Linkert problems

[Nigel]

Hi all I’ve got a 1953 panhead and I’m trying to run a m35 linkert , new Harold’s manifold new o rings and gaskets , starts up and ticks over great , revs great while stood still but soon as I try to go for a ride it starts missing and backfiring , tedsted manifold for leaks ok , there is a bit of play in throttle shaft ? , any answers would be appreciated thanks Nigel

[kitabel]

Whose float, and where is it set?

[Nigel]

Hi rubber duckie , and about 1/4 inch from top

[kitabel]

Are you sure all of the internal parts are correct for the M-35, including the main nozzle? IIRC Palmer has data on this, many other nozzles are similar and will interchange but affect function.

[RUBONE]

Check your points and condenser. Most carburetor problems are electrical!

[Nigel]

As far as I know it’s all right , I’ve set points and put new condensers in ,

[chop1543]

As far as I know it’s all right , I’ve set points and put new condensers in ,

What Rubone said. Just for yucks, put another condenser in. I've encountered your problem a few times, where the bike would start, idle, and rev in place, but break up and falter the minute it went down the road. A new condenser may not be a good one. I've taken them out of the package before and they were NFG. They deteriorate over time whether in service or sitting on the shelf.

[awander]

Has the bike performed well in the past with a different carburetor? Or is it all new to you?

[Nigel]

Hi awander was just going to mention this had a s&s super on it and it ran ok , but like the look of linkert so been persevering with it

[awander]

Hi awander was just going to mention this had a s&s super on it and it ran ok , but like the look of linkert so been persevering with it

Well, that pretty much narrows it down to the carb or fittings, unless you accidentally messed something else up when changing carbs.

A quick test would be to put the S&S back on and see if it still runs good.

I'm no carburetor expert, but I think the M35 has a 1-1/8" venturi, while the M74B has a 1-5/16" venturi. The M74B would have been stock on your 1953 74ci motor. The M35 was used on smaller 61ci motors.

Not sure if the smaller carb could cause the problem itself, or if maybe the jetting in it is just wrong for the 74ci motor.

[RooDog]

Just courious, which $&$ Super did you have, A, B, D, E, or G? Or maybe even an L, eh?

[PanPal]

I hope what you are saying about the Venturi is the cure for the issue. I recently changed from a CV to a M74B. It had small Venturi and started well, but just didn’t have any Getty up. I’ve installed the proper size now, but have not been able to test it due to waiting on my newly painted tins to be done.

[Nigel]

I’ve put the super e back on and it runs ok , linkert is driving me mad just about to drop kick it

[Andygears]

Are you sure the throttle is adjusted properly? Linkerts can move the throttle blade well over center if not adjusted so your throttle handle on the handlebar ends it’s travel when the carb blade is seen thru the carb mouth as exactly on edge. Any excess travel in the handlebar throttle sleeve should be at the idle end and unused when the carb hits the idle adjust screw.
I can see quick revs with over travel in the carb while sitting still. Because you can’t hold it wide open until you get it on the road with a load. Try backing it down and see if the engine speeds up, while on the road, or just adjust it correctly when you reinstall it.

Andygears

[Nigel]

It’s ok when standing but when I take it for a ride and open it up it starts popping and banging as though the timing is out