DR650 Carb Swap (pt. 4) - Tuning the TM40 Flatslide

Tuning the Mikuni TM40 for my stock exhaust.
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Other videos in this series:
Part 1 - Rebuilding the Mikuni TM40 : • DR650 Carb Swap (pt 1)...
Part 2 - Making throat adapters for the TM40: • DR650 Carb Swap (pt 2)...
Part 3 - Installing TM40 and shorten cables: • DR650 Carb Swap (pt. 3...
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If this helped you out and you'd like to show your appreciation, donations are accepted :
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[@whitedrguy6503]

I have ran a TM 40 on my DR for a long time, it works great, very happy with it. It has been on 2 DRs, the first one had the top of the air box cut out and the second had about just another hole about the same size as the original hole cut in it, both worked great with my stain tune exhaust. Now I just run the standard exhaust with the hole covered and the snorkel back in place, the noise of the air box sucking in the air became annoying, with the louder exhaust it was fine but with the standard exhaust being so quiet it was a lot more noticeable. The bike runs perfectly fine still and have never changed any jetting, the TM 40 just seems to pull of the bottom better than the standard carb, a lot more responsive.

[@elliot7179]

Hi any idea what jetting specs you are using ?

[@nicoradv3923]

i re-jetted, cut the whole top out of airbox, blocked the vacuum on the carb (just have to remember to cut fuel off now). 50 to 68 MPG, max speed (GPS) 91 mph. I'm was happy with it. Can't remember what jet size, nor clip position I used.

[@prhannator2874]

Nice video. I have a 21 myself and am considering the TM40 for low end throttle response and smoothness at low RPM. I keep seeing people talk about the header pipe welds being the main issue with these bikes. Every do anything to your header pipe or remove it to confirm these claims?

[@DustinRogersinMO]

I had my header pipe off sometime prior for something unrelated. While I had it off, I did grind the welds a bit just because I know it’s a common thing, but I hadn’t noticed any issues prior to grinding the welds.

[@cnicoletti2]

Hi Dustin. I installed the Procycle TM40 and there’s three vacuum lines that I’m not sure where to hook up. In one of your videos I saw the same three lines. Did you just cork them?

[@DustinRogersinMO]

They are vent lines. Just route them down between the back of the engine and swingarm pivot.

[@davidb5952]

did you bother to use adaptor rings or just were able to clamp the TM40 tight without rings? Looks like the TM40 inlet and outlet is about 2mm smaller diameter than stock carb.

[@DustinRogersinMO]

I made some adapter rings in this video. kzbin.info/www/bejne/q2e4pp-agd-Zm80

[@kyecowen4583]

Guess you skipped the tm40 installation instructions from pro cycle haha, they tell you to cut out the top of the air box and even have a template

[@DustinRogersinMO]

I didn’t buy from ProCycle

[@nsn2vu]

What jet sizes do you run?

[@DustinRogersinMO]

I discuss my jet sizes in the first video of this series at the 10 minute mark kzbin.info/www/bejne/iaKtcn-Nlt1rrsk

[@DustinRogersinMO]

I did change accelerator pump nozzle size in part 5 video

[@nsn2vu]

@@DustinRogersinMO will take a look thanks.