throttle cuts out in gear

so my 83 xj 750is having problems, it seems to be running more or less fine in neutral a little rough but like it always has but now whenever i drop it into gear then when i let out the clutch it just stalls its like there is no throttle response at all and even when i turned the choke way up and took off it would only idle and not throttle, but in neutral the throttle seems to work fine??? any ideas???

 

Problem with the sidestand switch, it "thinks" it's down so it's cutting the engine.

 

Fitz, he said it cuts out after he starts letting the clutch out...I don't think it's the sidestand switch. With the sidestand switch, I usually see the motor shut off just as soon as I move the shift selector. I'm laying odds that something is knackered with the clutch switch and/or associated relay. What say you? Am I missing something here?

 

No, you're right probably more likely the clutch switch than the sidestand switch since at this point we're reasonably certain the neutral switch is working.

If it's not simply excessive clutch drag on a poorly-running motor, then the best bet would be to temporarily unplug the safety relay (to bypass the entire system) and then see what happens.

If the problem goes away with the safety relay unplugged, then it's been narrowed down.

 

its not like cutting out its like not getting enough gas like the engine just dies, im thinking the engine just isnt having enough power when the clutch comes out and not getting any throttle casue at one point i was able to get it in gear and start riding but then i would open it to ful throttle and still no response but in neutral it revs fine so maybe just carbs???

 

Restricted air flow? Clogged fuel filter? Bad compression? There are a few roads to go down on this issue so start with the basics. Check your air box and fuel filter for blockages and do a compression test.

 

i just got the bike and it doesnt have a stock air box it has cone filters on it, do the crabs need tuned special for these, becasue i doubt they were?

 

Welcome to the ritual of cleaning carbs !! (and XJBikes)

First test - - warm the bike up, let it idle, get some water, see if all 4 pipes fry the water.

Second test - - if you have a dead cylinder, see if it barks to life when you raise it's brass plunger (enrichment/choke thingy) Or make a little rag on a stick, soaked with gas, stuck down the airbox into the problem carb's throat. (all cautions noted).

third test - - get a clear plastic tube and see if the 4 float levels are in line with the washer/screw for the float bowl (while running, on mainstand)

I'm thinking you have carb work ahead of you, not just a re-jet.

 

Yes, you will have to attend to the carbs.

However, item #1 should be a compression test, and possibly a valve adjustment.

THEN dive into the carbs. They're going to have to be surgically clean and 100% before you start trying to tune for 'pods.'

TIME's advice is spot-on, but do a compression test first. If you have a "soggy" cylinder or two, you're not going to get anywhere trying to do any carb work.

 

thanks guys i appreciate the help