[IanSmith]

After trying 'everything' the 5000rpm stumble turned out to be caused by a loose low tension connection to my new coils OR the fact that I have iridium plugs with resistors in.

I finally fixed the problem by soldering the wires properly and fitting a pair of old drea8 plugs.
No more stumble around 5000rpm when on the road, loads of power through the range.

/cool.gif' class='bbc_emoticon' alt='B)' />">


Once it was all working well again, I when out and got a new battery

/blink.gif' class='bbc_emoticon' alt=':blink:' />"> and now the old beauty starts just by looking at the switch

/biggrin.gif' class='bbc_emoticon' alt='' />"> Instant smoothidle.

For about 30 seconds, she is reluctant to rev up - tends to die if I try - but then all is well and can rev up to whatever I want. Also, the choke only increase revs to just over 2000 - I'm sure it used to be closer to 3000... but she's been like this for a while.

My next task is to figure this out.... but I'm not worried about it too much!

 

[Crshndbrn]

Also, the choke only increase revs to just over 2000 - I'm sure it used to be closer to 3000... but she's been like this for a while.



My next task is to figure this out.... but I'm not worried about it too much!

When I rebuilt my carbs, I noticed that one of the choke flaps inside the carburetor was not closing properly, it was getting hung up on the carb body and sticking half way to closed. with a little sandpaper and some creativity, the choke works wonderful now.

 

[IanSmith]

After trying 'everything' the 5000rpm stumble turned out to be caused by a loose low tension connection to my new coils OR the fact that I have iridium plugs with resistors in.

I finally fixed the problem by soldering the wires properly and fitting a pair of old drea8 plugs.
No more stumble around 5000rpm when on the road, loads of power through the range.

/cool.gif' class='bbc_emoticon' alt='B)' />">


Once it was all working well again, I when out and got a new battery

/blink.gif' class='bbc_emoticon' alt=':blink:' />"> and now the old beauty starts just by looking at the switch

/biggrin.gif' class='bbc_emoticon' alt='' />"> Instant smoothidle.

For about 30 seconds, she is reluctant to rev up - tends to die if I try - but then all is well and can rev up to whatever I want. Also, the choke only increase revs to just over 2000 - I'm sure it used to be closer to 3000... but she's been like this for a while.

My next task is to figure this out.... but I'm not worried about it too much!

 

[IanSmith]

Thanks Crshndbrn



I'll take a look at that sometime soon, you may be on to something.



You got me thinking - Larry rebuilt the carbs and they look and work really really well in all other respects. In fact this problem started after I removed and refitted the carbs for some other work a few weeks ago.



So maybe I have pinched the rubber boot from the air box so there's a leak... work a quick look.

 

[Chaz UK]

after doing a lot to my carbs I still had some problems and what fixed the things was a new air filter,,

I can tell you the old one did not look bad. try it