Acceleration issues please help!!

Hi all,

I have the following issue after the bike sitting for a year decided to put her back in the road, a friend of mine cleaned the carbs and checked all passages.. bike did not start before, after cleaning started.

Took it out for a drive but can only make it run with the choke full to midway if I take it off the bike dies, also when accelerating on first I had the throttle full way and no power.. after cruising for a bit starts accelerating like is supposed to be, same happens on second.

Tried adjusting the idle with the adjustment screw but no matter which way I turn the revs dont change.

Any suggestions or things to try are appreciated is a XJ650 bike.

Thanks in advance..

 

Its very likely you neglected to clean the Emulsion Tubes.
They are pressed snuggly in the Center of the Carb Body and need some tapping upon then to knock them up through the top side of the Carb.

Consult with the person who did your Carbs and see if he drove-out the Center Nozzle (Emulsion Tube), ... if not your troubles are likely to be resolved with doing a better cleaning job.

Clogged Nozzle / NO Power:


To release the Nozzle you will have to remove the Main Jet and Washer, ... then... drive the Nozzle UP and out the Top.
Requires removal of the Diaphragm Assy.

 

Rick, thanks for your suggestion.. as it turns out drove it to my buddy place, so we can double check the carbs.. when the I got there barely oil poor all over his driveway coming out of the breather box.

I left the Petcock in PRI after cleaning and installing the carbs and the whole thing was flooded with Gasoline.

We changed the oil and ran way better, anything else I should I will look at older postings see if somebody else have done the same mistake before.

Again thanks for the response..

 

Do a really good bench sync on the carbs.
It sounds like your carb sync is waaaaaaaay off.

 

This situation has been encountered by a great many of our members.
Some had Petcocks that leaked.
Others hade Floats that need replacement.

Sounds to me like you should plan installing Carb Kits so as the Floats won't let Gas get down into the Crankcase.

I think you should pull the Carbs.
Replace the Float Needles and Seats.
Push-out the Emulsion Tubes and do a very comprehensive and thorough cleaning of the whole works.

Including:
Passages
Nozzles
Fuel Bowl Jets
Pilot Passages and Main Air Passages.
Float Height
Bench-type Sync of Throttle Plates

And then, ... put-on your set of really ready-to-go Carbs and Tune them.

 

I thought I cleaned my carbs too so dont feel bad! I hate putting the carbs back in though. Tight fit! Thanks for the pic!!!!!

 

Thanks, just pulled mine out to do the tubes I didn't do! Hope it helps. I made a special tool to knock the tube out but it aint budged so far.

 

A Metric Cap Screw of the same thread pitch makes an Excellent Tool.

You can tighten the Cap Screw in the Emulsion Tube Base and give it a good strike with a Blunt Excrement! : ) (Monty Python)

Hitachi Emulsion Tubes are not Keyed; so the Cap Screw just needs to tapped firmly enough to dislodge it and sent it out the top.

 

Hey Rick your slackin"!!! You forgot to tell this guy he should put his bike information in his signature. That way we know what kind of bike he is working on. It really does help. If you have a 650,750,700 with hitachi carbs you can use the screws for the float bowls to screw into the emulsion tubes to tap them out. If you have a 400,550 or 1100 you would have to get a m5 screw with I believe 1.00 pitch threads(or what ever number they use it is either 1.00 or 100).
You WILL have to replace your needles and seats because if you have gas in your crankcase you have 1 or more floats hanging up. Also sounds like you should get a fuel valve rebuild kit. If you go to partsnmore.com depending on the bike you have you may be able to get the kits and fuel valve rebuild kits for $69 if you have a 650,750 or 700. If you have one of these bikes get the float needle and seat and bowl gasket individually it is cheaper that way the only thing you don't get is the blind plug. If you have a 550 or 1100 you could go to carb kit capital. The cost through them is a bit more though. Or you could go to good old chacal.

 

Ok, all cleaned up and back together. Polished the vacuum slides as well. Tip; fine grade rubbing compound and a felt tip on the die grinder works wonders for the slide tube. It should maintain a around a 1.103 tube ID and a 1.100 thousandths slide OD. There were some really fine grooves in the slide but came out at .0005 so no problems. Now they slap down like a man who forgot his parachute!
I just turned a tube in the lathe to make a tap out tool. 5 min.

 

My MAC got its brain fried during an electrical storm.

Most of the Macros I had for answering the same questions weren't backed up along with all the web paged in my yamaha bookmark.

I have to handle New Members on a Case by case basis,

I think all the Members ought to encourage newcomers to complete their registrations.
You never know when you'll find a helping-hand close enough to swing-by and bail you out of a jamb.