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PostPosted: Wed Apr 11, 2018 9:18 pm 
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Joined: Thu Sep 29, 2016 4:32 am
Posts: 615
Location: Indianapolis, IN
Weather finally got warm enough here to go for a couple of rides. Was really rich in the midrange mostly. I had the needles all the way up, clips on the bottom, so I moved the clips to the second from top notch. That got it pretty close. I now think the top end is a little rich, I have 260 mains in it so will get some 250 and try those. The forks with emulators seem good, wasn't really concentrating on those, but when suspension does not remind you it's there, it usually means it's working pretty well. Need some longer rides with a little warmer weather. So good to ride it again, been almost 6 months since, had a pretty long winter here.

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1974 Kawasaki H2B 750, 1981 Yamaha XV750 Cafe, 1986 Kawasaki KDX200, 2003 Honda XR100, 2004 SDG140. 2006 Ninja 500R Turbo intercooled fuel injected.


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PostPosted: Sun Apr 15, 2018 5:55 pm 
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Joined: Thu Sep 29, 2016 4:32 am
Posts: 615
Location: Indianapolis, IN
Dropped the needles one more notch to the top clip, and leaned the idle mixture screws a bit more. Got a nice crack sound to the pipes now. Throttles so much nicer down low than the stock VM30 carbs did. Rides off from a standstill and has better bottom for sure, and I have a 16 tooth front sprocket so it helps there. Midrange torque got stronger as well. Have not had a chance to wind it out hard yet, I think the leaner needle position made the top end about right, will see.
Think I will enlarge the slow speed fork emulator bleed holes a touch, it's not quite as plush on bump as I want, probably also give them some more spring tension to move the high speed damping up a bit.

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1974 Kawasaki H2B 750, 1981 Yamaha XV750 Cafe, 1986 Kawasaki KDX200, 2003 Honda XR100, 2004 SDG140. 2006 Ninja 500R Turbo intercooled fuel injected.


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PostPosted: Sat Apr 28, 2018 8:48 pm 
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Joined: Thu Sep 29, 2016 4:32 am
Posts: 615
Location: Indianapolis, IN
I went from 260 main jets to 250, that seems about perfect, but it was a bit cool out today, so might need to go to 240 with warmer weather soon. It has some surge when the motor isn't fully warmed up, and being cool out, I think the midrange will still be too rich, so, damm it, I will have to buy some needle jets at around $16 a piece. But at least then I have a chance to get the needles back to the mid clip position instead of down all the way and no adjustment left. But the forks with the emulators in them, wow. We have bad 'road heaves' around here, where the pavement joins and heaves almost a speed bump up. The high speed valve on the emulators just blows open and you hardly notice them, very impressed with those.

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1974 Kawasaki H2B 750, 1981 Yamaha XV750 Cafe, 1986 Kawasaki KDX200, 2003 Honda XR100, 2004 SDG140. 2006 Ninja 500R Turbo intercooled fuel injected.


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PostPosted: Tue Jun 05, 2018 8:50 am 
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Joined: Thu Sep 29, 2016 4:32 am
Posts: 615
Location: Indianapolis, IN
I went from stock 389 Q2 needle jets to P6. Was what it needed to lean the midrange out, but sadly, not enough. I have the needles at position 4 right now and it's still not as sharp in the mid. So crap, have now bought some P2 as I really want the needles in about the mid clip position, at least not all the way down anyway. The TM34 start out really rich stock, I'm betting even too rich for a modern 2 stroke, probably for a safe start on jetting for a new carb, but it gets expensive to go through sets of needle jets to get it right. I have #40 idle jets (#50 were what they came with!) and the screws at 2.125 turns out, so might even go to 37.5 for those. Have found the TMs are really sensitive for idle mixture settings, and the 38s I have on my XV750 even more so with their smooth slide bottoms. Nice that you can change the needle jets without having to remove the bowls though. There are no different slide cutaway options for the TM34, but I realized that you can easily machine the rear edge of the slide to richen the cutaway, or the front to lean it, so will see how that is when I get the needles right.

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1974 Kawasaki H2B 750, 1981 Yamaha XV750 Cafe, 1986 Kawasaki KDX200, 2003 Honda XR100, 2004 SDG140. 2006 Ninja 500R Turbo intercooled fuel injected.


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PostPosted: Tue Jun 05, 2018 3:51 pm 
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Joined: Thu Jun 16, 2011 10:19 am
Posts: 191
Location: Wellington, Fl
I ended up at O-0 NJ's on my TM34's before I went to the VM 38's. Could have gone leaner if smaller NJ's were available. Wasn't happy with TM's as they run too rich. I have amassed quite an assortment of 389 NJ's, your welcome to borrow some if you like, they do get expensive...... :D My final jetting is on the jetting thread, considerably leaner than you.


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PostPosted: Tue Jun 05, 2018 4:21 pm 
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Joined: Thu Sep 29, 2016 4:32 am
Posts: 615
Location: Indianapolis, IN
Thanks for the offer. My original VM30s, I had to go two sizes richer on the needle jets, and then lift the needles to position 4, also went to 112.5 mains to get it right. These chambers have a lot of length and volume for better midrange, and it shows on the fueling it needs. You are absolutely right, the TM34s run really rich out of the box, but will be great in the end, it's close now.

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1974 Kawasaki H2B 750, 1981 Yamaha XV750 Cafe, 1986 Kawasaki KDX200, 2003 Honda XR100, 2004 SDG140. 2006 Ninja 500R Turbo intercooled fuel injected.


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PostPosted: Tue Jun 12, 2018 9:30 am 

Joined: Thu Mar 10, 2016 5:06 am
Posts: 41
Location: Martinsville IN
DGA , I believe I saw your bike at the Steer Inn bike night last Thursday, very nice bike sir.


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PostPosted: Wed Jun 13, 2018 8:19 am 
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Joined: Thu Sep 29, 2016 4:32 am
Posts: 615
Location: Indianapolis, IN
Thanks, yes it was there, I always ride one of my bikes to that if I'm in town. Nice bunch of guys there.

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1974 Kawasaki H2B 750, 1981 Yamaha XV750 Cafe, 1986 Kawasaki KDX200, 2003 Honda XR100, 2004 SDG140. 2006 Ninja 500R Turbo intercooled fuel injected.


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PostPosted: Thu Jun 21, 2018 9:10 pm 
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Joined: Thu Sep 29, 2016 4:32 am
Posts: 615
Location: Indianapolis, IN
I have the idle mixture screws at 2 1/8 turns open and I think it's a bit lean. One thing is after the bike sits for a few hours on a warm day, it needs choke to start again. Well, a few weeks ago I flooded it on the choke, figured I was still learning what these TM34 carbs want and how to start the bike now. So, to start it when the motor really isn't cold, takes choke, it will start first kick without but then won't throttle at all and dies. Not how it should be. So I use choke and kick it again and it floods in about 3 seconds of choke. Then have to kick it with some open throttle to clear it to get it to go, might take 6 or 8 kicks. Not good and certainly not right. I get looking at the parts list for the TM34 and realize that they actually have removable starter jets down the choke well in the bowls. These are a VM17/1002, range from 20 through 100 in increments of 10. I figured that, like every single other jet setting on these carbs stock, they were way too rich. Sure enough, it has #80 in it! WTF, these are only 34mm carbs. So I have ordered some #40 for it, will add those when I put the new leaner P2 needle jets in.

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1974 Kawasaki H2B 750, 1981 Yamaha XV750 Cafe, 1986 Kawasaki KDX200, 2003 Honda XR100, 2004 SDG140. 2006 Ninja 500R Turbo intercooled fuel injected.


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PostPosted: Fri Jun 22, 2018 1:15 am 
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Joined: Tue Jun 07, 2011 6:37 am
Posts: 10460
Location: Rio Rancho, New Mexico
Factory range for the air screws is 1 1/2 to 1 3/4, so you are blasting a lot of air to lean the pilots out, and probably part of the problem.

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Twist the throttle, tilt the horizon, and have a great time. What triples are all about...........


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