SOHC.co.uk Forums > CB750

jumping ...missing and backfiring

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K2-K6:
Yes as you say Billy with the marks as you describe, after i've done that i'd install the cam chain tensioner and then turn the crank (plugs out) with a spanner at least two rotations forward and recheck that the horizontal lines are still in line with the cam carrier joint to make certain that it is correct when in the fully assembled running condition.

As the other posts have said, if the ignition stays at advance and doesn't go back to base/static setting at low rpm then you'll have a similar effect with a conflict of inlet valve opening and spitting the first part of the intake charge back out of the starting to open inlet tract.

billy192:
thanks Guys, yes john (Caerphilly) the bike ran great the intermittent revving settled down after 400 or so miles the out popped number one. well i have a nice 4 day stint to sort this out thanks to the forum i have a list of stuff to change / clean adjust. i will post my findings and hopfully sort this out.
Billy

billy192:
Ok so today i put on the new carb to head rubber and new carb to air box rubbers with new clips...and still the same :(
as a last resort new condensers and points and checked the auto advance unit put all back together timed with a bulb (static) and fired her up and perrrrrrrrrrrrrrr like a pussy.  8)
will take her for a blast in the morning gut great no miss no popping
Billy

mike the bike:
The thing to do now is refit the old condensers to determine whether the fault was caused by the points or the condensers.
I don't blame you if you don't feel like it though.

Sparrow1:
Pleased for you Billy.
  LEAVE IT! If it now runs sweetly...😉😄 Go out and have a bit of fun her!
  Nige.
 

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