1979 model year DOHC 750 not returning to tickover ?

[harley metisse]

Hi all, quick question if I may, I have a 1979 manufactured 750 DOHC 750 which at times doesn't go back to tickover when the throttle is closed.
It "hangs up" on occasion at about 3000 revs, not every time, just sometimes.
I have new inlet manifolds fitted, all appear to be good, the cables aren't snagging at all.
Any ideas.?

 

[brettp]

Sync the carbs. Vacuum mismatches can hang the revs before idle.

What do you mean "back to tickover"?

 

[Old_Crow]

Sync the carbs. Vacuum mismatches can hang the revs before idle.

What do you mean "back to tickover"?

tickover is a British term for idle. Meaning "engine won't return to idle" to us colonials.

 

[Rampton]

tickover is a British term for idle. Meaning "engine won't return to idle" to us colonials.

You British old crow?

 

[Old_Crow]

You British old crow?

No, but I did ride Triumphs for a few years back in the '80's.

 

[SenseAmidMadness]

Hi all, quick question if I may, I have a 1979 manufactured 750 DOHC 750 which at times doesn't go back to tickover when the throttle is closed.
It "hangs up" on occasion at about 3000 revs, not every time, just sometimes.
I have new inlet manifolds fitted, all appear to be good, the cables aren't snagging at all.
Any ideas.?

How recently has it had a valve clearance check and adjustment? That and a good carburetor synchronization, with no vacuum leaks anywhere in the intake system, will usually solve this problem. Also make sure your air filter is clean -- or if it's not an original-spec filter that you've got your jetting changed to match. If not then one of the carb slides may be sticking open and that requires some internal carburetor work.

 

[brettp]

+1 to valve job, too. Made my bike run night and day different. Carb sync after is practically a must.