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Posted on 07/29/2010 6:52:37 AM PDT by netmilsmom
To all the Bikers, I'm asking for help.
Netmilsdad got a motorcyle last year. He is having problems with it now and can't find the solution. Any thoughts?
He says...
"Bike runs fine until you idle in traffic for a long time, it will start to misfire and eventually stall if you don’t give it gas. If it does stall, it will start back up. If you are driving, it does not misfire. The radiator was flushed, the back two ignition coils read the same, about 2 Ω’s cold."
If anyone can give us a hint as to what to try next, I would greatly appreciate it.
I put a extra fuel filter on a bike once and, although routed by my genius, it acted like a heat sink and caused vapor lock in the conditions you described. Check fuel lines for improper routing or fastening. Cracked coil is a possibility too.
Dirty Injectors?
Its the crappy ethanol in the the gas
What year VMax? Is the cooling fan coming on? Is it carbed or EFI?
What year is it?
What engine?
What mileage?
Are you running premium gas in it?
Has it been maintained at all by the dealer?
Just a guess but it sure sounds like it is running lean at idle when it warms up.
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Mr MAX has been around for 20 years or so ... The new model came out a year or two ago.. What year is this one?
http://www.yamahamotorcycleforum.com/forum/index.php
I own a 2009 V Star 1300 Tourer, its just a simple V twin, water cooled fuel injected. These forums helped me out with my bike, offhand it sounds like you have a faulty fuel system sensor, like the o2 sensor for starters, and then possibly the fuel processor. On my bike it was factory too lean, I installed an 825K ohm resistor in series with the ground side of the oxygen sensor, it tricks the fuel puter into making the fuel injectors to run richer. A $2 mod.
It’s a 97.
yes the fan kicks on and it’s carbed.
Any fault code?
Also,
If it is Fuel Injected, are the mufflers stock, is the PCV connected, and if not, did anyone mess with downloading a different EFI software, etc setting?
carburated, then my guess is it is set too lean at idle.
It sounds like it’s loading up at idle. This means that it’s getting more fuel at idle than the engine can burn.
It’s been a while since I was a mechanic but I’m assuming most bikes today are injected and someone mentioned a dirty injector and someone else mentioned methanol. Well, they go together. Methanol eats rubber lines and the rubber clogs the injector. I’d think all of today’s vehicles use hoses that can handle methanol, though so I can’t say for sure. Check the fuel filter, too.
Did this happen after a fill up? That could be bad gas with particulates in it, too.
If it has a carb or carbs, I’d check the floats to see if they’re sticking.
When you solve the problem, I’d like to know what it was.
YMMV.
A solution is below:
x.x.x.x.x.
OMG!
Thank you so much everyone.
My DH will be in soon.
Just a shot in the dark but sounds like a stepper motor fault, used to control the idle speed according to revs and idle switch position.
1997.
Thank you all so much!
I just called him and linked the thread.
As soon as he can, he will be in.
Goodness! FReepers are the best!
Float problem is a definite possibility. I had a pinhole leak in one one time and got a lot og flodding at idle which shut down engine.. Also could just be a dirty fuel filter. I had filter probles with tank coating flacking off ad plugging filters which on my Triunph were conveniently (sarc) located in the tank. On a carburated engine gravity feeds the fuel bowl and the float keeps it from overflowing, at idle you should get enough fuel to keep going but in some cases the engine vacume actually helps pull fuel through the carbs. Therefore at idle with low engine vacume fuel may not get pulled through. Idle jets are another posibility, they get gummed up and gas can’t get by but at full throtle no problem with gas flow. When was last time carbs were cleaned/rebuilt?
Id like to ride bouf of them
Sounds like it might be a boiling fuel problem, possibly caused by an ethanol blend. When at idle and stopped, the fuel line might just be getting too hot.
Ethanol in the gas, moisture in the gas tank or a dirty fuel filter maybe? Does the bike get ridden/rode? frequently?
Can you get gas without ethanol where you live?
If carbureted, it may need to be adjusted, cleaned or rebuilt. Check for possible air leaks.
I meant to convey that my installation of the in line fuel filter with the metal case was the cause of my malfunction, not the cure.
I sure hope Son doesn't try everything we all say at once. We would be better off running a raffle and getting him a new bike.
Make sure that the choke is fully seated when closed. If not, you can be overly rich.
Does it have a vacuum petcock?
If it does you are having a vacuum leak of some sort or worse yet your tank is not venting properly.
Has the bike been in storage? How was it running the last time it was put to bed? What, if anything, has been recently done to the bike?
I always start with the simple stuff first. If it’s been sitting for 3 months or longer, drain the gas and change any fuel filter it may have. Fill with new gas, add some Sta-Bil and start over. I might also add an octane boost and change the plugs.
Does your bike have a manual choke... are you sure it’s completely shutting off?
I’m not a motorcycle mechanic, but I have taken care of my own Harley’s for years. If it were me, I would check the simple things first and if I still had a problem, I’d find a Tech Forum for THAT bike model/brand and get the folks that ride them and work on them to guide you through this.
Most bike forums have techs and very savvy folks just waiting to help you out. You should take what some of us say with a grain of salt and then ask the guys that love, work on and ride your brand of bike.
Good luck....
A French mechanical term, meaning "mouse faeces." Carburetter is also a French term; derived fom the "burette" of high school chem lab fame. Ainsi, toujours cherchez les petoulets dans le reservoir de carburetter, s'il vous plait."
And yes, we ought to have Orange County Choppers build the kid a Freerepublic Bike, if they could do so without talking.
I should have just started explaining the first thing you always check is the tickler appliance on your Ducati Scambler's Dellorto.
Buy a Suzuki...
talk to it nicer
The idle may be set too low but I’m not sure if you can adjust it by hand on that model. You could check the pipes to make sure they are seated properly because it could be too much oxygen or too little. On my FXST I put straight pipes on and it doesn’t stall but is sure sounds like it will when idle and it requires more RPM to get torque because of the oxygen. Not 100% sure on this last point but but check the fuel requirements you might be able to put a cup of octane boost to try to flush out the injector and if that works then be sure to use premium gas. Good Luck.!
I thought the Vrod were all fuel injected I could be wrong.
shucks I see now it is a vmax.
Almost definitely a carb problem, and appears to be the float bowls.
Carb overhaul at worst.
I had that problem on a Harley I used to own (Keihin carburetor). The needle valve wouldn't seal properly and the engine would load up. It was exacerbated by the smog regulations that required the float bowl overflow tube to be blocked (I rectified that situation).
Someone else here also mentioned a poorly located fuel filter or fuel lines run too close to a heat source - that is definitely a possible problem.
Learn to live with it.
He’s coming on now!
Or one of the new Triumphs.
Could. Not. Be. Happier.
>>What year is it?
97
>>What engine?
1200
>>What mileage?
29K
>>Are you running premium gas in it?
Yes
>>Has it been maintained at all by the dealer?
After I bought it last year, the dealer I took it to said that was the first time it had been in the Yamaha system.
It’s a 97.
I don’t see how a float or jet problem can be related to heat. It runs OK until about 20 minutes later when it is fully warmed up. I am not a motorcycle mechanic though-
I will pull the plugs and see if more than one is wet. Number one is the V-Boost cylinder and runs dirtier than the other three. I was leaning towards a component on the computer or a coil but could be wrong. It’s a ‘97 with a carburetor, I can’t imagine the ‘computer’ being complex
My mom’s ‘89 Honda and my ‘84 Ranger did this years back. The cause in both instances was the fuel pump needed to be replaced.
>>Has the bike been in storage?
Before I purchased it it sat 2 years. I pulled the tank (PITA under the seat, you have to pull the rear wheel) and got all the gunk out. The shop cleaned the carbs and it ran fine until a few weeks ago. Choke seems to function correctly, its a manual on this bike. Been on the forums, and taking likely suggestions one at a time, I appreciate it.
Like a B-King? Cheaper than a 2010 Max for sure
I increased the idle a small amount (it’s supposed to be 1K) no effect, once completely warm, it sputters
Bttt
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