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Author Topic: 1974 CR 125 Help  (Read 3056 times)

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mtbrider

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1974 CR 125 Help
« on: November 09, 2010, 11:22:28 pm »
Looking to replace my Bing 84 with a Mikuni. Does anyone have the right specs for this conversion and jetting specs.

Thanks
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Offline Brian Watson

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Re: 1974 CR 125 Help
« Reply #1 on: November 10, 2010, 03:35:09 pm »
G'day mtbrider..back in 1995 when I restored my 1974 125..I contacted SUDCO in the USA about the same subject..here is what they gave me...Oh...I am running a 34mm carb
190 Main
45 Pilot
159 Q-5 needle jet
5FJ9 Needle
3.5 slide
2.0 air jet..

Hope this helps...was pretty spot on for west coast OZ settings..
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mtbrider

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Re: 1974 CR 125 Help
« Reply #2 on: November 10, 2010, 11:35:15 pm »
Thank you for that info.
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SAABCOMBI

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Re: 1974 CR 125 Help
« Reply #3 on: January 25, 2011, 08:00:32 pm »
using a 34 mikini you would have cut the fins on the barrel.
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mtbrider

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Re: 1974 CR 125 Help
« Reply #4 on: February 03, 2011, 10:51:18 pm »
Cut the fins. Yep you are right. But it is a bit worse than that. It is totally unusable. Why do I buy a new Bing at the right price.
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SAABCOMBI

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Re: 1974 CR 125 Help
« Reply #5 on: February 04, 2011, 10:42:41 am »
Where do you buy your bings.
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firko

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Re: 1974 CR 125 Help
« Reply #6 on: February 04, 2011, 10:56:05 am »
www.bingcarburetor.com/
Dave...are you intending changing your moniker from Swedish Connection now that you're soon to be disconnected from the marque? ;)
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Offline Brian Watson

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Re: 1974 CR 125 Help
« Reply #7 on: February 04, 2011, 01:16:06 pm »
Hahaha Firko ..the question has been asked already  :) ... mtb..I have a 1974 CR 125 and did not have to cut the fins....what manifold do you have....if you have the rubber connection (tube) then it is no probs to fit a Mikuni.... the aircleaner elbow fits no probs...and it runs like a startled turtle.. haha...well ......not that fast..
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Offline bazza

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Re: 1974 CR 125 Help
« Reply #8 on: February 05, 2011, 01:29:53 pm »
 firko its now BIKE TRADER CONNECTION
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Once you go black  you will never go back - allblacks
Maico - B44 -1976 CR250- 66 Mustang YZF450,RM250
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mtbrider

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Re: 1974 CR 125 Help
« Reply #9 on: February 06, 2011, 12:27:34 pm »
I have the rubber connection and the carb fits but the choke lever sits nicely between the fins and is useless. So carb useless. How did you fit yours.
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Offline bazza

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Re: 1974 CR 125 Help
« Reply #10 on: February 06, 2011, 12:39:12 pm »
Can you take choke lever off and convert to push down / pull up pin? if enough room?
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Once you go black  you will never go back - allblacks
Maico - B44 -1976 CR250- 66 Mustang YZF450,RM250
Embrace patina

mtbrider

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Re: 1974 CR 125 Help
« Reply #11 on: March 02, 2011, 10:31:51 pm »
Currently waiting on the Mikuni cable operated choke conversion to come (they are used on snowmobiles apparently). They don't sell any cable with them so will need to rig up my own cable. Currently have a lever and cable from my mountain bike that used to operate the lock out on the rear shock which I need to convert to work the choke. Fun times can't wait to get it together to kick it in the guts to see if it goes.
Then it will be fixing the expected jetting problems.
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Offline oldyzman

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Re: 1974 CR 125 Help
« Reply #12 on: March 02, 2011, 10:50:12 pm »
That jetting is for a VM32mm right?????
Brett
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Offline Brian Watson

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Re: 1974 CR 125 Help
« Reply #13 on: March 03, 2011, 08:09:41 pm »
no Brett am using a 34mm
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Offline oldyzman

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Re: 1974 CR 125 Help
« Reply #14 on: March 03, 2011, 08:49:44 pm »
All good re the 34, just wanted to clarify to save someone a bit of time....
Cheers
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I have a soft spot japanese mxers with aluminium tanks. Two stroke classic Dirt Track...
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