250-500cc 2014 WR250 Carb Question

[Thearvman]

Just bought a leftover 2014 WR 250. Read that it can be picky with jetting. Question is ... replace carb with Keihin or just install JD Jet Kit? Any advice appreciated.
Jason

 

[NCSteve]

Some are happy just jetting the stock carb, some like the Keihen. There's a huge thread stuck at the top of this forum with all the info you could ask for.
I did the jet kit and still didn't like the Mik, decided to go for a Lectron and glad I did. No More Jets!

 

[troy deck]

if you dont like it the way it is just sayit and give kelly the $400 and be happy CANT BELIEVE YOU FOUND A LEFTOVER AFTER THE HUGE FIRE SALE

 

[Thearvman]

Another guy bought a few bikes during the fire sale and then resold some. Price was good. Ok I will check out Lectron from Kelly. I don't have a lot of mechanical skills ... so a Lectron carb after installed is low maint ie jetting or adjusting settings? wow that thread at top is huge. Are Husky bikes hard to dial in or do the riders just want it close to perfection?

 

[troy deck]

ITS A PERFECTION THING

 

[lankydoug]

I have an 09 WR250 and I played with the oem Mikuni until it was as close to perfect in that any change I made made it worse. It worked well from central Missouri to Colorado at 8,000 feet. That being said I then bout a Lectron and within 3 short tuning sessions had it running better in every way including fuel mileage. I'm sure I spent at least $100 on needles, jets and fuel sorting out the Mikuni and in hindsight I wish I had bought the lectron the same day I bought the bike.

My mikuni tuning:

VP110 fuel
Gnarly Pipe
420 main jet
32.5 pilot jet
air screw 1 turn out
GAY needle in 2nd groove with 1/2 step spacer
float bowl well drilled to convert it in to a baffled sump

Lectron tuning:

Needle 1 1/2 turns leaner than delivered
High speed jet 3/4 turn out
Set the idle and haven't touched it in 2 years except if I'm going to ride in sand all day I back out the high speed screw 1/4 turn further for insurance.


If you would like to buy my Mikuni ready to bolt on $100 plus shipping. It's been preserved and put in a ziplock bag on my parts shelf for 2 years.

 

[R-J van Hulst]

this way you will never sell you carb

I have an 09 WR250 and I played with the oem Mikuni until it was as close to perfect in that any change I made made it worse. It worked well from central Missouri to Colorado at 8,000 feet. That being said I then bout a Lectron and within 3 short tuning sessions had it running better in every way including fuel mileage. I'm sure I spent at least $100 on needles, jets and fuel sorting out the Mikuni and in hindsight I wish I had bought the lectron the same day I bought the bike.

My mikuni tuning:

VP110 fuel
Gnarly Pipe
420 main jet
32.5 pilot jet
air screw 1 turn out
GAY needle in 2nd groove with 1/2 step spacer
float bowl well drilled to convert it in to a baffled sump

Lectron tuning:

Needle 1 1/2 turns leaner than delivered
High speed jet 3/4 turn out
Set the idle and haven't touched it in 2 years except if I'm going to ride in sand all day I back out the high speed screw 1/4 turn further for insurance.


If you would like to buy my Mikuni ready to bolt on $100 plus shipping. It's been preserved and put in a ziplock bag on my parts shelf for 2 years.

 

[lankydoug]

this way you will never sell you carb

I figured I'd keep the Mikuni to put back on my bike if I ever sell it, then I can put the Lectron on the next bike I buy. I bet there are hundreds of Mikunis out there cheaper than $100.

 

[lankydoug]

What I don't get is, I have a Mikuni on my 08 yz125 that works great and isn't picky about altitude or weather changes. It does pretty good on fuel and a 1/4 turn of the air screw pretty much takes care of the extreme temp changes and it's bone stock except for a slightly smaller pilot. For what ever reason the Husky Mikuni combo takes a lot of work to line out.

 

[NCSteve]

What I don't get is, I have a Mikuni on my 08 yz125 that works great and isn't picky about altitude or weather changes. It does pretty good on fuel and a 1/4 turn of the air screw pretty much takes care of the extreme temp changes and it's bone stock except for a slightly smaller pilot. For what ever reason the Husky Mikuni combo takes a lot of work to line out.

Funny that, wonder if there are different OEM carb spec's?
Just the starting ritual with mine was enough to justify replacing it. Now easy starting cold and 1 kick warm.
I noticed recently, since the bike doesn't stall when laid down with the Rekluse, the Lectron dumps a serious amount of fuel. I didn't notice the stock Mik do that, but maybe it did too.

 

[lankydoug]

Funny that, wonder if there are different OEM carb spec's?
Just the starting ritual with mine was enough to justify replacing it. Now easy starting cold and 1 kick warm.
I noticed recently, since the bike doesn't stall when laid down with the Rekluse, the Lectron dumps a serious amount of fuel. I didn't notice the stock Mik do that, but maybe it did too.

I think that Yamaha did a better job of matching the needle and the slide to the engine demand. The Husky 125s were really bad until you bought a slide and a Suzuki rm needle.

 

[Thearvman]

I ordered the Lectron from Kelly.
Thanks for advice everyone.