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Old 01-21-2015, 07:35 PM   #1
ScottDR650 OP
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TM40 For DR650

Probably been done a 1000 times already, but I'm new so...

Is the TM40 really worth putting on the DR?
I'm doing a cross Australia ride in June and am thinking of doing the TM 40 from Procycle.
PC looks like they've got it all sorted in he kit, but being in Aus, kit is pretty expensive mod for a modest bike - no offence.

So will the carb provide me more fuel range as well as an improvement in throttle response - need to cover 500+ k's between fuel stops.

Recommendations for suppliers of the TM 40 in Australia.

Alternatively is the PC jet kit worth a try?

Regards
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Old 01-22-2015, 05:58 AM   #2
HunterSon
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Don't have a DR650 any more, but the TM40 made a huge difference to my DR650. I can't remember if it made a difference to the mileage but you could lug the motor around and snap the throttle open without bogging down.
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Old 01-22-2015, 07:37 AM   #3
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Not sure if the FCR will fit in the DR but if it does I'd go that route. My issue with the TM40 is mikuni designed it as a street bike carb and decided to expose the accel pump rod to the outside, very fine dirt manages to work its way around the accordion boot and get in around the accel pump piston often inhibiting its free movement, of course when that happens you might as well have a stock carb for all the accel pump does for you. I've run both and the FCR is a much more refined carburetor, the TM40 is crude by comparison. When the FCR is dialed in correctly it's about as close to FI as you'll get with a carb. The other added bonus is there's plenty available used since they're on almost every carb'd race bike sold in the last 10 years and a good selection of aftermarket parts for them, most dealers will have jets for them also which isn't the case for the larger mikuni jets. There's no shortage of tuners that can bore a 39mm FCR to a 41 or even add keyhole or taper bore to them.
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Old 01-22-2015, 03:03 PM   #4
ScottDR650 OP
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Thanks men, I'll look into the FCR now. What was the Devo song "freedom from choice" I haven't hear much about FCR carbs on DR's but I reckon it won't take much digging.

Regards
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Old 01-22-2015, 03:38 PM   #5
nzrian
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Fcr on dog rooter

Scott, I have the fcr on the DR and love it, if you are in sand or dirt it makes all the difference.

This is a real common mod, have a look in the sticky at the top of the forum, bike specific index, dr650, then carbs.
Other option for info is to search the 100,000 posts in the dr650 thread.
Another option is look on drriders forum and there is a sticky thread on fcr carb conversions, with plenty of aussie specific jetting info


Show and go in Melbourne have jets and carbs, fcr39- mx is the one to get.
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nzrian screwed with this post 01-22-2015 at 04:08 PM
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Old 01-23-2015, 04:35 PM   #6
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Thanks Nzrian that is a great help. The forums on this site are good but the volume is a bit overwhelming.

I'm pretty much sold on the FCR now. Just gotta get on and get one sorted.
"Dog Rooter" love it!
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Old 01-27-2015, 04:42 AM   #7
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with the Mikuni TM40 does screwing the pilot jet screw in clockwise make the idle mix richer or leaner?
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Old 01-27-2015, 06:44 AM   #8
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Quote:
Originally Posted by Perthite View Post
with the Mikuni TM40 does screwing the pilot jet screw in clockwise make the idle mix richer or leaner?
Leaner
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Old 01-27-2015, 07:17 AM   #9
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this is all the info you need on the fcr carb on a dr http://www.mxrob.com/
you cant get a better write up than that. I have the fcr on mine and would suggest it to anyone. if you shop around on ebay you can do it for less that the mikuni.
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Old 01-27-2015, 07:21 AM   #10
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thanks ridefreak, it's just that i read someplace that when the screw is on the air filter side of the carb (like mine is) it controls the amount of air (so turning in would make it richer)
this TM40 doesn't have the accelerator pump either

Cheers
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Old 01-27-2015, 07:22 AM   #11
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Quote:
Originally Posted by ScottDR650 View Post
So will the carb provide me more fuel range as well as an improvement in throttle response

Regards
i doubt it. probably the opposite
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Old 01-27-2015, 08:50 AM   #12
RideFreak
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Quote:
Originally Posted by Perthite View Post
thanks ridefreak, it's just that i read someplace that when the screw is on the air filter side of the carb (like mine is) it controls the amount of air (so turning in would make it richer)
this TM40 doesn't have the accelerator pump either

Cheers

If your screw is on the airfilter side of the carb I don't think we're talking about a TM40. That usually indicates a 2 stroke carb and you're right, turning it in reduces air to the pilot circuit richening it up. Does it have an accelerator pump? Got any pics?

This is the TM40
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Old 01-28-2015, 02:29 AM   #13
Perthite
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a picture paints a thousand words........
my mikuni doesn't look very much like that one except it is a flat slide
it doesn't have the accelerator pump and only has one throttle cable coming out from top centre
it runs fine (not on a DR) except at idle it will blow black smoke when blipped
i will unwind the pilot screw on account it's on the airfilter side of body and that should lean it some
can't take a pic cos the safari tank covers it all except for the float bowl
CHEERS!
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Old 01-30-2015, 08:55 PM   #14
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turns out it's a TM38-85
backed off the air screw and she idles/runs good
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