Author Topic: 1982 YZ250J flatslide?  (Read 330 times)

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Offline Jumpit

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1982 YZ250J flatslide?
« on: May 08, 2018, 10:10:24 PM »
G'day all,

I have purchased an TM38 flat slide Mikuni for my '82 YZ250J, the carb on the bike just worn out and too old and i want to give the flatslide a try to see how it goes on the 'flying pig'. I'm running the round slide specs at the moment just to start with but it's predictable that it's sputtering and coughing. I'm curious that since the '82 RM equipped with a flat slide will i be able to use the jetting in this then fine tune it (obviously the Suzuki would be a different motor than the YZ ) :P

Someday you'll own a yamaha

Offline Devondan

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Re: 1982 YZ250J flatslide?
« Reply #1 on: August 05, 2018, 07:56:14 PM »
While not wanting to disappoint you, I?d have bought a lectron, much easier to tune.unless anyone like Motocarb or Allen?s have the spec already.  All you can do is read the mikuni tuning manual and start from there, be prepared to buy lots of jets and prob needles!

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IT  400D - Trail riding
74 Montesa Cappra - Racing
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Offline mboddy

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Re: 1982 YZ250J flatslide?
« Reply #2 on: August 06, 2018, 07:48:08 AM »
You have the TM so you may as well give it a go.
See my post on fitting a TM36 to my IT200 for the process that I followed.,23996.0.html
Seriously consider fitting the power jet kit.
Olav Aaen says replacing a VM with the same size TM you would normally add 4 to the needle jet size.
Tune the pilot setting first. Probably start with a pilot jet 5 smaller than the VM.
Start with a main jet a couple of sizes bigger the VM (unless fitting power jet) expecting it to be a bit rich
and then if it is rich then go down a size at a time until it runs clean on full throttle then do full throttle plug chops to check colour to get it spot on.
Vinduro Penrite Team
1980 IT125G, 1979 IT175F, 1984 IT200L, 1977 IT250D and IT400D