Hi all this is probably a very open ended question but now I’ve done a few good runs on the bike I was hoping things would settle but at idle if you give it a rev it takes a while to drop back down to idle speed, the plug looks a good colour and I’ve checked round the carb for leaks an all seems fine so don’t think there is an air leak at the inlet so what else could cause this? Could worn valves or valve stems be the problem
Cheers Neil
1954 350 idle
-
- Member
- Posts: 388
- Joined: Tue May 25, 2021 10:50 pm
- Location: Oxfordshire UK
1954 350 idle
Everyday’s a learning curve.
- clive
- Member
- Posts: 5657
- Joined: Mon Jan 01, 1990 12:00 am
- Location: LONDON UK
Re: 1954 350 idle
Worn throttle slide. Air leaks round it. Usual symptom is as you describe, fast idle as you pull up and if falls back in time or often with a gentle blip of the throttle. New slide may fix it for a while but it tends the wear the internal body too.
clive
if it ain't broke don't fix
if it ain't broke don't fix
-
- Member
- Posts: 388
- Joined: Tue May 25, 2021 10:50 pm
- Location: Oxfordshire UK
Re: 1954 350 idle
Cheers Clive, I do find I’m frequently playing with the idle speed screw to get the idle right and the carb on it was from flea bay and is a monobloc (not pre monobloc as it should be for that year) so could well be worn I will check it out, I do have another I can try.
Neil
Neil
Everyday’s a learning curve.
-
- Member
- Posts: 90
- Joined: Sun Aug 26, 2018 9:07 pm
- Location: Germany
Re: 1954 350 idle
If you want to make sure the idle mixture is ok, you might consider to get a “Color Tune” Sparkplug. I use it for tuning my idle mixture and it works. Just google it…
-
- Member
- Posts: 8542
- Joined: Wed Sep 01, 2004 1:00 am
- Location: WEST SUSSEX UK
Re: 1954 350 idle
I've never bought a second hand carb on the basis that neither I nor anyone I know has ever had to replace a good one.
'There is a tide in the affairs of men
Which taken at the flood............'
Which taken at the flood............'
-
- Member
- Posts: 388
- Joined: Tue May 25, 2021 10:50 pm
- Location: Oxfordshire UK
Re: 1954 350 idle
I do have one I’ll have to give it a go.Yves.Astein wrote: ↑Tue May 24, 2022 10:29 pm If you want to make sure the idle mixture is ok, you might consider to get a “Color Tune” Sparkplug. I use it for tuning my idle mixture and it works. Just google it…
Everyday’s a learning curve.
-
- Member
- Posts: 388
- Joined: Tue May 25, 2021 10:50 pm
- Location: Oxfordshire UK
Re: 1954 350 idle
I’ve never thought of it like that, but it could be a spare they are selling but at the time I didn’t have one and the price was good so thought it was worth a punt
Everyday’s a learning curve.
-
- Member
- Posts: 388
- Joined: Tue May 25, 2021 10:50 pm
- Location: Oxfordshire UK
Re: 1954 350 idle
So had a check of the original slide and there did seem to be wear so I swapped it for another one I had which seemed a better fit and initial tests it seemed ok but now I find it ticks over at a nice speed, can ride off and sometimes when I stop it ticks over at the nice low speed then next time I stop it ticks over noticeably higher and just stays there, then next stop can be back down low again is this still a worn slide scenario?
Neil
Neil
Everyday’s a learning curve.