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Carb Problems With A GS650

  • Thread starter Thread starter Dano
  • Start date Start date
I do not know exactly where on my carbs I need to drill.If you know could you please let me know.Also are the jet sizes i have right now (47.5& 125) going to be alright after I drill?Can i drill without buying a jet kit?I think I can just shim the needles and drill out the orifices.What do you think?I also wanted to thank you for all the useful info you've been a great help. So THANKS.

Dano
 
Dano said:
I do not know exactly where on my carbs I need to drill.If you know could you please let me know.Also are the jet sizes i have right now (47.5& 125) going to be alright after I drill?Can i drill without buying a jet kit?I think I can just shim the needles and drill out the orifices.What do you think?I also wanted to thank you for all the useful info you've been a great help. So THANKS.

Dano
Click to expand...
There is a hole that allows vacuum into the diaphragm chamber. This hole has to be enlarged. The hole has to be a certain size and drilled correctly.
This info is in the jet kit and because there could be specifics, I don't want to guess and lead you to doing something that would ruin parts in your carbs. Enlarging the vacuum orifice is necessary for throttle response, so your jet size choices are a seperate issue. My previous post is the jet sizes I would try for starters if you don't buy a jet kit.
Someone here who has done the job correctly may help you with the drilling, or you might post a topic for this info? Just be sure of who's helping you or the parts will be ruined.
You can drill without a jet kit, but you'll still have to make your stock jet needle work. Simply finding the correct thickness spacers and raising the needles may or may not be enough. Some jet kits include an adjustable needle that is also TAPERED differently. They change the shape of the needle because it performs better. I have no hands on experience with your model so I can't say if you'll be OK just by shimming up the needles. Personally, I would buy the jet kit.
 
OK, I've syncronized, set the floats to 21mm. Drilled out the vacuum orifice, cleaned all the jets, raised the needles, checked all 4 plugs and still just 60mph top gear. What else could it possibly be.???? I even taped the pod fileters half closed. It seems that no matter what adjustments I make, all I can get out of her is 60mph. I'm totally lost. It starts fine, idles fine. Acceleration could be better, but it's not too bad. Is there anyway the voltage regulator could cause any problems? Anything else that could? I would like to just give up, but I'm obsessed now. I want to be able to get it to run like it should. I know it's going to be fun once it's right. So any other suggestions would be great. Thanks

Dano
 
Where did you get the info to drill out the vacuum holes? What did you do in raising the jet needles? By your posts, I have to believe there's something wrong with your carbs. Vacuum related. Your choice of mains and pilot jets would not result in a 60 mph top speed.
 
It may be time to read your plugs again, too. The plugs tell all...

Check your spark on all plugs, you should have a fat blue spark from every plug.

Check your advance timing, if applicable. (83, that has the electronic timing, dosen't it?)

Run screaming from the garage and have a beer.
 
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