SR250, get me close to the ton

maloburro

New Member
I found this 1981 stock SR250 last year and updated the cosmetics on the cheap. Now I’d like a little more power. I started riding it to work which is 13 miles with hills on 55-65 roads.

I know a lot of you on here have modded these. I’m just wondering if anyone knows of a basic header swap. I’ll probably just drill out some holes in the air box for breathing. Otherwise a bigger front or smaller rear sprocket.

If anyone has any experience with these please comment.

Thanks

Ryan

I
IMG_5038.JPG



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maloburro

New Member
Thanks Wrench. Yes he is awesome, I have seen his stuff and may need a few of his bits. I was hoping to find some easy swaps and do this on the cheap.

It’s the shipping that kills it but I guess I should suck it up.


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wrench85

New Member
His stuff is well engineered and tested. Makes it easy. You can make a new header, or cut it into pieces and cut out the inner pipe and weld the outside back up. And holes in the air box would help it breath easier. Definitely better than a cheap pod directly on the carb. Constant velocity carbs like having long intake tracks. The smoother the air is the better. Just remember, any little change in intake or exhaust will require tuning the jets. That’s where Jadus high prices come in. He’s done the hardest part for you already.


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maloburro

New Member
You’re right. And I believe in supporting people who specialize in a niche market. Between the shipping and the exchange rate it just kills it but then again, it’s a fun bike with no payment.

Ok. I guess I’ll bite the bullet and look at exhaust and see what he recommends for the carb. I’d also like to do a sprocket change to help with top end.




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pidjones

Over 1,000 Posts
You’re right. And I believe in supporting people who specialize in a niche market. Between the shipping and the exchange rate it just kills it but then again, it’s a fun bike with no payment.

Ok. I guess I’ll bite the bullet and look at exhaust and see what he recommends for the carb. I’d also like to do a sprocket change to help with top end.




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It would help to know your location. Someone might be fairly local or know of nearby sources. Update your profile so it can be seen.
 

porcelanowy

New Member
Hello brother in arms :)
This 1981-one is mine as I bought it:
OdlIDhE.jpg


And like you I am doing changes on a budget :)
A1hpD0G.jpg


Any changes to intake (and exhaust) and you should tune the carb.
I am working on 3D printed slip-on filter that looks like velocity stack and replaces the airbox (it would be a while till I am done – no time for hobbies now).

p.s. That seat – what is it and was the installing process difficult?
 

maloburro

New Member
Thanks. I’ll update. I’m in sacramento Ca area.

The seat was a cheapie I bought off eBay for $25. The front tab slides under the tank, I drilled into the plastic fairings under the seat and attached the back of the seat that way, and the very back drops right in front of the black tab.

It was much easier than I thought it would be.


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