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Carb choice Duncan PJ35mm or PWK38mm
Posted by
Sparky
on 06 Feb, 2014 08:26
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My question for all of you super Mod minded. I have a 1986 LT250r, just rebuilt with a wiseco piston, FMF full Fatty exhaust, UNI filter.
I picked up two carbs on eBay. A Duncan Racing PJ 35mm and a PWK 38mm. I only bought both because of the prices.
So which is better for my setup? I ride pretty hard in all areas but I don't drag race. I want one that is reliable and predictable?? And does anyone have experience with either? And what are good baseline jetting setups for both?
Thanks for all of the help.
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Is your head modded?? If so u can use the 38 pwk, the pj series sucks! I had one , if your head is stock use the 35pj , it will give u good bottom end , these motors 85-86 are half piston port an reed caged, aka bastard child design. I personally went from a stock motor an carb to a duncan power head an 36 pj fmf pipe to same head with different dome an a flowed 36 pwk = 37 , ported cylinder an in frame mhr pipe , that pj was a piece of turd , when I put my pwk on,what a huge power difference, it all depends on ur motor mods . Or just try each of them.
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#2 Reply
Posted by
Sparky
on 06 Feb, 2014 09:35
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No head work on mine. If I could find one I would buy it.
Was the PJ hard to tune or just a poor design?
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As for your jetting call up Loren at duncan racing he's very helpful , he will set u up with what u need, he will ask u what needle an jets are in both carbs , the jet/needle kits are fairly cheep , or call sudco racing they too can help you.
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No pj is ok.... Its more of a bottom end carb.... Pwk series are much better! Better bottom to top end
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Yes the pwk series are easy to tune than the pj
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#6 Reply
Posted by
Sparky
on 06 Feb, 2014 09:50
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Is the 38mm PWK to big of a carb for my setup?
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Typically when u raise up carb mm's up you need to lower your head cc's to raise cranking pressure, remember ever cc is 10 pounds ( psi) , if I was you , send your head out an have it cut, squish band correction, u will feel the difference, try Dennis at flotek performance , he's great to deal with. You can go with a duncan power head but it costs abt 250 , 100.00 just for the dome, special size.., so send stock head out. Just my .02 .
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#8 Reply
Posted by
Q2W
on 06 Feb, 2014 09:52
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I'd sell them both for a profit and get an 88+ zilla carb 38mm mikuni. Pretty sure you can pick one up for under $100. You can fine tune mikuni's much better than any pwk. just my
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Yes I think as rite now , that pwk is a lil big for ur set up, send ur head out an then use the 38 pwk an u will be glad u did!
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#10 Reply
Posted by
LT250RWV
on 06 Feb, 2014 10:31
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I agree with Q2w . I tried pj 38 then pwk 38 now I have tm 38mm zilla carb. Only took me a hour to get way 10 or 15 hour of tunning pwk. But if you need jets and needles for pwk I have a bunch of them forsale.
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#11 Reply
Posted by
Sparky
on 06 Feb, 2014 10:37
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I emailed Flotek to see if they can help.
Pm me on the jets. Never hurts to have them around.
I wish I had the 1987 up engine, there are far more upgrades for them.
Does anyone have any other performance parts for them? For sale?
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Yeah there's not much aftermarket or performance parts for the 85-86, good pipe , porting , try tony ducas racing reeds, they offer two styles, standard an carbon fiber , get the carbon fiber, u can find them at jl atv products .com , if I'm correct I remember there was a company out here in Cali called 1dirracing they mad a billet reed cage for our bikes, I have one an It did great an still have it on motor. Had bike on a dyno abt two years ago it added 2 hp on my 86, with my set up I'm at 36 hp , stock was like 18 - 19 I believe ...
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#13 Reply
Posted by
LT250RWV
on 06 Feb, 2014 13:47
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I think they were in high 20s
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Maybe 22??
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#15 Reply
Posted by
LT500Kid
on 06 Feb, 2014 16:03
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Hard to find a 88+ carb for less than 100.
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#16 Reply
Posted by
LT250RWV
on 06 Feb, 2014 18:58
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I just bought a new tm 38 for 170 $.
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#17 Reply
Posted by
Sparky
on 06 Feb, 2014 21:01
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Thanks for all of the info guys!
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#18 Reply
Posted by
PCS
on 07 Feb, 2014 17:05
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funny that over on a the 3ww website most seem to hate the tm and swap them out for pwk...
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Mikuni
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