Bike has no guts, takes it sweet time to rev up and down.

[slipperymongoose]

Hi all ok as the the name suggests the bike starts and idles well but when I rev up and down just free revving it seems to take its time and on the road its got no guts to it. Ive taken the carbs off and im in process of cleaning them, Ive got the bowls off and im scared to undo the three screw things which im guessing are the jets. If I just soak the whole lot in carb cleaner should that be ok enough? cheers.

[slipperymongoose]

All good now I just soaked the whole lot and blown it out with compressed air so see how we go tommorow.

[ben2go]

Make sure you set the float heights/fuel level in the carbs.You will also need to sync/balance them once you get them on and fired up.Set your idle after about a 20 minute ride to make sure everything is warmed up.

[slipperymongoose]

Yeah I checked the float height this morning and the bike has only done 20k so the sync should be on the money still. But cheers much appreciated.

[slipperymongoose]

Ok update problem still exists, but I do have my choke working again. But after slapping my head seriously I think I havnt routed my fuel hoses correctly I think I have my vacuum and breather hose in the wrong places so tommorow I'll tackle it and try again.

[mister]

Spitball'n...

- Do you have an inline fuel filter?

- How is your air filter? The airbox? On the right side of the bike at the bottom is a tube with a cap on it - this runs down from the airbox. Take the cap off with a container beneath and drain the line.

- How are your spark plugs looking?

Michael

[slipperymongoose]

Just put new fuel filter in, new air filter, and new plugs. Well when I say new less than 6 months old.

[slipperymongoose]

Ok update carbs are clean, hoses routed correctly and no kinks, near new plugs and air filter, just installed in line fuel filter. Choke works again and well. But my problem is off the line. I have to twist the throttle to at least half because the motor bogs down till about 4 - 5k then it picks up and revs out fine. And when free revving it struggles till about 4k then revs out ok and when it revs down it gets down to 3k and still takes it time to settle down to idle. Please help I'm out of ideas lol.

[twinrat]

is your bike 01 or later my is 09 had similar symtons i did the timing mod on ignition plate and found screws that mount it supertight but the pulse generator screws even tighter, used impact driver to remove  in the process broke magnet in back of coil and wouldnt run right after that and had to replace whole pulse generator plate and coil as can not buy magnet seperatly .good luck

[Big Rich]

It bogs like it's running rich? Or is flat like it's lean? If it's carb related, than either your floats are off (just saying), mixture screws need adjusted, pilot jets are too big, or.......

Are your slides sticking at all? Loose diaphragm maybe?

[mister]

You have Just installed an inline fuel filter and now have problems?

Remove the filter and see how it goes.

Michael

[slipperymongoose]

Was running bad before the filter but I'll take it out and see how it runs. I'll check the floats again, engine is totally stock. Not sure how rich or lean sounds, it just bogs down then revs up when I get above 4k

[Big Rich]

Normally I don't do this, but I disagree with Mister. I think a fuel filter would cause it to get worse with higher revs, not better.

I would really look at the diaphragms, needles, and slides. Sounds to me like the engine isn't producing enough pressure to lift the whole assemblies until higher rpm's.

[numus]

Plugs gapped correctly? You make sure the leads were attached firmly?

[bombjack]

At least one of the exhaust valves are too tight.
My GS suffered the same thing. I cleaned and adjusted the carbs a billion times because I was sure it had to be a carb problem.

[The Buddha]

Slow rev up and rev down - Could you have a broken slide spring ? or something else like that - how is the air filter ? Yea Big rich's sticking idea sounds good.

Now 4-5K is actually from stopped ? ... I mean you're taking off from a stop - I'd guess you have lean pilots. That is stock, go to 20's. Also make sure you dont have air leaks.

Bombjack: Tight valve wil lcause it to want to stall and die right after start up, if you give it throttle and keep it revved for 5 mins or so, it will usually run fine after that, unless its way tight, which then will stall when you let got of the throttle even when hot.

Cool.
Buddha.

[mister]

Normally I don't do this, but I disagree with Mister. I think a fuel filter would cause it to get worse with higher revs, not better.

I would really look at the diaphragms, needles, and slides. Sounds to me like the engine isn't producing enough pressure to lift the whole assemblies until higher rpm's.

I agree it sounds counter-productive for a restrictive fuel filter to allow more fuel to get better Go as the revs (and fuel use) increases. However, it is an element that is known to cause issues. By removing it you remove something from the equation. That's why I suggested it. 

Michael

[slipperymongoose]

Did the valve check all within spec bike has only done 20 000k. Plugs are correct, and same problem before and after the filter. Slides and diaphragms looked good and moved freely, I ran the bike without the airbox yesterday quickly to check there movement and they moved together and ok, all the springs were ok too. Would too much fuel in the bowl cause this? I'll triple check my float bowl height then pull the carbs off again if they check out ok again. By the smells of things I think im rich and I'd like to no how that happens when nothing has been touched. Here is what I've done to the motor so far: valve clearance check(all in spec), head re tension, new plugs, new air filter, in line fuel filter, carb clean, new exhaust gaskets, (stock carbs and exhaust).

[mister]

Is your air filter stock too?IE, you haven't swapped for a Lunchbox, still got the original air filter configuration?

Michael

[slipperymongoose]

Yep stock filter box and paper element.