Timing/Cam Chain WR 400 replacement
Posted September 04, 2008 - 05:51 AM
Posted September 04, 2008 - 07:34 AM
Don't bother until you're at 50 maybe more...
If you need to know though:
yes to the flywheel, remove valve cover and you'll have to remove cams - mark the chain/gears on both cams AND at the crank, transfer marks to new chain - install new chain crank first lining up mark - when putting in cams hook under new chain while pointing both down and inwards - line up your marks and tilt/move/roll them into the seats simultaneously and all should be good. Tighten in star pattern NO MORE than specified torque.
Check your clearance while you've got the lid off
Posted September 04, 2008 - 09:07 AM
Posted September 04, 2008 - 09:55 AM
Oh, and it also helps because when you point the cam gears down/inwards to install them, it's really hard to figure out which cam gear will end up where, it's easier to see when you have a line on each whether they will meet up or not before they are lifted/rotated in place.
Posted September 04, 2008 - 02:20 PM
Posted September 05, 2008 - 03:57 AM
You can tell a lot more from your valve clearances - check the clearance, if it's on the tight side, remove the cams to see your shim size, ~184's are usually factory - if your bike has smaller values then they have been adjusted at least once before, at which point I would guess that a piston, rings, bore inspection/overhaul and valves/chain wouldn't be a bad idea in order to save yourself the possibility of a much more costly repair in the near future.
If a valve drops, you have to do the whole engine top to bottom (possibly even a new head - rework at a minimum)- I wouldn't even hesitate on that - the force of the hit has to go somewhere - usually the bottom end.
hotcams really don't make the job any more/less difficult. honestly - it's all pretty simple, as long as you follow the manual all will be good.
Posted September 06, 2008 - 04:36 PM
Posted September 08, 2008 - 07:50 AM
Anyone have a link to a manual cam chain tensioner for sale. Thuper dose not have one for a WR 400. and I Googled but can't find one.
They don't sell them because you don't need one.
The camchain will last as long as a piston and rings.