Another PJ34 jetting thread

Hmmm, one problem with my earlier musings about this carb is that without using the cable to adjust the idle, all air and fuel for idle has to be pulled through the choke/idle circuit passage because the slide is completely down and seated. Obviously this must be possible to some degree since I CAN get it to idle with the 35 pilot. Seems to defy logic tho, like AWK said.

Test and Tune yesterday: 40 pilot, 160 main, R1368G needle on slot 2, (this is the needle I got locally, might be the same as a CGJ. Local guy said he thinks it is from an ATC 250R)

Screaming top end, goodish low end. Accelerates well. I broke down and adjusted the cable to make it idle. Still think it should be possible to do without the cable, but the next race is Sunday and it NEEDS to idle.

So here's a question for those of you who don't have to adjust with the cable. How is your low end? Will it pull a wheelie easily on dirt, even with an extended swinger? At this point, my semi-stocker has better low end and will wheelie on demand. My racebike won't.
 
royalt67 said:
Hmmm, one problem with my earlier musings about this carb is that without using the cable to adjust the idle, all air and fuel for idle has to be pulled through the choke/idle circuit passage because the slide is completely down and seated. Obviously this must be possible to some degree since I CAN get it to idle with the 35 pilot. Seems to defy logic tho, like AWK said.

Test and Tune yesterday: 40 pilot, 160 main, R1368G needle on slot 2, (this is the needle I got locally, might be the same as a CGJ. Local guy said he thinks it is from an ATC 250R)

Screaming top end, goodish low end. Accelerates well. I broke down and adjusted the cable to make it idle. Still think it should be possible to do without the cable, but the next race is Sunday and it NEEDS to idle.

So here's a question for those of you who don't have to adjust with the cable. How is your low end? Will it pull a wheelie easily on dirt, even with an extended swinger? At this point, my semi-stocker has better low end and will wheelie on demand. My racebike won't.
Click to expand...

my low end is amazing in my book, i will spin thru the first 3 gears on my road and can lift the front like nothing 1st-4th.
 
ive heard a few people hate on vitos reeds, ive never tried em just tossing that out there. i must of bought the nicest 34mmpj ever made lol hold on i will go check what my needle says
 
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Interesting. That is different from stock, aftermarket settings.

I'm starting to think my idle circuit is semi-plugged. The info I'm finding says it should idle with the slide all the way closed. No cable necessary.
 
royalt67 said:
Interesting. That is different from stock, aftermarket settings.

I'm starting to think my idle circuit is semi-plugged. The info I'm finding says it should idle with the slide all the way closed. No cable necessary.
Click to expand...

well i posted a vid of mine a few pages back lol. and thats all choke knob/idle adjuster, no cable involved :) idles like a dream even when out riding the balls off it.
 
Yeah I can't see vids here, but I will take your word for it. I think my idle circuit might be plugged up. Now that I think about it, when I got it it was full of media from like being bead blasted. I cleaned the crap out of it but I bet it didn't all come out. I've sprayed out the passages but that doesn't mean I got it all.
 
It should idle properly without using cable tenson. My old blaster had a 34pj on it. It idled great, but had poor bottom end. It had a toomey pipe, power reeds, no airbox lid, port job and 145 main jet. You had to ride it on the pipe the low end was horrible.

Id try a smaller carb for better bottom end. Try a 30mm You might lose a little off top, but getting it to pull good out of corners with more usable HP is more important than a few peak horsepower, leave that to the dyno queens.
 
I hear you man, and certainly it runs like a raped ape once it gets on the pipe. I just can't accept that a midrange ported motor should have such poor low end with the carburetor recommended by the builder. Especially when a significant percentage of guys have similar mods and good low end. Sure, there could be variations in porting, but damn it, 250Rs, and CR125s ran this carb for years, and I'd like to think at this point my motor is at least in reach of a stock 250R.

I had a long talk today with a guy on E2C about it (never did tell him I was running a Blaster and not a 250R, lol) and he confirmed everything I've heard, even the bad stuff. Still, a stock 250R ran a 48, 155, 1 1/2 turns, with slack in the cable. There is no reason a piped and ported Blaster shouldn't run similarly.

The saga continues...
 
45 pilot, 155 main, 1 1/2 turns out and a DGH needle < she'll pull your arms off,
oh yeah and adjusted idle with the cable,
as the old nike commercial says "JUST DO IT"
 
royalt67 said:
I hear you man, and certainly it runs like a raped ape once it gets on the pipe. I just can't accept that a midrange ported motor should have such poor low end with the carburetor recommended by the builder. Especially when a significant percentage of guys have similar mods and good low end. Sure, there could be variations in porting, but damn it, 250Rs, and CR125s ran this carb for years, and I'd like to think at this point my motor is at least in reach of a stock 250R.

I had a long talk today with a guy on E2C about it (never did tell him I was running a Blaster and not a 250R, lol) and he confirmed everything I've heard, even the bad stuff. Still, a stock 250R ran a 48, 155, 1 1/2 turns, with slack in the cable. There is no reason a piped and ported Blaster shouldn't run similarly.

The saga continues...
Click to expand...


I have a question about your v-force reeds, are you running that inlet director thing that protrudes into the intake boot? I noticed it doesn't fit to well in the larger intake. I looked at that when I first got my vf 3's and decided not too use it. Well I found out it serves a purpose which is to hold in the outer reed pedals. When I was running it like that the low end was very poor because a pedal had completely fallen off.

Just a thought.
 
Good thought musselman, but yeah I have that thingy on. I think I had to trim my manifold for it to fit.

Noober, the stock (aftermarket) needle is a CEG. Yours is 4 steps larger in diameter (same taper and length). This would lean the low-mid and allow a larger main for up top. I might get one of those too. Hopefully my other needles will come today. ( I hate UPS)

And AWK, I hear you man. I hate the idea of having to adjust idle with the cable, but I WILL do it, at least temporarily. It has to idle, I just am leaving that as a backup plan. I will pickup my carb body about noonish. Hopefully it will have soaked out something. Either way, I'm gonna run this carb this weekend. I thought about putting in that 28, hell I think I dreamed about it last night, and as much as I need the low, I don't want to give up the top end. My son is just going to have to make it scream.
 
Royalt I dont have porting or anything, but I didnt give up much top end at all going from a PWK36 down to your PWK28.

However, Ive also been told the PWK series does a better job in the low/midrange than the PJ series.

I think you should give teh 36 a shot when you get it and see if you can get that sucker to run right. Cause it actually had good low end when I was running it, getting the top end tuned was the biotch for me.
 
Well, I have been waiting on it. :) I was actually planning on using it for a theoretical big bore project, but there's no reason I couldn't try it in the meantime.

The reason I got the PJ34 in the first place though was that it is supposed to have BETTER low end than the PWK35. I figured the PWK36 would be too big, but at this point I will try anything.
 
Youve been a champ about this man. I really appreciate it. Youll get your carb and the key real soon.

I gotta run to the yamaha store tomorrow and get a few things. If they have an extra woodruff key in, Im just gonna buy it for you, so you can fix dudes, and yours.

If they have a flywheel key in, Ill get that for you as well. And if you dont like it, tough. Its my way of saying thanks for being so patient with me.
 
hey man, i didn't mean to sell a headache.

if you would've brought it up earlier in the week i would've sent you my 30mmOKO to get you at least through this weekend
 
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