Hi Guys. Been on the forum looking at the posts for about 12 months or so but this is my first post so hello everyone
Can anyone shed any light on this one as I can't seem to get anywhere on it?
My 1974 850 Mk 2A has developed a hesitation and misfire when riding at low throttle openings.
The bike has Boyer electronics fitted. I've checked the timing is OK (32 deg btdc with a strobe >5000 revs). The Amal Concentric carbs are only 12 months old from new with chrome plated slides so nothing should be worn out. The bike goes like a train from 1/3 throttle up to full power with no problems at all and happily pulls up to 100. I've also fitted new plugs and plugleads and the bike is sparking fine.
In desperation to sort it i've reset the tickover and pilot air screws from scratch using a Colortune on each plug. The bike now ticks over fine and revs up sounding fine in the garage but when I take it out it will not run smoothly on the road on low throttle openings. Nothing seems to sort it!!!
Has anyone any ideas cos its doing my head in :evil: :evil: :?
Can anyone shed any light on this one as I can't seem to get anywhere on it?
My 1974 850 Mk 2A has developed a hesitation and misfire when riding at low throttle openings.
The bike has Boyer electronics fitted. I've checked the timing is OK (32 deg btdc with a strobe >5000 revs). The Amal Concentric carbs are only 12 months old from new with chrome plated slides so nothing should be worn out. The bike goes like a train from 1/3 throttle up to full power with no problems at all and happily pulls up to 100. I've also fitted new plugs and plugleads and the bike is sparking fine.
In desperation to sort it i've reset the tickover and pilot air screws from scratch using a Colortune on each plug. The bike now ticks over fine and revs up sounding fine in the garage but when I take it out it will not run smoothly on the road on low throttle openings. Nothing seems to sort it!!!
Has anyone any ideas cos its doing my head in :evil: :evil: :?