rs34's

no clacking, running webcams 0.395 at lobes of 104,5 en 108. Gives VERY much torque from 2500-5000rpm. No kick at 9000rpm but will rev 11.000rpm

martijn wrote:

no clacking, running webcams 0.395 at lobes of 104,5 en 108. Gives VERY much torque from 2500-5000rpm. No kick at 9000rpm but will rev 11.000rpm

You should avoide runing to 11000 rpm at all cost.You may get lucky but you could very easily hit a pison with a valve.I did. allthough i do have larger valves and cams.
what year/model, was your bike? What carbs?

what size is your baffle,and what pipe are u running?
You said u have pinging in the mid range. what rpm?
do u know how many psi compresion u have?

I leaned out my carbs a bit ,17.5 pilots air screws at 1/4 turn out instead of 1/2.needles dropped to #2 clip. The slight clacking at idle, and 3000 to 4000 rpm is completely gone now. The plug color looks good but the rpm hangs slightly. If i close the throttle the rpm goes down to idle but not as quick as it should. I’d say that is a lean symptom. Man its hard to read these things. going by plug color just doesn’t seem to be the best way. I wish i had 1 of those Exhaust gas analyzer gauges, Or a Dyno in my garage.
It runs good though. I wont worry about it anymore this year. The cold weather is leaning it out a bit too. My new float needle seats are still leaking a bit. I jut got a new petcock to try and a new sealed tank.
its suposed to be nice out tomorrow . My clutch has been sticking, so i will drain the oil , check my clutch plates and, grease the actuator.

Sounds like you've got it really close. I haven't even had time to work on mine since I thought I blew the engine!:lol: I'm glad to hear that the clacking can be limited with tuning. That is really annoying me. I'm hoping to synchronize mine and maybe that will help too?

Not sure about the sticking clutch - is the cable and actuator adjusted properly? Is it dragging when you have the lever pulled in? Or do you mean the lever action is sticky, not smoothe?

It just started to stick uppon releasing the clutch lever.
What size did u say your baffle was? u could try removeing it just to see how it affects the clacking.i think the baffle size is a big factor here.

mark1122 wrote:

It just started to stick uppon releasing the clutch lever.
What size did u say your baffle was? u could try removeing it just to see how it affects the clacking.i think the baffle size is a big factor here.

I forget the baffle size - maybe 1.25"?? - it's the V&H racing version for the megaphone exhausts. I recently drilled some holes internally to increase flow but haven't had a chance to try it yet. Maybe that will make a difference.

So the clutch isn't engaging when you release the lever? It's slipping?

The cluch does not release smoothly. It starts to slip smooth, then nothing, then i keep letting it out and it grabs more again. I hope to take it apart tomorrow.

79MKII wrote:

the baffle...it's the V&H racing version for the megaphone exhausts.

the baffle does make a difference and the racing baffle is a good choice. I also agree with Mark, try running with no baffle just to see what happens.

Have you ported your head? Opening up your intake ports will also make a difference. Bigger intake ports will tend to produce more clacking. Your carbs/engine will not respond too well while the carbs are clacking and the results of switching to a different type of carburettor to get better performance are debatable.

martijn wrote:

no clacking, running webcams 0.395 at lobes of 104,5 en 108. Gives VERY much torque from 2500-5000rpm. No kick at 9000rpm but will rev 11.000rpm

Out of curiosity, have you done any porting on this head? If so, what was done? Also, what exhaust are you running? thanks.

The head was professionally ported and totally rebuilt. I just started my bike and it's running terribly. I didn't even try to ride it, just trying to get it to idle. It was pretty dark and I could notice giant flames shooting out of the baffle and it's really popping loudly. Mixture screw adjustments don't seem to make any difference. I also noticed that the #1 exhaust doesn't seem to be as hot as the other 3. I don't know if it's the carbs or a plug, maybe the coils or what - but it ran great the ride before last. I don't get it!!??

Does the popping and flame shooting usually indicate a lean condition?

79MKII wrote:

Does the popping and flame shooting usually indicate a lean condition?

not a lean condition. that would be popping out the intake.

Sounds like the #1 cylinder isn't firing. Raw fuel is then sent into the exhaust and burned there (ie popping and flames) remove the #1 spark plug. If the porcelin is wet or black, replace it. If not, connect the plug`wire, ground the plug against the block and turn the engine over to see if you have spark.

While you're at it, you might want to pull all the plugs to check their condition.

Definitely do this before you start messing around with any carb adjustments. Also, unlike most other carbs, the RS34s only need a small amount of mixture screw adjustment. start with 1/4 open and don't go past 1/2 turn.

davel wrote:

79MKII wrote:

Does the popping and flame shooting usually indicate a lean condition?

not a lean condition. that would be poping out the intake.

Sounds like the #1 cylinder isn't firing. Raw fuel is then sent into the exhaust and burned there (ie poping and flames) remove the #1 spark plug. If the porcelin is wet or black, replace it. If not, connect the plug`wire, ground the plug against the block and turn the engine over to see if you have spark.

While you're at it, you might want to pull all the plugs to check their condition.

Definitely do this before you start messing around with any carb adjustments. Also, unlike most other carbs, the RS34s only need a small amount of mixture screw adjustment. start with 1/4 open and don't go past 1/2 turn.

Thanks for the tip - that makes sense. I did pull the plugs before I started it and they actually looked pretty good. I pulled #1 after I noticed the pipe wasn't very hot and it was black and wet. I haven't had a chance to check for spark yet, but that will be next. I'll probably change all 4 plugs and try again. I'll also reset my mixture screws to about 1/4 before starting. Maybe it's just a fouled plug?? I hope that's it. Thanks again!