What mikuni carb is this ?

Gravel Scratcher · Post by **Gravel Scratcher** » February 7th, 2010, 1:31 am

Can someone ID this mikuni carb ? , had a bit of a poke around on the net but can't find a pic of this one.

BigSteve · Post by **BigSteve** » February 7th, 2010, 10:46 am

It is a TMXx, from a late model snowmobile or a mx bike. Those D-slides come in a variety of bore sizes and slide cutaways.

Gravel Scratcher · Post by **Gravel Scratcher** » February 7th, 2010, 2:25 pm

Thanks for that

It came with my motor, is it worth playing with or selling it to put the money towards something else ?

BigSteve · Post by **BigSteve** » February 7th, 2010, 2:49 pm

Guys are out there that taper bore them and rework them...

http://www.eddie-sanders-racing.com/osc ... ucts_id=25

IMHO, you are better off selling it and picking up a Keihin PWK 39 or 41...similar idea in the design, much easier to get parts for and tune.

M.F.D.B. · Post by **M.F.D.B.** » February 7th, 2010, 10:34 pm

BigSteve wrote: IMHO, you are better off selling it and picking up a Keihin PWK 39 or 41...similar idea in the design, much easier to get parts for and tune.

Couldnt have said it better my self! Ask Danny Graves about Mikuni carbs...

dannygraves · Post by **dannygraves** » February 9th, 2010, 8:38 am

I will tell you from experience that, yes, you could probably make the bike a little faster with a larger carb, and the mikunis with powerjet can make some serious power, but it will be a tuning NIGHTMARE! I'm been there, ask guys on here how much time I spent tuning my gen-1 with a mikuni tmpro41. I love the carb, but no one else runs it, so there wasn't a safe baseline tune. You could get a PWK, run a 45 pilot, DGN needle and 172 main and it will run. period. the mikuni is a shot in the dark. for example, after lots and lots of tuning I determined that my gen'1 safe tune was a 50 pilot, r-6 needle jet, fm46 needle, 3rd clip, 370 main 100 power. it took me a loong ass time to get to those numbers.

dannygraves · Post by **dannygraves** » February 9th, 2010, 8:38 am

BTW, that TMX was stock on /01+ cr250s

BigSteve · Post by **BigSteve** » February 9th, 2010, 9:46 am

dannygraves wrote:BTW, that TMX was stock on /01+ cr250s

125's have them too, as well as a bunch of the other big 4 MX bikes...

M.F.D.B. · Post by **M.F.D.B.** » February 9th, 2010, 7:44 pm

BigSteve wrote: 125's have them too, as well as a bunch of the other big 4 MX bikes...

Care to share that list?

CR500R7 · Post by **CR500R7** » February 9th, 2010, 8:37 pm

This is also something I was considering wether to use the Mikuni that comes standard on the 07 CR250 or just use the carb that comes standard on the 01 CR500.

So what do you guys say? use the standard 500 carb right?

M.F.D.B. · Post by **M.F.D.B.** » February 9th, 2010, 9:02 pm

CR500R7 wrote: I was considering wether to use the Mikuni that comes standard on the 07 CR250

No, throw it at your prude wife, its the best use you will get out of it...

CR500R7 wrote: use the standard 500 carb right?

without a doubt...

CR500R7 · Post by **CR500R7** » February 9th, 2010, 9:16 pm

I was just thinking the same thing, must be a good idea if 2 or more people are thinking the same idea.

M.F.D.B. · Post by **M.F.D.B.** » February 9th, 2010, 9:25 pm

CR500R7 · Post by **CR500R7** » February 9th, 2010, 9:40 pm

I should of bought a 04 CRF450 so I could throw the whole engine at her.

As that wouldn't be a waste of a good engine, would it?

Also slap her round the ears with the exhaust pipe.

M.F.D.B. · Post by **M.F.D.B.** » February 9th, 2010, 9:46 pm

You should tie her hair to the motor to pin her down, slam-it in her sewer for a few minutes, pop-it out and chili dog her ass, then she will LOVE you forever and let you hit it 3 times a day like mine does...

CR500R7 · Post by **CR500R7** » February 9th, 2010, 9:54 pm

I'm speechless, I don't know what to say to that.

dannygraves · Post by **dannygraves** » February 9th, 2010, 9:59 pm

yeah! feed her the CHILLI DOG!

M.F.D.B. · Post by **M.F.D.B.** » February 9th, 2010, 10:01 pm

CR500R7 wrote:
I'm speechless, I don't know what to say to that.

dannygraves wrote:yeah! feed her the CHILLI DOG!

Gravel Scratcher · February 9th, 2010, 10:06 pm

I don't know a hell of alot about carbs so i checked out Dannys previous posts on the mikuni. i want to sort the carb out pretty early on for this build so i started asking a few Q's to different so called guru's and from what i can tell it really comes down to personal preference for either brand. One thing that was clear though was the Mikuni has more finer tuning options ( hassles

)
Just got my Boysen RAD valve as well and i am still thinking of a 38mm TM pro but 2 minutes later i'm thinking of the Keihin.......

CR500R7 · Post by **CR500R7** » February 9th, 2010, 10:07 pm

I'm still lost for words.

Do like they said use the Keihin carb, decision made for you now you can think about something else.

Then again if you have someone who can tune it for you, use the bloody Mikuni if you really want that carb.

Yeah yeah I know I'm a guttless flip flop.

dannygraves · Post by **dannygraves** » February 9th, 2010, 10:15 pm

seriously, as much as I loved that mikuni, if I built another bike just like it, it would have a 41mm PWK with the mikuni powerjet mounted on the rear. just get a pwk and call it a day. Theres a brand new one for sale on here somewhere

M.F.D.B. · Post by **M.F.D.B.** » February 9th, 2010, 10:23 pm

Dood, seriously, the nature of a 2-stroke makes any more adjustability than a Kiehin has, just a plain waste of time...unless you plan to tune it on a dyno with a but sniffer attached, everytime...

Gravel Scratcher · February 9th, 2010, 10:38 pm

M.F.D.B. · Post by **M.F.D.B.** » February 9th, 2010, 10:40 pm

I always say (just ask Danny) spend more time riding than wrenching and you will be a happy man!

CR500R7 · Post by **CR500R7** » February 9th, 2010, 10:45 pm

OK now he has accepted the Keihin carb, does he need to buy a PWK or is he ok to use the standard PJ carb that came with his engine?

Wether it be bored out or left standard?

BannedCR500Riders.com

What mikuni carb is this ?

What mikuni carb is this ?