Urgent Please Help

[VCHSS4]

I Have A 1990 Ktm 250 Exc. It Has A Severe Low End Bog, Have To Ride The Clutch All The Time On Tight Trails. Has New Boyesen Power Reeds. What Can I Do To The Carburetor To Make It Run Right?

 

[killerbeez 75]

send it to Eric Gorr for the port and polish job.With his prices it seems like that would be the cheapest way to go to get the best performance out of your bike.

 

[Okiewan]

You might want to learn how to jet it properly...

 

[Zoomer]

Does it have any type of Exhaust power valve? sounds like its stuck if it does.

 

[motodr9]

Jetting for new mods/reeds

The Boysen power reeds will change your bikes fuel delivery, usually making it run richer, especially on the main jet. Go to Boysen's website and find a rough starting point/jetting recommendation. But Okies right, your going to have to learn to jet your carb!

 

[2smoke]

Your powervalve may have crapped out. Take it apart clean it replace bearings if necessary. Same thing happened to my 300. All of a sudden it was like a 125. Once you got into the revs it ran OK. But down low nothing and would bog and die.

 

[2smoke]

Sorry just re read the post.....yeah new Boyeson Reeds can affect the jetting...as stated above.

 

[arjay]

How's the compression? Poor compression will give you poor bottom end but still let the bike make normal power on the top.

 

[VCHSS4]

Has great compression a lot of top-end

 

[elf]

If you have good top end your power valve is working or stuck open. If it is stuck open you wont have any low end. If the pv is working then your jetting is off. Check the pv first, if its working then you need to change the jetting.