This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

04 fe450 (Keihin) stalling when it gets hot

Hi guys,
Another update... Bad news, annoyingly. Still on 165MJ (160 didn't arrive), I lifted the needle to C6, and went out. Felt OK (though I'd say not as good as C5 - less hesitation, but didn't pull so strong), until I joined the other guys for a long, slow, technical trail. Few miles later, bike really hot, my bogging problem reoccurred. I tried adjusting the mixture, to no avail. Give a quick twist, it will bog and stumble every time reliably. I had to go home, again :cry: . When I got home, I tried moving the needle back to C5, to no avail. I even tried C4, at which point it wouldn't idle too well. This is all this on a hot bike.
Out of lack of other options I tried the old 178MJ back in, needle on C6 (though I'd give it a try, now with the AP disabled) - to no avail.
I guess in my previous tests just didn't heat the bike up in the same manner - where do I go from here? Smaller pilot jet? I can get the 38 now, but won't be able to test anything until the weekend after next.

Thanks
V.
 
you may have a diifferent problem from the jetting. this leaves you in "no man's land" i do realise.

can you reflect further on how the bike went?

i'll have look at things with a clearere head tomorrow evening.

regards

Taffy
 
Hi Taffy,

I'm beginning to think that too. The jetting makes a big difference and is worth playing with, as did the disabling of the AP too, but it may not be the root cause of the issue.

The issue is best seen with a quick twist of the throttle from idle - I mean quick, like you're trying to see how easily it revs. If you do it from idle, it just bogs every time. If you don't let the revs drop to idle and give a quick twist, the bog is not there.

Because the riding is almost trial-style, riding off the throttle is quite frequent, and it's very visible there.

I'll try a new coil cable - the one I had was a bit suspect, even though I cut a bit off each end and re-secured.

Thanks
V.
 
ok bigV

are you getting the bog when you rev it in the yard?

what was it like on the trail? bad i suspect?

first of all lift the needle back to c6 and then go test the bike and adjust the PS plus and minus 1/2 a turn and if better one way, go a bit more!

where are those jets you were going to order?

if this doesn't help then i think you need to strip the carb and reverse blow out the air passages especially.

do you still have the rubber 'O' ring on the end of the PS?

i think you'll notice an improvement.

regards

Taffy
 
Hi Taffy,

If I get the bike sufficiently hot, it will do it in the yard as well (like yesterday when I came back from the trail).
On the trail it got so bad I had to turn back and go home - I could not use it. It'd bog and stall all the time. I tried adjusting the PS, turning it out more made it slightly better, turning in made it worse. But if turned too far out, it'd struggle on open throttle, not revving cleanly very high. In any case, I could not get it to stop bogging, no matter what I did to the PS. At one point I even tried to run it on the choke. It seems that as it gets hotter, even idling becomes a problem.

160MJ and 38PJ are on their way... O-ring is present, had the PS out all the way. I cleaned everything with compressed air recently, but will do it again, just to make sure...

Thanks
V.
 
are you saying that it's now worse than the 178MJ. you did say that it was better?

you shouldn't tune the bike in the yard. period!

you sitting on it is the only valid test. what i can't understand is why when you rode it and tried the PS a little in and then a little out it didn't make the bike better or worse?

i had the thinner needle than you but one size doesn't seem enough and anyway, i did scoots bike for him with a DVR and it went like a bloody rocket!

how come going back to standard hasn't improved it?

i'm happy to send you a needle up to jockland and you can try it but i can't understand wht the problem is at present?

it won't be the MJ because all your problems are at the bottom end of the revs.

have you done your tappets lately?

regards

Taffy
 
Hi Taffy,
No, it is better with the 165 overall. But it still seems to get to a stage where the bogging is not much different from the 178. As you say, probably not a MJ issue. One thing I don't understand - I did go for 2 hour ride last weekend, trying to avoid "yard testing", through the woods at a slow pace, on the 165MJ and C5. It became a little hesitant at worst, but much better than before. The only thing I've done before going out this weekend was to raise the needle to C6 to remove the hesitation. Valves were adjusted before going out last weekend.
Don't know what I'm doing wrong...
Cheers
V.
 
do your valves again please.

if you recall i said that you could raise the needle again when the MJ went down. and please remember - which you clearly haven't - that all we were getting better was the bike in 5th and 6th gear. if it's a succes there then i've done my job. MJ first, needle clip second, needle straight third, PJ 4th.

you could go to clip 7 now and you would havew no heisation at all with the correct PS turns BUT the bike would be rich in 4th gear so it's no good doing that.

we need to get the tappets done again and this time give a little extra slack. just a bit more. then the 160MJ and we'll take it from there.

regards

Taffy
 
Will do.
I'm out of the country from Wednesday for a week, but I'll be ready to continue weekend after next.
Thanks for your patience.
Cheers
V.
 
Hi guys,

My (sadly) last update...
When I returned from my holiday, I had a 160MJ and 38 pilot waiting for me. I cleaned everything, readjusted the valve clearances again, put the new jets in, needle at C6. I also put in a brand new HT lead. The bike was running great, best yet, until I heated it up. Same problem. It drove me insane.
I looked around it, and noticed the plug cup was still tracking! I took isolating tape and wrapped it as thick as I could, while still able to push it back in, and tracking disappeared. and so did my bogging! It looked like it was that all along! What a **** for not doing this before!
I went for a test drive, all seemed fine. I played around for ages, no problem, so, happy, I'm heading home. Then I hit a rut and came off. I don't know what happened, but I think my boot got caught behind the plastic (where most other bikes have an airbox). Anyway, my leg got fractured in two places. I waited in agony for an hour before my wife, police, fire brigade and ambulance found me, and spent the next week in the hospital.
The worst of it is, I can no longer go off road. Even when this is fixed, apparently if I break it there again, they will not be able to fix it. Considering how often I fall, the risk is just too great.
I wanted to thank everyone, namely Taffy, for spending their time on this and helping me to find find and resolve the problem. Much appreciated, really.
All the best, and enjoy off roading! (I'll be watching your galleries etc).
V
 
bigV

that's rotten luck mate. i got through the learning period with a lot of luck and had one really nasty one that i walked away from. simply bad luck.

all the best for the future mate

regards

Taffy
 

Similar threads

F
FE570 low idle issue, outside of the usual suspects! (I think)
Replies
1
Views
419
rikschipp
R
D
Start fail , when hot engine fe450
Replies
1
Views
905
cambo
C
A
2008 FE550 hot start
Replies
1
Views
571
Taffy
Taffy
C
FE450 2010 problems. Engine stalling, help desirable
Replies
22
Views
7K
Xabre
X
T
2010 FE 390 stalling
Replies
12
Views
2K
cambo
C

Register CTA

Register on Husaberg Forum! This sidebar will go away, and you will see fewer ads.

Recent Discussions

Recent Discussions