Tell me more about needles

A reference for the PWK carbs...
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KDXXXX
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Tell me more about needles

Post by KDXXXX »

I'm trying to clean up my KDX's jetting but I'm really struggling to achieve smooth power delivery throughout the rev range.
The bottom end power, according to me, is fine. I have never done a plug chop test to check the main jet, but I'm happy with the top-end power.

The big issue is the mid-range power delivery, it sucks balls!

Now my question is should I change the needle in order to achieve a smoother mid-range? Will I be able to fix the issue by changing pilot/main jets?

I know the bike is jetted too rich because after a long ride with lots of half throttle operation the bike spooges everywhere.
Currently I have a BFQ needle in the bike which I believe is quite a lean needle.
Also running a 38 pj, 152 mj and 1:40 2t mix riding at 4000 to 5000 ft
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Jaguar
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Re: Tell me more about needles

Post by Jaguar »

Here's what needles Jeff Freddette recommends:
'89-'94 R1173N
'95- R1174K & 2AFKQ needle jet

but those are for riding at sea level. You would need even leaner.
Performance CDI -- KDX motocross mods -- the SR KDX -- expansion chamber analysis---> http://www.dragonfly75.com/moto/
cornishwrecker220
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Tell me more about needles

Post by cornishwrecker220 »

200 or 220 ???
KDXXXX
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Re: Tell me more about needles

Post by KDXXXX »

Jaguar wrote:Here's what needles Jeff Freddette recommends:
'89-'94 R1173N
'95- R1174K & 2AFKQ needle jet

but those are for riding at sea level. You would need even leaner.
According to my knowledge, a R1174K is a BFQ needle.
cornishwrecker220 wrote:200 or 220 ???
Its a 2006 200
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KDXohio
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Re: Tell me more about needles

Post by KDXohio »

i have a R1173N in my 90 200
1990 KDX200 FMF Fatty, Answer VFC silencer, VForce 3 Cage, Wiseco Piston, KX125-J series KYB USD fork conversion, Race tech goldvalves, J series front brake assembly, air-box snorkel removed, Acerbis Headlight, KX450F Front fender, Pro Taper RM bend bars, ASV front Brake lever, MSR Clutch perch and lever, RB Head mod, 36mm PWK carb, Trail Tech Kickstand.
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