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another jetting question

  • Thread starter Thread starter horror1972
  • Start date Start date
horror1972 said:
Tried everything.
first re-adjusted yhe ignition with a strobe and bench synch teh carbs.
out the needle on the 4th and 5th pos.
tried a 122 and a 128 main jet, tried with both setups the pilot on 1/2, 1 , and 1 1/2, still no effect:
bike runs fine at idle, but when i open the trottle a little bit, it stops accelerating and even almost dies.

when the engine is hot, and I put the choke at the middle, it runs a lot better, even respons to trottle.

what the he** is wrong???
Click to expand...
Something isn't right or you've got something else wrong other than the carb jetting.
The jetting I gave you would not cause your problem.
I can only assume the bike is tuned correctly other than the jetting but I'm doubting that now.
If carb/jetting related. If it idles fine (pilot circuit) but won't rev past idle (using light throttle/still on pilot circuit), then some common problems are starved for fuel due to a clogged pilot circuit, float level is way off, large intake leaks not allowing enough vacuum to suck up pilot circuit mixture.
Starving for air can result in your problem too. Over oiling pods or oiling pods that aren't supposed to be oiled can cause this.
Your carbs are supposed to be VM 26 round slide carbs. Are they? Your problem also sounds like the classic damaged rubber diaphragm but those are only used in CV carbs. A torn diaphragm will allow idling all day but will accept no throttle. Can you show us a pic of your carbs if any doubt?
 
another jetting question

Hi Keith,

I found , thanks to you, the inlet was leaking air.
I reassembled them with liquid gasket, so I will see the next morning.
I didn't mention I used a keyster refurbish kit; To be sure I put all the original mikuni stuff back with new o-rings, cleaned the carb again with brake-cleaner and air, and set the float height to 24 mm.

carb1.jpg




carb3.jpg



I'll let you know tomorrow,


Thanks,

Marcel
 
OK. Hope it runs good.
Gotta mention though, new manifold o-rings should be used along with making sure the manifolds are in good condition too.
Using sealant between the manifold and head isn't the way to fix an intake leak.
 
another jetting question

put new o-rings at the intake boots today, no result!

I removed the cover of the ignition while the bike was running, and saw that the breaker points were not sparking equallly, but now and then...

could this be the problem?

I ordered to be sure a new pair of contactbreakers, but forgot to order the condenser.
Can i get two of those at the elecronics-shop, I read they must be 0,25uF, or do I need original ones?
 
Last edited:
Good spark is a basic tuning/maintenance issue. It needs to be done before jetting.
I can't answer if you can use some other condensor at an elect' shop. I'd suggest original parts. A Dyna S system would be better if you can do it.
 
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