Author Topic: What is a good carb for a moderately built 250R (Read 12395 times)

nick20555 · « **Reply #15 on:** May 29, 2016, 11:45:58 PM »

Dammit, every time I think I've decided which one I want, you guys make me rethink the other lol. Great info. Sounds like I really can't lose either way. I may but end up replacing the bowl on the stock carb (for now) just because I didn't realize you could pick one up so cheap. The stock carb really just needs a new needle and clip (one that was in it was bent somehow), bowl, a rebuild kit, and a couple different main jets (maybe a pilot too). I'll probably pick up one of those 2 carbs down the road though. Gotta try to ride it for a while on what it's got and went it needs it's rebuild then I'll build up the motor. I'll just focus on the cosmetic issues until then.

I need to start my build thread so you guys can see what I'm dealing with. This R was a rescue lol

2ndmoto · « **Reply #16 on:** May 30, 2016, 02:42:37 AM »

Quote from: The_Steve_Man;67915

I prefer the TMX off of a Cr250. I have ran a 38 and 39 pwk. Absolutely amazing throttle response. No loss on the bottom and plenty up top. Once I figured out the jetting, I have not had any problems. I doubt that I will ever go back to a Keihin.

I have not tried the other TM carbs because I have got these carbs so cheap and they just flat out work for me.

I just put on a taper bored tmx and that is a badass carb!

I keep hearing this. What motor are you running the tmx on? I have one I pulled off my cr250. can you pm me some baseline jetting?

F-Red · « **Reply #17 on:** May 30, 2016, 08:49:50 AM »

Welcome to the site. Pickup the A/S and call it a day. Best carb you can run.

The_Steve_Man · « **Reply #18 on:** May 30, 2016, 09:04:18 AM »

The 01 has an s-9 nozzle and needs to be changed to an s-8. The 02 has an s-8 in it. On my mildly ported cylinder, I was at 32.5 pilot, clip in the middle, and a 390 main. On a more aggressive ported cylinder, i ran 430 main.

I have a Bubba Ramsey ported cylinder with a +4 crank and it loves fuel. 35 pilot, s-9 nozzle, clip in the middle and a 440 main.

The_Steve_Man · « **Reply #19 on:** May 30, 2016, 09:09:30 AM »

I have ran this carb on 3 different cylinders without a problem. I'm not saying they are better than a Keihin, but I personally prefer them over a Keihin. I have not used it a big bore, but I wouldn't think that you couldn't get it jetted.

Also make sure that if you buying one that it is a cr carb. I bought one and it was actually off of a yz. They put them on 97 and 98 and look the same but the size is a little smaller. I'm sure it will work though.

Skeans1 · « **Reply #20 on:** May 30, 2016, 09:44:11 AM »

Quote from: The_Steve_Man;67932

I have ran this carb on 3 different cylinders without a problem. I'm not saying they are better than a Keihin, but I personally prefer them over a Keihin. I have not used it a big bore, but I wouldn't think that you couldn't get it jetted.

Also make sure that if you buying one that it is a cr carb. I bought one and it was actually off of a yz. They put them on 97 and 98 and look the same but the size is a little smaller. I'm sure it will work though.

There's also the TM38 off the quadzilla as well and there's some differences in it vs the tmx for the life of me I don't remember the difference between them though. Both you should be able to bore out to 41mm as well.

The_Steve_Man · « **Reply #21 on:** May 30, 2016, 10:57:55 AM »

I am really surprised that there is interest in the tmx carbs. Just a year ago the only help I could get was to throw it away and get a airstriker. But I don't give up and I will help anyone.

Sent from my MotoG3 using Tapatalk

nick20555 · « **Reply #22 on:** May 30, 2016, 01:14:07 PM »

Every time I think I've decided you guys make me think about the other. I don't think I can lose either way though. I think that (for now) I will just replace the bowl on the stock one. I didn't realize you could get them pretty cheap. I'll probably pick up the bowl, a rebuild kit, new needle and clip (old one was bent somehow, not even sure which position he was aiming for), and a few new mains and possibly a size bigger pilot. I'll have to start a build thread soon so you guys can see what I'm dealing with. This R was a rescue lol. For now though I think I'll work on it cosmetically to get it looking decent and just get it running the way it should. Once it's due for a rebuild then I'll start building the motor and pick up one of these carbs. I appreciate all the info that was given to me and I will use it in my decision down the road.

broken1 · « **Reply #23 on:** May 30, 2016, 01:15:18 PM »

Quote from: The_Steve_Man;67935

I am really surprised that there is interest in the tmx carbs. Just a year ago the only help I could get was to throw it away and get a airstriker. But I don't give up and I will help anyone.

Sent from my MotoG3 using Tapatalk

I currently only have Keihin's but will be trying a TMX soon. I think these two carbs bring up a debate much like a Holley vs a Carter/Edelbrock in the car world. I was always told to stay away from Holley in my car days & only ran Carter/Edelbrock but I ended up getting a Holley & now I have a bunch of them & wouldn't run anything else except for maybe a quadrajet.

Skeans1 · « **Reply #24 on:** May 30, 2016, 03:07:35 PM »

Quote from: broken1;67939

I currently only have Keihin's but will be trying a TMX soon. I think these two carbs bring up a debate much like a Holley vs a Carter/Edelbrock in the car world. I was always told to stay away from Holley in my car days & only ran Carter/Edelbrock but I ended up getting a Holley & now I have a bunch of them & wouldn't run anything else except for maybe a quadrajet.

If you do Kevin let me know I'm pretty sure I still have some smaller main jets in my toolbox you're welcome to try.

RIDE-RED 350r · « **Reply #25 on:** May 31, 2016, 09:11:59 PM »

Quote from: broken1;67939

I currently only have Keihin's but will be trying a TMX soon. I think these two carbs bring up a debate much like a Holley vs a Carter/Edelbrock in the car world. I was always told to stay away from Holley in my car days & only ran Carter/Edelbrock but I ended up getting a Holley & now I have a bunch of them & wouldn't run anything else except for maybe a quadrajet.

I think this is spot on.

I had Ski-Doo sleds that ran TMX's if I'm not mistaken and they never gave me any trouble. Granted, I never got into modding them the way I have with my R, so jetting changes were rarely needed. Mikuni has been around a long time, and for good reason. No hate for Mikunis here...

I just have had very good results with my Keihins on my Hondas and never had a need to look elsewhere

flynbyu · « **Reply #26 on:** June 04, 2016, 11:43:27 AM »

I have ran a 38 Keihin A/S on both my sons 250R and also on my 330R for quite a few years and have always been satisfied with that carb. Over the past couple of years a friend of mine suggested I try his Mikuni 38 TMX carb. Finally I decided to give it a try. It did take a little bit to get it dialed in but I found the TMX Mikuni did help with a better low end power with my particular setup. I ended up recently switching to the 2001 CR 250 Mikuni TMX and just love it. I have always taken notes on the jetting of both our quads with the Keihin for all 4 seasons of the year that we have here in Wisconsin. If you do decide on the Mikuni carb, the one to get according to Eddie Sanders is the 2001 CR 250 one directly from Honda. The part number for that carb is... 16100-KZ3-L12. It comes with a 420 main and a 35 pilot both of what were rich in my ESR 330. The needle 676BBH173 was spot on in the center clip position. Regardless of whether you choose the Keihin or the Mikuni take the time to keep notes on your jetting until it becomes second nature.

aztecgwynn · « **Reply #27 on:** June 04, 2016, 05:59:15 PM »

38 mm Air stryker very good carb for top end dune riding but only issue with them is installing it so don't know if you want to tackle that small problem. 38MM is not a bolt on it will cause a bit of a headache at first, but you would have to mill intake bell don't have to but recommended leave intake boot out in sun to make plyable maybe buy a reed spacer + gaskets to get proper angle to fit carb.
Stock style Honda CR 500 PJ carb also good but not as good as air stryker but you may have same issues all apps differ. So it all depends what you want to do what issues you want to tackle and what you don't want too. Stock PJ carb very good but will not give you top performance of big HP as others but they are reliable and parts readily available.

christph · « **Reply #28 on:** June 04, 2016, 06:14:34 PM »

Quote from: flynbyu;68075

I have ran a 38 Keihin A/S on both my sons 250R and also on my 330R for quite a few years and have always been satisfied with that carb. Over the past couple of years a friend of mine suggested I try his Mikuni 38 TMX carb. Finally I decided to give it a try. It did take a little bit to get it dialed in but I found the TMX Mikuni did help with a better low end power with my particular setup. I ended up recently switching to the 2001 CR 250 Mikuni TMX and just love it. I have always taken notes on the jetting of both our quads with the Keihin for all 4 seasons of the year that we have here in Wisconsin. If you do decide on the Mikuni carb, the one to get according to Eddie Sanders is the 2001 CR 250 one directly from Honda. The part number for that carb is... 16100-KZ3-L12. It comes with a 420 main and a 35 pilot both of what were rich in my ESR 330. The needle 676BBH173 was spot on in the center clip position. Regardless of whether you choose the Keihin or the Mikuni take the time to keep notes on your jetting until it becomes second nature.

I remember seeing this version of the TMX on Eddie's website but I never could find it until now. It's different than the one you'll get from Niche Cycle Supply. Eddie doesn't have them listed on his website anymore. I wonder why? It looks like you can still get them from Honda for around $250.

christph · « **Reply #29 on:** June 04, 2016, 06:15:19 PM »

Quote from: flynbyu;68075

I have ran a 38 Keihin A/S on both my sons 250R and also on my 330R for quite a few years and have always been satisfied with that carb. Over the past couple of years a friend of mine suggested I try his Mikuni 38 TMX carb. Finally I decided to give it a try. It did take a little bit to get it dialed in but I found the TMX Mikuni did help with a better low end power with my particular setup. I ended up recently switching to the 2001 CR 250 Mikuni TMX and just love it. I have always taken notes on the jetting of both our quads with the Keihin for all 4 seasons of the year that we have here in Wisconsin. If you do decide on the Mikuni carb, the one to get according to Eddie Sanders is the 2001 CR 250 one directly from Honda. The part number for that carb is... 16100-KZ3-L12. It comes with a 420 main and a 35 pilot both of what were rich in my ESR 330. The needle 676BBH173 was spot on in the center clip position. Regardless of whether you choose the Keihin or the Mikuni take the time to keep notes on your jetting until it becomes second nature.

I remember seeing this version of the TMX on Eddie's website but I never could find it until now. It's different than the one you'll get from Niche Cycle Supply. Eddie doesn't have them listed on his website anymore. I wonder why? It looks like you can still get them from Honda for around $250.