Faulty TPS

[kjt99vt]

Hey everyone,

Long time reader, first time poster. I’ve scoured the forum for some experience here but can’t find anything.

Bike is 1984 k100 2v and I think I have a dud TPS. The TB has been synced accurately, every perishable item replaced. And I’m having some strange issues that seem to be the TPS. Seemingly at higher rpm the bike is quite responsive, lower rpm is a bit sluggish then in all gears when I decelerate it jerks around 2000rpm and the tacho can be pretty erratic. The TPS was adjusted perfectly to the point where it would click open and shut, but it won’t click shut if I slowly release the throttle, only if I drop the throttle and it snaps back fast.

If I remove the TPS plug it runs quite poor, but the 2000rpm jerking issue disappears.

I’ve tested the resistance of the TPS and that seemed fine 🤷🏼‍♂️

Has anyone else had this issue?

[Laitch]

Have you determined whether the vane in the airflow meter is moving smoothly and completely through its entire range of travel, and that that the terminals of its plug connection are clean and the plug fully seated?

[kjt99vt]

Hi Laitch,

I’ve checked the AFM and exchanged it with the AFM from my 88 that runs like a dream.

I’ve ordered a new FPR simply because the current one is 39yrs old but that could be overkill too, but it was fairly cheap.

Other that TPS I’m lost, bike has had everything thrown at it 🤦🏼‍♂️