I was pointed to this section of the forum, hopefully someone here might shine some light on my questions.
So i've got this Yoshimura Yr2-31 Cam aka "Daytona" for a cb500 k1. One thing i noticed while timing the cam is that the inlet valve is begining to open at 49-50 btdc, Thats where the cam card says ill want ignition. My question is. if the valve is closing at 49 and the ignition occurs at 50 does this do any damage to the engine or just a powerloss?
The only information i found about this cam is from the 750 version of the cam, Some information such as clearances i assume to be the same. the 750 only wants 3degrees more advance. I dont know the stock cb500 advance but i think its around 30tdc thats why 50 sounds like adding around alot with 20 degrees. I dont know much about the 750 since ive never owned or read about how they perform.
Previous owner told me that i was supposed to set the ignition to a fixed 50 degrees, locking it with a washer below in the blurry image, (sorry). It was in a bag marked "For the timing advancer" im not sure if this is something that followed the cam or was made by himself. He Has had a hard time remembering since it has just been sitting still in his garage since early 80's. Does this sound weird in your ears? He also told me that It cannot be started with the electric starter when the cam is in and you need to kick it? This might have something with putting the ignition at 50tdc static? I've been told old motorcycles with high/low ignition shouldnt be started in the "high" mode else they can kick your leg off
Engine is fitted with Yoshimura 550 high comp pistons marked pop, got some porting aswell (atleast the rouch casting surfaces have been removed my novice eyes can see). using the recommended valve springs. rest is stock more or less.