My 79 SR650 will start and idle very well. Will not accelerate

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samurai idles fines but dies when you push pedal

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When stepped on pedal to accelerate engine dies but it ok while in idle

Check air filter, gas filter in bottom of tank and the rubber going from the carb to the engine for the signs of cracking...air leak is what your looking for, make sure the g like isn't too close to the manifold.... but most likely your coil pack is done... if the bike starts and idles great when cold then this is your problem.... most times it will b running on one cylinder if it is duel and one shuts down so it sounds like a dog, will go to a rough idle and be hard to keep going with a major loss in power...

I'm a bit confused here. The 1979 Sportster didn't have a distributor. I think 1969 was the last year that Sportsters had a distributor in them. On a '79 model, the first year that had the electronic ignition system, it was quite common to see them converted back to points type ignition. The original electronic system was unreliable and often failed. It was much more expensive to repair the electronic system than it was to replace it with an older points type system.

With that being said, most all the early Sportsters as well as the Big Twins had another weak point in their ignition system, the mechanical advance unit that is behind the breaker plate. The pivots for the fly wieghts will wear out and cause the ignition system not to return to it's proper retarded timing. It is best to simply replace the entire unit. Make sure you get one with the needle bearings in the flyweights. These will last a pretty good while. The standard unit will usually start to give problems within about two years if you ride very much. Before you take the breaker plate out of your bike, make sure you mark it so you can get it back in nearly the same position once you replace the mechanical advance unit. It would still be advisable to check the ignition timing once you get the point back in and set.

Install a Dyna, or equivalent, electronic ignition.

Hello Jim...
Ok, the ignition is stock...
**Have you removed the ignition cover and looked at the ignition sensor? Is resin dripping down the plate? IF so, replace the sensor, but that may or may not rectify this problem.

**YOU CAN Also remove the sensor plate and clean/inspect the pickups on the back of the sensor plate. Be sure to mark/scribe the plate prior to removal so you are back to the same timing.

**Also, check to make sure the


I also need to ask, -does your bike BACKFIRE upon Acceleration?
-does it BACKFIRE upon Deceleration?

And your idle should be set at approx. 950 rpm.

Let me know if the above has been helpful Jim...
-Marko