rm carb question

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9/17/2017 9:19 AM

Would a rm250 carb work on a rm125? The 250s use kehin and the 125s use mikunis but they look very similar to each other, I'm not sure on specs though.

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9/17/2017 10:34 AM

It would work, but not that well. And I bet it would be a lot of work to make it work well!

I ran a pwk Kehin non power jet carb and it needed a really rich slide.

Save your self a lot of time and money and get the stock carb setup or replaced

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9/17/2017 10:57 AM

Bruce372 wrote:

It would work, but not that well. And I bet it would be a lot of work to make it work well!

I ran a pwk Kehin non power jet carb and it needed a really rich slide.

Save your self a lot of time and money and get the stock carb setup or replaced

I wish I could find one so I don't have to just buy a lectron!

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9/17/2017 11:18 AM

Bruce372 wrote:

It would work, but not that well. And I bet it would be a lot of work to make it work well!

I ran a pwk Kehin non power jet carb and it needed a really rich slide.

Save your self a lot of time and money and get the stock carb setup or replaced

zac_k3 wrote:

I wish I could find one so I don't have to just buy a lectron!

Keep checking eBay

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9/18/2017 5:41 AM
Edited Date/Time: 9/18/2017 5:42 AM

zac_k3 wrote:

Would a rm250 carb work on a rm125? The 250s use kehin and the 125s use mikunis but they look very similar to each other, I'm not sure on specs though.

What do you want the 250 carb for?

In the past I bored the 125 carb for more top end and less bottom end on a massively ported cylinder for a VERY GOOD rider. Very different jetting you had to figure out too.

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9/18/2017 7:17 AM

The stock carb on the 04+ works extremely well. I haven't got the time to test and adjust jetting these days, so used the JD jetting kit and it was perfect straight away in the UK using 99 octane pump fuel (32:1 Castrol A747) at sea level.

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9/18/2017 12:18 PM

Bruneval wrote:

The stock carb on the 04+ works extremely well. I haven't got the time to test and adjust jetting these days, so used the JD jetting kit and it was perfect straight away in the UK using 99 octane pump fuel (32:1 Castrol A747) at sea level.

funny you say that.. I just found a 04 carb on eBay. will it bolt right up to the 06?

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9/18/2017 12:37 PM

Bruneval wrote:

The stock carb on the 04+ works extremely well. I haven't got the time to test and adjust jetting these days, so used the JD jetting kit and it was perfect straight away in the UK using 99 octane pump fuel (32:1 Castrol A747) at sea level.

zac_k3 wrote:

funny you say that.. I just found a 04 carb on eBay. will it bolt right up to the 06?

yes it will, but it doesnt run a powerjet like the 06rm125 does.

It should work OK, but you might have to work to dial it in.

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9/18/2017 1:29 PM

I forgot about the powerjet. I think it was 2005 that they came with that. Here's a picture of one of my RMs which shows it (black plastic sensor is the TPS I believe):

Photo

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9/18/2017 5:39 PM

So what's everyone's opinion, should i buy the 04 carb or go the lectron route? The thought of no jets has me wanting to go with the lectron but the stock carb price has me thinking it's the better option.

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9/18/2017 9:21 PM

zac_k3 wrote:

So what's everyone's opinion, should i buy the 04 carb or go the lectron route? The thought of no jets has me wanting to go with the lectron but the stock carb price has me thinking it's the better option.

I personally would hold out until I found a stock 05-08 powerjet carb

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