove the 32 mm nut with a proper snug fitting 32 mm socket. I use an air impact gun so I don't have to dick around with jamming something between the crank gear and the clutch gear to stop the crank turning. This 32 mm nut is normal right hand thread.
8. remove the eight bolts on the clutch housing using a 10 mm socket or wrench. Remove the round metal plate the eight bolts were holding on.
9. wriggle both the front sprocket and rear sprocket off together, with chain still in place. It comes off as a unit.
10. check the condition of the rubber isolator bushes on the clutch drum, replace if necessary.
11. clean up the threads on the crank end with a wire brush or similar.
12. Put the new chain on both front and rear sprockets, offer them up to the clutch drum and crank end as a unit, slide both sprockets into place. On crank end, install the tabbed washer and 32 mm nut, on clutch drum replace thin plate and the eight bolts Tighten to spec.
13. If necessary, install new primary cover gasket. Install tensioner mount pin inside primary cover, install tensioner shoe and spring clip onto pin, offer up entire primary cover, carefully, onto the shaft ends, work into place, once sure square onto shaft ends, tap into place with rubber mallet
14. re-install the primary cover bolts, remember where the two short bolts go. Re-install the tensioner screw - turn in with a short flat balde screwdriver until chain tension is felt, then back off about a half turn, install copper O ring, lock nut, then cap nut.
15.add oil, re-install shift lever or brake lever if removed, test ride, and adjust primary chain tensioner with engine running....
DONE - my time (having done this dozens of times before, using an air impact, and with the bike on a lift table at a convenient working height) - twenty minutes, start to finish. Your time, first time, and blocking crankshaft sprocket to undo the 32 mm nut, give yourself a couple of hours.
MATERIALS REQUIRED
oil, primary cover gasket, primary chain - possibly chain tensioner shoe and possibly clutch drum isolator rubbers
TOOLS REQUIRED
17 mm wrench, 32 mm socket, air impact or means of blocking crankshaft sprocket, 10 mm socket or wrench to remove cluch cover bolts, whatever you need to remove the 9 primary case bolts (mine are stainless steel allan heads), rubber mallet, stubby straight blade screwdriver.
ANDY - the IWIS duplex is a perfect fit for a primary chain, not too tight but so snug there is no slack at all, I fitted to the two inside sprocket teeth, the chain looks really substantial, thanks.
Paul LeClair
,how often should they be changed ,i've owned the bike for 5 years with only occasional adjustment,also looking at a certain dealers parts list i see that there two types to choose from,triplex or two singles,which is recommended by you guys?....i realise this may seem basic stuff to be asking but we all gotta start somewhere....any advice will be greatfully eaten.
