Honda-SOHC

SOHC.co.uk Forums => CB750 => Topic started by: Robbo on September 19, 2012, 10:05:34 AM

Title: Timing
Post by: Robbo on September 19, 2012, 10:05:34 AM
Have really enjoyed riding my naked PRR around in the sunshine, although when I set the timing with a strobe 1-4 were perfect but 2-3 bounced all over the place. Points and condenser are both quite new. Not sure what else could cause it, although 2-3 coil is a new aftermarket one which is a little smaller than the original, could this be the problem?

It pops when cold, usually on tickover or deceleration, I put that down to my unbaffled motad 4-1, I have overwelded any holes in the pipes though and when I use my hand or wire will as a temp baffle it still pops.

Shall I try new points/condenser? Is the coil the culprit - how do I tell?
Title: Re: Timing
Post by: Bryanj on September 19, 2012, 02:20:34 PM
Throw away the strobe abd time it static as per the Manual, never used a strobe in all the years at dealers---only to check the advancer was working!
Title: Re: Timing
Post by: Robbo on September 19, 2012, 02:47:51 PM
Still popping when static timed
Title: Re: Timing
Post by: Bryanj on September 20, 2012, 07:17:54 AM
Most likely an air leak
Title: Re: Timing
Post by: Robbo on September 20, 2012, 12:01:29 PM
No change when I spray wd40 on the inlet rubbers, any other way I can tell if there is a leak?
Title: Re: Timing
Post by: ST1100 on September 20, 2012, 04:36:57 PM
No change when I spray wd40 on the inlet rubbers, any other way I can tell if there is a leak?

Use ether (starting aid spray from your lawn mower) or brake cleaner instead...
I doubt that WD-40 is sufficiently combustible...
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