450 v's 501

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Joined
Aug 25, 2006
Messages
68
Location
Melbourne, Australia
Hi all.
Mate & I went riding yesterday on a tight, rutted, root infested track another mate uses for training. It was my 1st ride on the new (old 450) but the interesting part was the back to back comparison with the 501.
When in the real tight stuff the 501 would constantly stall unless the revs were kept up & the clutch was used as a throttle. Very tiring. The 450 would pull cleanly without stalling unless I was silly. So the big question is how do we stop the 03 501 from stalling all the time? Its driving my mate crazy restarting it all of the time.
It seemed to start easy enough on this day but sometimes it just wont fire unless a prayer is made towards Sweden.
I played with the fuel screw (out around 2.5 turns), the valves are good, spark plug was new.
Any clue where to start?

Thanks all.
 
RE: gearing

Assuming that the 03 is stock and the 450 is newer than 03 (04 and up) the 03 has a Dellorto and the 450 has a Keihin carburator. The Dellorto is a bit harder to tune, but look through the doc on the site as well as several threads about the Dellorto carb. You can great results with this set up. I have a 501 with a Dellorto and it is great down low in the rpm in tight conditions. The parts are easy to find as a lot of KTM's use the same carb as well.
 
Does the bike start ok when cold, but a pain when warm? Check to see if the CDI jet is installed underneath the pilot jet. If not, get one; it help my bike's hot starting a lot.
 
After leaning off the Dellorto from standard in my 98 501 the stalling improved but was never really resolved. I found that I could never get a consistent float level no matter what I did with needle and seats. In the end out of frustration I fitted a WR400 FCR 39 and with Taffy's help with jetting the thing is a tractor. The only problem I have with it is cold starting which takes a bit of technique. Pics including FCR jetting specs are in my gallery. I'm sure the Dellorto can run well, but it needs to be right. Dale Lineaweaver can aparently make them good by adapting Keihin bits to suit.

I'd expect that there are heaps of FCR 39s at the wreckers now off 250F MXers just waiting for a Berg...

Steve
 
The best

Thanks for that. I have read heaps of posts but like my 450 jetting questions I just end up confused!
Its my old bike and Ive had a few Bergs so I know they have a few...ahhh "traits". The owner is a bit short of $ so I am trying some simple stuff 1st but its the time mainly.
The valves were checked about 3 hrs ridning ago so they are fine. It seems that if I hold the throttle just off idle and then adjust the fuel screw I can get it real smooth. This trick was told by an older Husky racer that was doing the enduro scene here for years. But it ends up being screwed about 3 turns out!

Thanks again.
 
Have a look at the 'doc', link is to the left, for jetting suggestions. I think there is a Dellortot section there now. Remember though that the float level affects the mixture and must be right for the rest to work.

Steve
 

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