2009 EXC 400....silly problem, need advice

Bounce

Bounce

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So....bike starts nicely on the choke; let it run for a couple of mins, push the choke in and it conks out and won't start (unless I open the choke again).

> Fresh fuel in the tank
> Fuel tap is on
> Battery appears to be fully charged

I haven't ridden it for ages, but the battery has been on charge & the charger indicates it's good (umm...could the battery actually be a bit goosed?)

As it hasn't been ridden for ages, so should I start it on the choke and let it run as such for longer, say 5-6 minutes?

Any advice appreciated.....:confused:
 
I think you will have a Keihin MX-FCR 3900D carb - Sounds like a blocked jet/passage, probably due to stale fuel/lacquer.
 
squibb34 said:
I think you will have a Keihin MX-FCR 3900D carb - Sounds like a blocked jet/passage, probably due to stale fuel/lacquer.
Click to expand...

I'd go with the carb.

Miss my 400, best EXC I've ever had.
 
I'll get the carb cleaned out, empty the float chamber etc and see if that works.
 
I don’t know the bike but a trick I sometimes use for engines that haven’t been started for a while is if they will start just leave running for about 20 minutes or so. Usually that sorts out the lawnmowers ect. JJH
 
squibb34 said:
I think you will have a Keihin MX-FCR 3900D carb - Sounds like a blocked jet/passage, probably due to stale fuel/lacquer.
Click to expand...

+1, if it was the tap or filter it wouldn't run on the choke. Sounds like the choke is providing fuel whereas the normal route is not.
 
Daft question....would a heavy dose of fuel system cleaner provide the ultimate 'flush' through? :eek:
 
Jets need a clean, stale fuel gummed them up. I'd suggest pilot more than main, as the choke bypasses it. Fuel flush may cure it, but taking it apart and blowing through with carb/brake cleaner certainly will.
Mark
 
See if you can get all the jets / floats and needles out,

and ask your local indy garage or engineering place, if they can assist with the use of an ultrasonic cleaner & airline for an hour or so

that should free any residual shit out
 
Bounce said:
So....bike starts nicely on the choke; let it run for a couple of mins, push the choke in and it conks out and won't start (unless I open the choke again).

> Fresh fuel in the tank
> Fuel tap is on
> Battery appears to be fully charged

I haven't ridden it for ages, but the battery has been on charge & the charger indicates it's good (umm...could the battery actually be a bit goosed?)

As it hasn't been ridden for ages, so should I start it on the choke and let it run as such for longer, say 5-6 minutes?

Any advice appreciated.....:confused:
Click to expand...

I had the same problem with my WR250, caused by the fuel.

I added Sea Foam (https://seafoamworks.com/product/sea-foam-motor-treatment-oil-fuel-additive/) and it did the trick. Get it from Amazon, I think, about a tenner. Worth a try before stripping everything down, maybe.


Sent from my iPhone using Tapatalk
 
JohnnyBoxer said:
Ok
Point taken
I always drain my carb bikes, after usage
This new fuel is rubbish at gumming up stuff
Click to expand...

Well 20 years ago when I had XRs they wouldn't start unless you filled the carb with fresh fuel.
 
Nippy Normans supply Touratech, Wunderlich, Desert Fox and many other makes of accessories.
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