robert0762 Posted December 12, 2009 Report Posted December 12, 2009 I ride mostly trails have pc pipes. the carbs I am looking at are bored out to 29 mil. I am just wondering if they would be too big or not? Also i am planning on getting a 4 mill crank and mx port by by hjr very soon. let me know what you guys think Quote
robert0762 Posted December 12, 2009 Author Report Posted December 12, 2009 Also what is the diff between the thailand keihin and the other one? Is the one with the round screw top better then the one that has a metal plate on top with the screws in it? Whats the diff old and new or is one a knockoff? Quote
AKheathen Posted December 12, 2009 Report Posted December 12, 2009 well, i can tell you that you will really enjoy those carbs. i just bolted on my bored out mikuni 28's las night.....just shy of 30mm. they are for my 4mill, but i couldn't wait, and they run pretty nice i'll et you know how they run after the trip.... Quote
jbooker82 Posted December 12, 2009 Report Posted December 12, 2009 I believe both the keihin pwk 28mm and the knock off 30's have a flat plate with screws. Keihin pwk 33's and up have the screw on round cap. Quote
volcrano Posted December 12, 2009 Report Posted December 12, 2009 Also what is the diff between the thailand keihin and the other one? Is the one with the round screw top better then the one that has a metal plate on top with the screws in it? Whats the diff old and new or is one a knockoff? the difference is internals are dirrerent.body is the same except for a vent is missing on the right side of the body.i dont know if it would be worth it to save the money on the thailands because the mains are different-just not sure how that setup is.i had busted the body on my 28pwk and replaced just the one with the thailand one.outside looks the same-actually,the cap is built much stronger and comes factory with METAL idle screw.the slide was not chrome plated tho-nut i seen on ebay where i got mine that they have a "racing" one that is "ported" on the venturi and polished and has a chrome slide.it might be worth that one for the $80 ea. us dollars.i mean $160 for brand new pwks are good!they are knockoffs but say keihin and you really cant tell the difference.i changed all my internals from my one i broke to this thailand one.everything fit perfectly and i mean every part had to be replaced.the only thing different to my original pwk is the pilot air mixture screw.in the body of the knockoff-it must not be drilled as deep.i have to have 2 turns out on the original to 1 turn out on the knockof to where they match up perfectly.kinda sucks in that aspect because it leaves less room for slight tuning so i have to get it close to spot with other size pilots instead seeing as i should only adjust them like 1/2 a turn so they dont fall out.ill get it tho-for the money i saved i can live with that.that "racing"one was different tho-the internals might be the same as the orig.but might not too.hope this helped. Quote
bbcmudtruck Posted December 12, 2009 Report Posted December 12, 2009 Carbs are a very important part to the equation so dont go cheap and buy what you need the first time. A 4mil trail bike would love 28s in my opinion. You should try the stock carbs first, you may be surprised on how well they perform. Quote
AKheathen Posted December 12, 2009 Report Posted December 12, 2009 yah, you are right, the stockkers really do perform well with that current setup......but how long you can hold off on changing them is another story, hehehehe.........it really won't be too big to still perform really well from the bottom through overrev, and complement the mx 4mill well. i would also get the coolhead and timing done now with some 20cc domes, so you will have less to spend when you go 4 mill...... Quote
papa_smurf49319 Posted December 14, 2009 Report Posted December 14, 2009 Also what is the diff between the thailand keihin and the other one? Is the one with the round screw top better then the one that has a metal plate on top with the screws in it? Whats the diff old and new or is one a knockoff? Whats that damn nipple right there by the choke for? Do you just plug it? Quote
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