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R Wont start after Piston Installation
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Posted by: xxsupra02xx

We have recently Installed a 13:5.1 Wiseco Piston in our Honda 450R, When we rebuilt the engine we followed all the torque specs and used all the seals & installed them correctly. We are now running Cam2 (purple 110oc. Race fuel). When the bike is kicked it will not start, It backfires on occasion but wont start. The only suspicions we have are 1. The crank is out of time 2. The plug is bad & 3. The Jetting needs adjusted. If anyone has had a similar expierience please post .. So we dont have to spend days trying to solve this problem

Posted by: jeepnrocks

sounds like you cam is 180 degrees out.
the plug is easy enough to check and if your jetting is way off chances are it would still at least start up.
you probably had the piston at top dead center on the intake stroke instead of the combustion stroke.

Posted by: Ralph

also sometimes it helps going over the valve lash once more. i had similar situation and when i broke it down again it turned out that the timing was fine but i readjusted the valve lash and it started right up.

Posted by: WhiteZee

the first thing i would do is lean out your air/fuel screw. with the added compression, you should be running really rich if your using your old jeting.

Posted by: desratt

did you retard your cam?
with that high a comp piston and a wild cam. you probably need to. I made the mistake of not and my piston hit a couple valves. I would double check with the cam company.

also is it harder to kick over? it should be.

Posted by: Doibugu2

Check your valves.

If it was your jetting it still should start.

Good spark and fuel?

Posted by: asdf450r

drain some fuel from the bowl, mine wouldnt start either after it sat for the cam installation for about 2 weeks. drained all the old gas out of the bowl and it fired up fine.