Timing, rockers and a bad day

robertdawber · Post by **robertdawber** » Sun Jul 26, 2015 3:26 pm

I changed the cam holder but kept the old rockers and cam. Now I cannot get # 1 intake to adjust to specs (timing) without the screw going all of the way in and the nut not able to stay on. I set and reset te timing marks, turned it over by hand and rechecked the timing.
I managed to start the bike and it backfired a ton and then died.
There is always the possibility I used the wrong cam-but ould that cause this?
Anyway, I would love some help.
Bob

RBGERSON · Post by **RBGERSON** » Sun Jul 26, 2015 7:39 pm

COULD BE WEAR PATTERN ISSUE on the cam holders with different cam...the two do wear together..and now yours haven't...???

robertdawber · Post by **robertdawber** » Sun Jul 26, 2015 9:08 pm

RBGERSON wrote:COULD BE WEAR PATTERN ISSUE on the cam holders with different cam...the two do wear together..and now yours haven't...???

Thank you for the reply!
That much though? Is that really possible? If so, should I put the other rockers and cam on that came with the holder?
What if I mixed up the cams and have the other came with my rockers?
Any other thoughts?
Bob

pixel288 · Post by **pixel288** » Sun Jul 26, 2015 10:40 pm

I have never pulled one of these apart, but in looking at a couple of pics, could you have forgotten the shell bearings? That would explain why the adjusters need to be so far 'out' , the cam itself is sitting and turning in the casting, not on bearings.

robertdawber · Post by **robertdawber** » Mon Jul 27, 2015 6:30 am

I didn't see any shell bearings?
I was wondering if the timing could be off 180 degrees-although I did secure the other side and have the timing mark lined up before I began.

pixel288 · Post by **pixel288** » Mon Jul 27, 2015 9:17 pm

180 off could account for the maximum backfire effect... on the other hand, is it possible that you have the cam switched end for end? Like I said, I've never pulled one of these down, but it seems to me that it's an assembly issue, or a totally wrong cam for the purpose. Are you sure the year/model is exactly the same on the replacement? Could a different year be a smaller diameter lobe with longer push rods? Just brainstorming here.... I've been there on other stuff, and it usually turns out to be incredibly simple when I was looking for complicated.

Phil

pixel288 · Post by **pixel288** » Mon Jul 27, 2015 9:18 pm

Just occured to me..... could you be using a left side cam with a right side head or vice-versa? That might account for it.

Phil

robertdawber · Post by **robertdawber** » Mon Jul 27, 2015 9:50 pm

pixel288 wrote:Just occured to me..... could you be using a left side cam with a right side head or vice-versa? That might account for it.
Thanks Phil.
The left and right are not interchangeable. The right side is longer and moves the tach and fuel pump.

Phil

pixel288 · Post by **pixel288** » Mon Jul 27, 2015 10:15 pm

I'm atryin!

Timing, rockers and a bad day

Timing, rockers and a bad day

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