96 m900 fcr41 carb leaking issue

[koko64]

I gave them a quick 1/4 turn and went for a spin.

Didn't make it to the highway yet, but a 1/4 turn in greatly improved the low speed drivability, so hopefully the highway will be a bit better too.

I honestly have no idea on the jetting and clip settings. I bought a bike that had these installed already so I've not been inside them. I know they came from CA-cycleworks.

Show us a spark plug.

[ducriderinct]

Koko, I'll pull one and snap a pic tomorrow.

Speeddog, I'm not really sure how the first ones would work in the available space in there, but the standard knob ones look pretty Intriuging... If I end up doing a lot of fiddling with them it might be worthwhile...

[Speeddog]

I'd likely do a different bracket for the knob on the flex cable one, put it where it's most handy.

By the time I saw those knobs, I'd gotten my FCR's close enough to right, I just couldn't justify it.

[ducriderinct]

Here's some photos of the horizontal cylinder plug:

[greenmonster]

Are these pics taken after idling a while?


"however, when I get on the highway and try cruising at around 60 to 65 in 6th gear at partial throttle around 4500 RPM, it sputters and pops and hiccups like its flooding or something..."

When that happends, hit kill switch and take a pic.

Air screw, how many turns out?

[ducriderinct]

I did have it idling for 3-4 minutes or so in the driveway before I put it back in the garage. Does that count? I have no idea on the air screws or any other screw settings.

I don't know what baseline is supposed to be or where anything is currently. Honestly, I'm kinda afraid to touch too much as I really don't know what I'm doing and don't want to take a running bike and make it not run

[Howie]

Yes, do what greenmonster says.  Do select a safe location to perform this.

[ducriderinct]

Ok. I'll try to do that tomorrow since it looks like I'll have a light day of work.

[greenmonster]

Screws:
Low speed fuel jet: Bottom of fuel bowl.
Air: Remove air filters, the adjustable at inlet it is.

Just take it slow, one at a time. Make notes.
Screw them in, noticing how many turns.
Probably, sooner or later you'll have to do this,
making sure they in the ballpark and EVEN...
Sooo easy one is a half turn off, we're all been there....

[ducriderinct]

Finally had a chance to take a look again at the fuel screws on the bottom of the carbs. Currently, they're about 3/4 of a turn out after I put them back where they were originally after fiddling with them.

I was starting to see that same hesitation at low speed riding after a while as well once I turned the srcews in a 1/4 turn so I put them back.

This configuration ran perfectly on the other stock motor, so I'm hoping that my adjustments cant be that far off. Is it possible I need to turn them out to compensate for the colder temps leaning out the mixture?

[Speeddog]

Yes, they may need a 1/4 turn out for the colder temps.

I don't think the FCR's compensate for air density at all, or at least nearly as much as the CV Mikunis do.

[ducpainter]

Yes, they may need a 1/4 turn out for the colder temps.

I don't think the FCR's compensate for air density at all, or at least nearly as much as the CV Mikunis do.

I think you were correct with the 'at all' comment.

[ducriderinct]

So after an hour of riding, and lots and lots of fiddling with the fuel screws, at about 3/4+ an 1/8th of a turn the problem is there but less so than in any other position I could find.

I pulled the horizontal cylinder plug after killing the motor while it was happening and this is what it looked like:





Not sure if it's related or not, but after being on the throttle partway for some distance, like when riding on the highway at a constant speed, or on surface streets at a constant speed, when I let go of the throttle and pull the clutch in the idle stays very high. I mean I like in the 2 to 3000 RPM range.

This happens when the idle is set at around 1200 RPM when at operating temperature. If I dial the idle back down to around 1000 or just under, the engine drops to idle much more quickly.

[ducpainter]

With FCR's don't look for a number on idle speed. Just set it so it drops back quickly, and doesn't stall.

It isn't related to the constant speed running issues, if any. That plug looks OK to me.

[ducriderinct]

Hmm, ok. That's good I guess

Can the idle being set too high cause this issue? I have a roadracing tach setup and have been going by the numbers...

Maybe it's just set way too high?