Quote:
Originally Posted by polex
... The previous owner have made modifications (carbs and high performance camshafts)...I posted 2 photo on my album about carburetors and diaphragm.
http://www.triumphrat.net/memberalbu...7948&protype=1
The bad carburetor is on the right side, the corresponding diaphragm is on the left; it is damaged but not perforated.
I think about close valve clearance because a back fire can justify the diaphragm status and the black stain on the carburetor. |
OK... Now the camshaft issue makes sense. You're correct that if the cam clearance is too tight that it can cause backfires through the carbs.
That can also be caused by a little dirt, lint or corrosion on the valve or valve seat, so checking the valve clearance is a good first move.
The bad diaphragm definately looks fried and backfire would account for that.
Quote:
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Mainly I don't need to remove completely the camshaft for removing the shims, I can loose it and lift a little bit just for changing the shims. Can I do that without removing the side cover ?
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The cams have to be rotated so that the base circle of the cam is facing the shim, but if you loosen the cam chain to loosen the cams you will not be able to rotate them using the hex nut on the end of the crankshaft.
The way most folks do it without the Triumph tool is to measure all the clearances, write them down, and then lift the cams to change the shims.
You will need a torque wrench to tighten the cams down again and the tightening has to be done in sequence or the cams won't tighten properly.
You'll also need to remove the cam chain tensioner and reset it before you reassemble the cams. Be sure to get a replacement gasket for that and the front right cover.
Jim
