Bandit Alley
MODEL SPECIFIC => SUZUKI BANDIT 250 & 400 => Topic started by: fireburster on March 28, 2010, 11:11:10 PM
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Ok got my sprockets and centerstand on saturday. I drove it around and it was great. Then i took it out on a faster road when i was really opening it up. Then it died. I had to ride home idling the whole way. It would start and idle but you give it thottle it die, even when it was driving.
I ran cleaner through the carbs and they had nothing in there. I got plugs but i havent put them in yet. Any ideas?
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Probably running rich. Could be a bazillion things. Without knowing what's been done to the bike it's impossible to diagnose. I'd start with the easy stuff... is the air filter clean? is the choke closing? etc...
Could also be a blocked fuel filter not letting enough gas into the carbs... google running rich and running lean and try to figure out what's going on.
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Sorry about no details. I was in a hurry to post before running out.
I have 3 turns on the mixture screws per the stage one dyno kit. I think its rich since pipes 2 and 3 dont seem to get hot enough. I have to ride with a litttle choke since it doesnt idle queit right yet. Carb sync is on my list but have to plan my repairs around the wife's stares :).
Air filter is ordered, the one in is a little burnt i noticed on the bottom of it. Choke closes and opens fine. When i was dead on the side of the road it would only start with full choke too and just was flooded it seemed. Just throttle full open wouldnt go past 5mph or die. Carbs were cleaned with cleaner and drained. I have no opened them.
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Have you actually opened the carbs and checked everything? 3 turns out could be the source of your problem. I netted out somewhere in the 2 - 2.5 turn area... and yeah I ended up dead on the side of the road at 3 (pulled the air filter and it ran, so thats how I got home)... but I had a slew of other carb issues.
Here's some recommended reading:
http://faq.ninja250.org/wiki/Cleaning_the_carbs_1
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well dyno says 3 turns on their sheet for this setup. They could be wrong. I know 3 sounds like its way overkill compaired to the 2 or what everyone else says.
Yeah i have been reading the ninja faq in bed even latley ;)
ill turn it down to 2.5 and see if that does it.
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I run 3 on my tuned B4- you should run them as the bike needs. Did you strip the carbs or put some kind of cleaner in the fuel?
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I did cleaner in the carb 2 times over the weekend over night for both. Turned the screws back to 2 .25 last night. Road to work fine, but thats only 5 mins. I only really had the issue untill i was out doing 40+mph for longer and really getting on it. Hopefully i can find a road going home tonight to test it on.
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So rode to work fine today. On the way home i was driving along fine then it started to studder. I pulled over and it died. Wouldnt start. Pushed it home the 4 blocks.
So i hook up my hose to drain the carbs see if i can see anything. 1 had little fuel, 2 and 3 were dry and 4 had a little fuel. Switched my petcock to prime and 2 and 3 had little come out then stopped. 4 still hasnt had more then 2 drops drain out.
Petock? fuel line? carb? Im out of ideas.
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Unless the gas tank has been treated it could be pretty rusty. The rust can cause fuel filters / jets to block. Has anybody installed an inline fuel filter? If so take it out. There's also fuel filters attached to the petcock inside the tank. Check and clean. Might as well clean the tap while your at it. The fuel line is 5/8 so I doubt that's blocked.
Could also be the vacuum line on the fuel tap leaking and not opening the diapgram, but seeing you switched it to prime and no fuel was coming out sounds like a blockage or a venting issue...
By now you've probably figured out that these bikes can be a pain in the ass... which is the biggest reason I haven't woken mine up this year.
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I drained the tank and it was fairly clean, didn't see any rust. Petcock filters looked ok also. Guess i will have to look at them again.
There is only one vacuum line on the petcock right? Ill trace that back see if thats all good.
No inline filter but im thinking of installing one.
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Yeah the vacuum line goes from cylinder #1 to the fuel tap. Fuel filter inline is a good idea just make sure it flows well. Hook the fuel line up to and empty container. When set to prime does gas come pouring out? It should. Could also be a tank venting issue...
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Tank venting is a good thought, Mike. When it happens, stop and open the tank. If it's a venting problem, you'll hear a whoosh when you open it.
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Ok thanks for the tips. How would i fix a tank venting issue i guess. I can fix somethings but carbs and kinda over my head.
Seems weird that i drove 3 times and it was fine but once i really get on it and take it over 10k it just starts sputtering out when its coming back down.
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Just make sure air passes through the vent. Could also be a pinched fuel or vacuum line. Check how the hoses are routed.
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will do.
thanks for the help, will post back when i get time to check these things.
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Seems weird that i drove 3 times and it was fine but once i really get on it and take it over 10k it just starts sputtering out when its coming back down.
From most of your descriptions so far, this sound like a fuel supply issue, and the comments from the rest are good places to start...
a) Make sure the petcock is flowing fuel strongly. To test the vacuum on the petcock, you can usually suck on the vacuum hose with the petcock on ON.
b) It's harder to test the tank venting...but you can ride with the tank cap partially open to help identify if this is the problem.
c) Assuming you have fuel flowing strongly from the petcock, then make sure you have fuel flowing from the carb drains. If not, you will have to dismantle the carbs and find out what is blocking the inlets. If you have fuel flowing from some, and not others, then likely there is something plugging or hanging up in the individual carb Float Needle Valve. If you have no fuel flowing from all carbs, then start looking the the fuel line or fuel rail that feeds all carbs.
d) Also, make sure you drain the tank to ensure no water, and start with fresh fuel.
Let us know how you make out.
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Went out last night to work on the bike for a bit. Emptied the tank, looked good. Fuel came out of the petcock great on prime. Filters were clean.
Drained the carbs. 2 3 4 all have good flow, i put the tank back on, carb one no flow. So i assume carb one has an issue.
I started the bike and all the pipes were hot except 1, because it has no fuel. I really dont want to open it, but i cant find that yamaha carb cleaner localy either. Would redline work?
Also is gas supposed to come out the overflow pipe at the bottom of the bike? The hose off the bottom of the tank.
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Is it ok to take the bowl off carb one still on the bike? anything going to fall out?
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Dont think you can get the bowl off with the carbs on as two of the screws are out the back and they are make of swiss cheese- they need to be on a bench or round out.
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I checked today and carb one is draining now. I replaced plugs and air filter. Letting some b12 sit in the carbs today while at the movies. Will post more once I get back out there. What size is the fuel hose? Mine kinda has a kink where it goes on the petcock. Going to put a filter in too.
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Your all inches in the US but the size that Suzi fitted was 8mm bore.
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ran some cleaner through the carbs and now i have good flow. Also noticed that my fuel tank has a kink from the angle off the petcock, fixed that so no kink now. Drove around for 30 mins and it was fine. Still cant get a good idle set but syncing carbs in next.
thanks.
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been riding to work when i can. Everything is running great now other then i cant get it to idle under 2k. If i turn it down under 2k it just keeps falling and dies. No matter if its 20 mins after riding, doesnt like under 2k for idle. 2200 seems to be its spot that it doesnt die when i stop. I havent had time to sync the carbs yet but I have everything ready other then time.
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I think that synchronizing the carbs will solve the idling issue. Also when cleaning the petcock, take the screw out from the valve for reserve and you can clean that out and get a lot of crap removed. My filters were very clean, but when i took that valve apart a lot of crap came out.