RS 80 Carb question

Is anyone that is using a CR 80 motor using the stock keihin PE 28mm (non power jet) carb on their RS 80?

Or... Is everyone running a powerjet carb? If so, which one?


Thanks,
Chris

Is anyone that is using a CR 80 motor using the stock keihin PE 28mm (non power jet) carb on their RS 80?

Or... Is everyone running a powerjet carb? If so, which one?


Thanks,
Chris

In the spirit of keeping close competition, I have found that the Keihin PWK 28mm D slide is a very effective carb. It has great response throughout the band and is easy to jet. There is also lots of info available out there for it. I hope I was some help, Anthony.

In the spirit of keeping close competition, I have found that the Keihin PWK 28mm D slide is a very effective carb. It has great response throughout the band and is easy to jet. There is also lots of info available out there for it. I hope I was some help, Anthony.

I was told the "D" slide was the way to go, but I didn't notice a big gain in performance.

I seem to have lost my carb, so I'm running the 'stock' 28m round slide for now.

one thing you may want to do is ensure the pilot jet is richer than you think. I have seen a couple of motors sieze when the rider chops the thottle at the end of a long straight.

I was told the "D" slide was the way to go, but I didn't notice a big gain in performance.

I seem to have lost my carb, so I'm running the 'stock' 28m round slide for now.

one thing you may want to do is ensure the pilot jet is richer than you think. I have seen a couple of motors sieze when the rider chops the thottle at the end of a long straight.

Thanks guys, I was mostly looking to see if the Power Jet was needed. From what I gather, non power jet carbs need to be fat enough just off the pilot that they don't lean out too much when you feather the throttle back. The power jet takes care of that so you can run it crisp on the pilot, yet squirt the richening shot in there when it needs it in that transition off the pilot and on to the needle.

Am I on the right track?!?!

Thanks again.

C

Thanks guys, I was mostly looking to see if the Power Jet was needed. From what I gather, non power jet carbs need to be fat enough just off the pilot that they don't lean out too much when you feather the throttle back. The power jet takes care of that so you can run it crisp on the pilot, yet squirt the richening shot in there when it needs it in that transition off the pilot and on to the needle.

Am I on the right track?!?!

Thanks again.

C

Actually............

The power jet circuits are metered as
part of the main circuit and are on
untill a predetermined high RPM then shut
off. The TM, PJ type carbs tend to run
rich at high RPM so they use the
power jet to balance this out.

Older TZ's and pre '02 RS's it was a
fixed setting at about 12K RPM.

Newer RS's it is tuner adjustable with
different plugs in the wire harness from
11 - 13K RPM.

The power jet has absolutely no effect on
the fuel mixture till about 1/2 throttle
regaurdless of rpm. It is a
siphon that works off air pressure differentials
and there isn't enough air flow at
lower throttle settings for it to function.

You may have it confused with an accelerator
pump.


[img]/ubbthreads/images/%%GRAEMLIN_URL%%/smile.gif[/img]

Actually............

The power jet circuits are metered as
part of the main circuit and are on
untill a predetermined high RPM then shut
off. The TM, PJ type carbs tend to run
rich at high RPM so they use the
power jet to balance this out.

Older TZ's and pre '02 RS's it was a
fixed setting at about 12K RPM.

Newer RS's it is tuner adjustable with
different plugs in the wire harness from
11 - 13K RPM.

The power jet has absolutely no effect on
the fuel mixture till about 1/2 throttle
regaurdless of rpm. It is a
siphon that works off air pressure differentials
and there isn't enough air flow at
lower throttle settings for it to function.

You may have it confused with an accelerator
pump.


[img]/ubbthreads/images/%%GRAEMLIN_URL%%/smile.gif[/img]