Frustrated..can anyone help

#1 Reply
Posted by 1986QuadRacer on 08 May, 2013 22:48
carbies is tight, boot is not old or ****? I'd spray a little wd/40 around the intake or jb and see is the revs change. don't use carbies cleaner it might rev up faster than ya want. or ether. pipe is nice and tight?

#2 Reply
Posted by BackRoads on 08 May, 2013 22:55
I tried that and the rpm's stayed the same. Boot is in great shape. The pipe is tight up front but i do notice smoke coming out where the silencer meets the pipe in the middle of it (at start up). No smoke at all up front

#3 Reply
Posted by 1986QuadRacer on 08 May, 2013 23:07
ya that won't matter there. but try to seal it up with a pop can and a couple clamps or something. have you checked the plug idling or at a high idle when it warm to see what it looks like? was the plug chop you did at high speed? did you try a fatter pilot jet? and did the weather change since you did it?

#4 Reply
Posted by BackRoads on 08 May, 2013 23:11
i did a high speed chop, idle chop and a chop after normal riding. all looked good. I went one size richer on the pilot and the bottom end was real sluggish and wouldnt run right. i did the testing in 74 degree weather at 1050ft elevation.

#5 Reply
Posted by BackRoads on 08 May, 2013 23:16
it seems like drastic changes in how it runs with going up or down a size in jetting. if i go to a 50, its hard to start and kicks back...if i go to a 54 it doesnt want to run good at all. Im lost... I dont want to give up on it because its been my dream quad since i was a kid but its getting to me haha

#7 Reply
Posted by 1986QuadRacer on 08 May, 2013 23:46
a little kickback? ya. it's probably the seal on the clutch side. no biggie. I put two in last year;) the first one didn't have grease on it or loctite. you might want to dump the oil and look for rubber pieces or do a leak down. mine was smoking more than usual but you can barely tell.

#8 Reply
Posted by Maxxh2o on 09 May, 2013 00:40
pwk's are hard to dial in on big bores. what elevation are you at. if anywhere near sea level you should be around a 180 main. Check both float vent hoses / circuits and the float levels. I've melted one of the vent hoses on a pipe and it ran like poo till I figured it out.

#9 Reply
Posted by Dwilkins126 on 09 May, 2013 03:12
I have the same issue with mine on a stock TM34SS carb (220 main, 30 pilot, 2nd clip on needle 1.5 turns on air screw) but it only lasts a few seconds. I have it bored to 68mm, uni filter with lid on the airbox, boysen power reeds, FMF Fatty, running 32:1. I am at 55' elevation and the temp today was ~80 degrees. During my break in riding I had the stock 240 main and 3rd clip on the needle at about 70-75 degrees and didn't have the issue but it ran rich. I think I am going to get a leaner needle and try one size smaller on the pilot.

If you or someone else figures it out let us know. I will take any advice to help me figure out the jet settings.

PS: I see you guys talk about squish...can someone enlighten me on what this is please...thanks..

#12 Reply
Posted by BackRoads on 09 May, 2013 04:24
Quote from: Maxxh2o on 09 May, 2013 00:40
pwk's are hard to dial in on big bores. what elevation are you at. if anywhere near sea level you should be around a 180 main. Check both float vent hoses / circuits and the float levels. I've melted one of the vent hoses on a pipe and it ran like poo till I figured it out.
I'm at 1050ft elevation. I'll check everything you mentioned

#13 Reply
Posted by BackRoads on 09 May, 2013 04:29
Quote from: Rider414 on 09 May, 2013 04:00
Get rid of that PWK! So many people have a hard time tuning that carb.
I was really thinking about trying a different carb. Should i go with Mikuni? What size for my set up?

#16 Reply
Posted by BadMoonRacing500 on 09 May, 2013 09:55
Is this a 250 or 500? If it's a 250 the stock mikuni tm34 bored out works good or a stock tm38 from a zilla. If it's a zilla get a Stock tm38 and send it to Jerry Hall to be bored out to 41.5. Keihin and lectrons are notoriously hard to tune. I run Mikuni's on everything but my, 87 250x.

#18 Reply
Posted by Dezsled on 09 May, 2013 16:39
I got a 39 pwk on my 500, no airbox lid 180 main 58 pilot 6.0 slide dgh needle 4th clip down

These carbs work great on trx250rs

#19 Reply
Posted by BackRoads on 09 May, 2013 17:03
Thank you guys for all of the help. Anyone here selling a Mikuni thats already bored?

#20 Reply
Posted by Dezsled on 09 May, 2013 17:24
I was on the look out for one also... But I think I'll be going on flea bay for a new one then send it out to HPR.