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Old 12-09-2010, 01:38 PM   #1
ZXALAN
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Who here with carbureated bikes are having fuel issues?

Anyone else with carb'd bikes having issues with fuel affecting the carb's performance? Particularly if it sits for a week or so between rides?

I have a buddy with a Bandit 1200 that has had with the carbs this year. The carbs have been cleaned 3 times since July, it will run OK for a week or two after a carb job then act up. He has been putting Sea Foam and Stabil in alternating tanks of fuel but eventually, it starts to act up.

I am trying to determine if this is an isolated case with his bike or what. He rides it often, put 7k miles ok it since June. This bike never had issues in the first 19k miles of it's life up until this Summer.

I'm just trying to see if there is really a fuel epidemic or not. I never had carb problems on any of my bikes but....that was before ethanol.

Thoughts?
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Old 12-09-2010, 02:13 PM   #2
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If he has to have had it cleaned that many times and he rides it that much he either doesn't have a fuel filter or ?

I've put roughly 7+K miles on my new to me scoot since may and only "cleaned" the carbs when I first got it. I do have to rebalance them every few thousand miles though. Usually less then a tiny tweek on the screws to get them all pulling even again.

FWIW though, I do notice a differnce in idle quality/performace from tank to tank or
extreme weather difference with in the same tank of fuel. I'm pretty sure it has to
do with the aditive packages and alchohol amount.

Is he having to "clean" them as in the pilots are pluged or just rebalancing them?
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Old 12-09-2010, 02:16 PM   #3
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it's the ethenol in gas that's throwing the carbs. I would be willing to bet that's the problem.

I konw alot of peeps with older carbed bikes that are having with their carbs becuase of ethenol in gas. They were even told that some shops can't guarantee carb work for more than a week just becuase of ethenol.
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Old 12-09-2010, 02:49 PM   #4
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Quote:
Originally Posted by cedestech View Post
If he has to have had it cleaned that many times and he rides it that much he either doesn't have a fuel filter or ?

I've put roughly 7+K miles on my new to me scoot since may and only "cleaned" the carbs when I first got it. I do have to rebalance them every few thousand miles though. Usually less then a tiny tweek on the screws to get them all pulling even again.

FWIW though, I do notice a differnce in idle quality/performace from tank to tank or
extreme weather difference with in the same tank of fuel. I'm pretty sure it has to
do with the aditive packages and alchohol amount.

Is he having to "clean" them as in the pilots are pluged or just rebalancing them?

The carbs have actually been removed, cleaned, reinstalled/adjusted 3 times since June by a reputable local shop.

The first time we thought was bad gas from a local Conoco station. So it went to the shop, had a full rebuild done and the bike ran much better but still had an annoying glitch/lean surge at 3000rpm cruise. The shop recommended a re-jet. My buddy took it back a few weeks later for the re-jet and the carbs were already gumming up again so they were cleaned again and rejetted. The shop recommend fuel stabilizer and even some sea foam. So my buddy started adding all that stuff, The bike ran fine for a month or two but still had the annoying flutter at 3000rpm at part throttle cruise, in any gear.....he just lived with it and a few weeks later the bike started running BAD....it wouldn't even pull past 7000rpms at wot. So it went back to the shop, they cleaned the carbs again, added a fuel filter and the bike has ran OK for a couple months, now it is acting up again....not as much at wot but the part throttle cruise is sputtering and surging worse and worse down low like the pilot jet is clogging up again. We have a long ride planned for this weekend and I am debating if I should dive into it or not. I have not worked on it yet as he wanted to get his moneys worth out of the shops carb cleanings....it is at the point he is ready to trade the bike in.....Absolutely no reason for this I can think of other then the ethanol....

Just curious if the other 10,000 carbed bikes in Houston are having this issue.
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Old 12-09-2010, 02:58 PM   #5
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My ZZR has carbs, and if I didn't ride it enough it would get clogged up to the point that it would barely run. I got the carbs jetted when I added my slippon and haven't had a problem with it since. It even set up for about 3 months and still didn't have an issue.

Edit: I just glanced over your last post the first time. I don't have a clue what could be the problem if he already had it jetted. Is he consistently getting his gas from a specific location?

Edit: I had a ZR-7S (2001 I think) that I sold to a friend. When they added ethanol to gas he had to get the entire carb system rebuilt to be able to use gas with ethanol in it. How old is the bike?
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Old 12-09-2010, 03:01 PM   #6
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01 carbed r6 - I haven't had a problem at all this year. And I don't ride it very often. Sits a lot more than rides.
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Old 12-09-2010, 03:15 PM   #7
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The bike is a 99. It was rejetted once by Andy at Metric back in 2000. The bike pretty much ran perfect and never had more then a carb sync until this year when my buddy bought it in May from the original owner(who is another friend of mine and he put 19k miles on it). When my second buddy bought it, it ran fine for a couple months, then the issues began. Pretty much around the same time all this ethanol BS began....

Now he only gets gas at new-ish looking Chevron or Shell stations. No doubt the cheap Conoco gas screwed it up originally though...there was a Conoco near his house in Deer Park and it has always had cheap questionable gas. But after a couple carb jobs you would think it would be fine.
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Old 12-09-2010, 03:16 PM   #8
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it's the new gas. wife's old ninja 250 sat for 9 months while she was preggo with the old gas and no issues. when she got ready to get back on I put some fresh gas in and it sat a week and a half before she got on it and by that time the carbs gummed up and I had to pull the carbs and clean them. I made sure to fire it up every couple of days after that.
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Old 12-09-2010, 03:20 PM   #9
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The bike is a 99. It was rejetted once by Andy at Metric back in 2000. The bike pretty much ran perfect and never had more then a carb sync until this year when my buddy bought it in May from the original owner(who is another friend of mine and he put 19k miles on it). When my second buddy bought it, it ran fine for a couple months, then the issues began. Pretty much around the same time all this ethanol BS began....

Now he only gets gas at new-ish looking Chevron or Shell stations. No doubt the cheap Conoco gas screwed it up originally though...there was a Conoco near his house in Deer Park and it has always had cheap questionable gas. But after a couple carb jobs you would think it would be fine.
I make no claims to being a mechanic, but the one that fixed the ZR-7S that I sold said those carbs weren't designed to run on our current fuel. He rebuilt them and as far as I know my friend has not had issues.
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Old 12-09-2010, 03:35 PM   #10
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Everything that has carbs is giving problems if they sit just for a short time in my experience, sux
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Old 12-09-2010, 03:52 PM   #11
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could you give us some insight on this?
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Old 12-09-2010, 04:01 PM   #12
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Mine sat for three weeks this summer, while I was playing army, and I had no issue with it. I wonder if I should change my fuel filter? I don't think they are good for the 47K I know I have on mine.

I ride mine 500+ miles / week, Shell every week day fill up at the same gas station, no additives ever and almost always leave it on reserve (after watching top gear black shadow vs. train and auto). So I really can't comment on the siting up aspect other than my military obligated bikeless time periods.
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Old 12-09-2010, 04:07 PM   #13
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Just talked to my friend and the issue wasn't the carbs getting clogged (my dumbass forgot that I had it jetted) (), it was that the ethanol kept breaking down the seals and it leaked. He's had it fixed twice and it's back in the shop again. Makes me wonder if his mechanic isn't using replacement parts with the old specs.
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Old 12-09-2010, 04:12 PM   #14
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Its a shame that fuel is wrecking these old carbed bikes..... What about Harleys? Look how many carbed Harleys are still on the road? hundreds of thousands....are they having these issues? Who knows....

I know I have a carb on my Vette and I have no issues what so ever...even if it sits for weeks/months on the same tank.....Granted the jets are much larger, the oriface holes in the metering blocks are just as small if not smaller, and there is many of them...like the size of a pin head....I've had this carb apart several times for tuning and never a spec of anything in it.....Its been running for a year, right in the height of this ethanol stuff....

I do know that the Mikunis on B12s have really small pilot jets, and that is likely the jet that is plugging up first, magnifying this problem.
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Old 12-09-2010, 04:50 PM   #15
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I have had to clean the carb on my CRF150F three times this year. Last time it was only sat for one week, with the gas off, and the main jet had a fuel film in it that was paper thin, but a 100% clog. My DRZ I've had to clean it once this year already and the pilot is gummed up, I can tell by the long time I have to keep it half choked as it warms up. I definitly blame the ethanol, since I have no other reasonable explanation.

In the 1980's I rode XR100's for like a decade without ever pulling a carb.
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Old 12-09-2010, 06:35 PM   #16
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I have this problem but it only started a couple of weeks ago. I thought that after four years it was time to change the plugs so I did and that helped but the next morning I was back to the same issue. Bought my gas the week before from Cheveron and THIS started happening. Double checked all of my work and then drained the tank just in case it was bad gas. Got new gas from a shell station down the street and it ran much better but I still have a sputter between 4-5k rpm at partial throttle, wot no issues at all but it's only been a week and a half. Motorcycles Unlimited didn't have a fuel filter for me and told me to go to Autozone so now I have to pull the filter and take it up there and see if they have something that will work.
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Old 12-09-2010, 06:53 PM   #17
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In the 1980's I rode XR100's for like a decade without ever pulling a carb.
Tru-dat...
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Old 12-09-2010, 07:07 PM   #18
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Maybe your friend needs to replace his fuel lines when he has the carbs redone. The fuel lines can have built up on the inside and as soon as the gas flows, some goes into those nice clean carbs.
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Old 12-09-2010, 08:37 PM   #19
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Maybe your friend needs to replace his fuel lines when he has the carbs redone. The fuel lines can have built up on the inside and as soon as the gas flows, some goes into those nice clean carbs.
The shop that has been doing the carbs on it said that there was crystalized fuel gummed up in the bowls and jets.....so in THIS case I don't think its fuel lines..... BUT I have had that problem on my turbo bike once.....an aftermarket fuel line that was only a couple months old started breaking apart and disentigrading, plugging up the screens in my pump...
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Old 12-09-2010, 08:57 PM   #20
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Something doesn't sound right.... sorry.
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