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Old 01-18-2010, 07:10 AM   #1
oc_nightmare OP
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Location: Leiria, Portugal
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Yamaha SR250 Classic

Hi there folks

I just bought a SR250 classic for commuting and doing nice trips on the summer and i'm absolutly loving it because it feels so light (I come from a XTZ750 Super Tenere)

Here it is:


I was wondering if there are more SR250 owners here and as soon as I get a new bike, my mind starts to work real hard to do modifications to enhance the bike, mainly the performance from the engine.
I've already ordered a megaphone muffler and i was thinking on what can i do to gain a little bit more torque on the low and middle range? What engines fit this frame with minor modifications? Would the XT350 one fit? As it is a very oversquare engine i think it is not recommended to go up in the bore, is it? I would be very happy with 350cc SOHC and this bike and this weight but what engine to put there?

If the SR500 was sold here in Portugal or if it wasnt so expensive to bring one here, it would be so much easier


Im sorry for my english
greetings from Portugal
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Old 01-18-2010, 11:30 AM   #2
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Cafe it! Or just ride it.

I dig it
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Old 01-18-2010, 04:38 PM   #3
oc_nightmare OP
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the only thing im thinking on doing about that is to drop the front forks and adding clip-ons

what about the engine, any ideas?
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Old 01-19-2010, 06:13 PM   #4
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no ideas?
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Old 01-19-2010, 07:53 PM   #5
BIG ED XT FAN
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Sr 250

We did not get that sr 250 here in the USA. The bike that came here had a "pizza" box on the back end. No disk on the front end.
A new muffler and some clip-ons for a start. And new paint! Thump-On!!
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Old 01-20-2010, 06:41 AM   #6
JWhitmore44
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You will probably need to search on XT250 to see what people have done to increase performance on those. You might want to check in the thumper section. I think the XT225 was replaced with an XT250 this year. If you have plenty of top end you can go with a bigger rear sprocket, 3 or 4 teeth bigger.

Cool looking bike.
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Old 01-20-2010, 11:09 AM   #7
Inane Cathode
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It's also just a 250, can't expect starship performance from it.
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Old 01-20-2010, 11:24 AM   #8
eric123
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Personally I would just leave it alone and ride it as is. I would look for another bike to mod and keep this one a runner...

Many times I have bought a bike and thought to myself, "I will just change this one small part and be up and running in a day." Three years later the bike is still in parts scattered around the shop...Never tear apart a running, fully functional bike when it is your only runner...You will quickly look back and think, "Too bad I didn't get to ride this year either, maybe next year"

eric123 screwed with this post 01-23-2010 at 05:08 PM
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Old 01-20-2010, 11:32 AM   #9
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Quote:
Originally Posted by eric123
Personally I would just leave it alone and ride it as is. I would look for another bike to mod and keep this one a runner...

Many times I have bought a bike and thought to myself, "I will just change this one small part and be up and running in a day." Three years later the bike is still in parts scattered around the shop...Never tear apart a running, fully functional bike when it is your only runner...You will quickly look bike and think, "Too bad I didn't get to ride this year either."
Wise words that apply to all kinds of "I can make this just a little bit better" projects.
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Old 01-23-2010, 06:14 AM   #10
oc_nightmare OP
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Here are two little updates on the SR
- New Shorty Reverse cone muffler, sounds awesome now, have to rejet it now though


Had to replace the front sprocket, the teeth were all bent... rear one and chain are fine.




Thanks for the comments guys
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Old 01-23-2010, 11:19 AM   #11
eric123
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That is a great looking bike. I would love to own one. Looks like the previous owned reversed the front sprocket at one point?
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Old 01-23-2010, 12:07 PM   #12
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Gotta pitch in with the "leave it alone and ride it" croud. That's a cool looking little bike just as is.

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Old 01-23-2010, 12:21 PM   #13
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Nice! I agree, ride it as is until you need to do work on it.

But if you decide to get ambitious (sp?) check this out.

http://www.thumpertalk.com/forum/sho...d.php?t=596217
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Old 01-23-2010, 12:58 PM   #14
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Quote:
Originally Posted by brucifer
Nice! I agree, ride it as is until you need to do work on it.

But if you decide to get ambitious (sp?) check this out.

http://www.thumpertalk.com/forum/sho...d.php?t=596217
There is another thread on TT about a YZ465/TT250 Franken bike.

In Short, heres the breakdown.
Yamaha YFM350 84mm piston and sleeve, the engine case has to be enlarge to fit the larger cylinder into it.
The wrist pin has to be reamed out to 20mm, from 19mm.
He also used a WebCam (regrind stock cams) for more mid and top end.
Copper head gasket, .21" thick.
Makes a 310cc Engine.

I'm going with the same type specs, except its going to be an XT250, I'm going to put it in a YZ490 chassis.
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Old 01-24-2010, 09:18 AM   #15
oc_nightmare OP
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zecatfish and brucifer, i read the thread on YZ465/TT250 frankenbike and it was quite an awesome build

did he use the stock XT250 head? Aren't the valves too small for the larger piston?

for 2 more milimeters he could use the XT350 piston and sleeve, why didn't he?

Cheers
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