I have a K&N filter and V&H exhaust, so I rejetted to 150/40, and replaced the adjustable needle jets with the stock ones. Then I adjusted float height. After that it wouldn't start so I pushed it to a lcoal shop in Queens, NY. The owner is a 50-yr-old bull-riding bike guy from Texas! Turns out something from the carb had fallen into the intake manifold when I removed the carbs. I knew the valves needed adjustment, but I had no idea that one was stuck (I was running on one cylinder for weeks! Its my first bike so I couldn't tell).

So bottom line, the guy fixed my stuck valve, rejetted even BIGGER (I thought 150/40 was big enough) and put the bike on a Dyno to make sure it ran perfect. This cost me $275. Too much? I'm going to pick it up later today, so I have no idea how its running. He said its running great but we'll see...

Damn I wish I had a garage with tools so I could do more stuff on my own. It really blows working on my bike on the sidewalk cuz you have to put it back together before the end of the day.

Depends on how much time he spent working on the bike. Check the shop rate.

sounds similar to my problem.
that is, running on 1 cyl.

well after sitting for more then just a day, it runs fine for a little while.
But then its getting too much gas and starts acting up. (lack of power, Major backfiring when giving it throttle, etc)

Hope thats all my problem is, something fixable way below the $500 mark.

They've had it since last Thursday and didnt even Touch the dang thing when I called on Monday..... WTF is the point of an appointment then???!!!!

Not too bothered as I would rather them take this long to Get to it, then take this long to Find the problem.

Wouldnt mind a $200 and some $ bill at MOST tho.

Cause I got it to spare and anymore then that and I'll have to pinch pennies for 2 or 4 weeks.

actually, i think im gonna give them a call right now and see wtf they have been doing.

I'm wondering what actually got sucked into the intake. If you look in the mouth of the carbs, there isn't really anything that can "fall off".

Tombstone, where are you from again? The Philly area?

275 with a dyno tune is cheap

Quote from: Big Rich on July 08, 2011, 11:40:10 AM
I'm wondering what actually got sucked into the intake. If you look in the mouth of the carbs, there isn't really anything that can "fall off".

Tombstone, where are you from again? The Philly area?

Wilkes Barre / Scranton area in North east Pa.

and just got off the phone with the garage....
slightly ticked they didnt call me with a quote Before working on it as I didnt say Fix it!
I made an app to Check it.
Its okay tho as I planned to have it fixed if it wasnt a Motor problem in the $500+ range.

Will be back on the road Monday they said and at the Most it will be around $240.

Needed a full carb cleaning and adjustment.

didnt look that dirty when I had it apart but I couldnt get the Jets out as I woulda ended up stripping them, so I couldnt tell how dirty those were.
So a garage visit wouldnt of been avoidable anyways.

But enough of me hijacking the thread on my problems since it ended up not being similar to the posters.

fall off from the air box side into the carbs or into the motor?
sry new to cycle mechanics.

heres a way something can fall off into the carbs or motor. (when taking the carbs out)
With boots like these (were my old ones that just broke apart when I grabbed the carb to take it out!)



(sry, camera on my phone sucks)
thats a pic of the side that mounts onto the engine.
the metal around it that mounts it to the engine were completely rusted and fell apart.
Both were identical in how badly rusted and fallen apart that one is.

new ones are on there now tho.

Intake manifold - That is definetly dead ... long dead.
With that much damage to it, you can suck external stuff, rocks, twigs, etc etc in freely
What jets are you running now, I dont think a stock 89-00 GS can use anything larger than a 150 mains or a 40 pilot. I did several O2 sensor runs before landing on 150 in canada in winter no less, and in CA in summer and winter. 152.5 actually results in a loss of about 300 rpm @ WFO under full load. Definitely over the sweet spot. 155 is really much much worse, like over a 1000 rpm loss and worse across the range. The sweet spot is somewhere under 150 but very close, of course colder, humider and denser air can get it feeling lean no matter what.
Cool.
Buddha.

Quote from: joshr08 on July 08, 2011, 11:44:54 AM
275 with a dyno tune is cheap

yep sounds spot on to me.

Quote from: The Buddha on July 08, 2011, 03:07:08 PM
Intake manifold - That is definetly dead ... long dead.
With that much damage to it, you can suck external stuff, rocks, twigs, etc etc in freely
What jets are you running now, I dont think a stock 89-00 GS can use anything larger than a 150 mains or a 40 pilot. I did several O2 sensor runs before landing on 150 in canada in winter no less, and in CA in summer and winter. 152.5 actually results in a loss of about 300 rpm @ WFO under full load. Definitely over the sweet spot. 155 is really much much worse, like over a 1000 rpm loss and worse across the range. The sweet spot is somewhere under 150 but very close, of course colder, humider and denser air can get it feeling lean no matter what.
Cool.
Buddha.

You know I didn't even ask what size he rejetted to. I have been meaning to go back and not only ask him that, but ask him about my NEW PROBLEM!!!

The bike will not go past 6K rpm. At 6k, the bike kind of sputters like its starving for gas or something. It absolutely will not go past 6k. I couldn't go faster than 70 mph on the highway.

Any ideas on why this is happening? (fuel filter in tank, air filter, clogged gas line, jets...) Should the shop owner address this for free?

Oh also, I'm only getting 33 mpg, if that means anything. Geez I wish I had a newer bike lol.

Don't feel too bad- new bikes break all the time too. So it's not a GS specific problem.

Your main jets are most likely too small. Pull the float bowl off and get a mirror and a flashlight. Then report the sizes back here. Either it's the jets, or a fuel filter is clogged, or you have a vacuum problem in the tank.

Quote from: JP86NYC on July 15, 2011, 04:45:30 PM

Quote from: The Buddha on July 08, 2011, 03:07:08 PM
Intake manifold - That is definetly dead ... long dead.
With that much damage to it, you can suck external stuff, rocks, twigs, etc etc in freely
What jets are you running now, I dont think a stock 89-00 GS can use anything larger than a 150 mains or a 40 pilot. I did several O2 sensor runs before landing on 150 in canada in winter no less, and in CA in summer and winter. 152.5 actually results in a loss of about 300 rpm @ WFO under full load. Definitely over the sweet spot. 155 is really much much worse, like over a 1000 rpm loss and worse across the range. The sweet spot is somewhere under 150 but very close, of course colder, humider and denser air can get it feeling lean no matter what.
Cool.
Buddha.

You know I didn't even ask what size he rejetted to. I have been meaning to go back and not only ask him that, but ask him about my NEW PROBLEM!!!

The bike will not go past 6K rpm. At 6k, the bike kind of sputters like its starving for gas or something. It absolutely will not go past 6k. I couldn't go faster than 70 mph on the highway.

Any ideas on why this is happening? (fuel filter in tank, air filter, clogged gas line, jets...) Should the shop owner address this for free?

Sounds like the vacuum line to the petcock is leaking or not connected.Have you tried running with the petcock set to PRI?If it runs better,then there is a vacuum problem with the petcock or it's vacuum line.A plugged fuel cap vent will also airlock the tank as the fuel level drops.

Yes I always ride with the petcock set to prime. It rides great, until it hits 6 rpm.

Quote from: JP86NYC on July 16, 2011, 06:17:01 PM
Yes I always ride with the petcock set to prime. It rides great, until it hits 6 rpm.

Then you experience fuel starvation.The PRI setting has a smaller opening inside the petcock and doesn't allow for full fuel flow like the ON setting.

Quote from: ben2go on July 17, 2011, 04:53:12 PM

Quote from: JP86NYC on July 16, 2011, 06:17:01 PM
Yes I always ride with the petcock set to prime. It rides great, until it hits 6 rpm.

Then you experience fuel starvation.The PRI setting has a smaller opening inside the petcock and doesn't allow for full fuel flow like the ON setting.

WOW, I can't believe I didn't think of that.

Thank you Ben. I guess I should finally install my CRF petcock, as per your instructions:
http://gstwins.com/gsboard/index.php?topic=56352.msg637789#msg637789


THANKS!

If the bike is jetted to maybe 3-4 sizes over the main you need, you will not run past 6-7K and get worse than 33 mpg. The thing is it also will be soft and gutless when accelerating, and possibly smell like gas all the way across.
You also can have a tear in the diaphragm, but there you will rev free past that rpm when revving in idle or in the low gears ... then start to hit a progresively lower and lower rpm wall as your load increases. You can redline in idle, make 10K in 1st, 8K in second, 7 kn 3rd, 6 in 4th, 5th and 5500 in 6th, something like that.
Cool.
Buddha.

wow how can i guy dyno it and miss that

Quote from: JP86NYC on July 18, 2011, 05:44:19 AM

Quote from: ben2go on July 17, 2011, 04:53:12 PM

Quote from: JP86NYC on July 16, 2011, 06:17:01 PM
Yes I always ride with the petcock set to prime. It rides great, until it hits 6 rpm.

Then you experience fuel starvation.The PRI setting has a smaller opening inside the petcock and doesn't allow for full fuel flow like the ON setting.

WOW, I can't believe I didn't think of that.

Thank you Ben. I guess I should finally install my CRF petcock, as per your instructions:
http://gstwins.com/gsboard/index.php?topic=56352.msg637789#msg637789


THANKS!

You're welcome.Check what Buddha posted to be sure it's not the jets or diaphragms too.

Quote from: The Buddha on July 18, 2011, 06:58:27 AM
If the bike is jetted to maybe 3-4 sizes over the main you need, you will not run past 6-7K and get worse than 33 mpg. The thing is it also will be soft and gutless when accelerating, and possibly smell like gas all the way across.

I have a feeling this is it. I had already rejetted to 150 main, and the shop guy told me that he needed to go up in size, which tells me that they are now too big. Couple that with the fact that he told me he ran this on a Dyno, but yet somehow missed the fact that it does not accelerate past 6K rpm makes me think this guy is bulls***ing me.

I will install my CRF petcock, test the max rpm at each gear, do a proper plug pull to see what color they are, and repost with my results. I am hoping the petcock is the issue, but oversized jets seem to be a likely culprit as well.

I really don't want to mess around rejetting the carbs again myself since its running better now (despite the rpm problem) than it ever was before, which really isn't saying much, lol, but overall it still runs decent.

Thanks again for the help guys, I'll report back when I get more info.