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Old 01-26-2012, 09:57 PM   #151
taco jeff
DR650
 
Joined: May 2007
Location: Western Washington, USA
Oddometer: 17
Nice!

I'm thinking of doing the 312 set up to my 1981 TT 250. Did the bigger valves work with the original valve seats? But, there is no replacement for displacement!
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Old 01-27-2012, 10:45 AM   #152
oc_nightmare OP
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Joined: May 2009
Location: Leiria, Portugal
Oddometer: 188
yes mate, just machine the stock seats and you're on :)

two things i should have tried aswell were a nice camshaft regrind and another carb but maybe next time :)
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Old 01-28-2012, 10:44 AM   #153
taco jeff
DR650
 
Joined: May 2007
Location: Western Washington, USA
Oddometer: 17
Thanks for the info about the valves and also the great build thread. I race my TT in the vintage motocross series and want to hot rod it.I also know of a XT 600 for sale cheap and like the looks of your"big block" SR! I do like the light weight of my TT so I just might keep it small. Did you use a stock base gasket when you did the top end on the 312? I have a great local cam company and I think more lift in the middle would be nice. More duration might let the valves kiss the piston with a thin head gasket...
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Old 01-29-2012, 10:39 AM   #154
oc_nightmare OP
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yes, with a thin gasket and bigger valves you might have that problem but if so, you just have to machine the piston a little for extra gap between the valves and the piston. more duration would be great because it is still a 2 valve head and more flow would have a nice effect on the peak horse power i think :)

yes, the stock base gasket and o-ring are fine with the bigger sleeve, no problem there just beware of the copper head gasket thats too thin, mine leaked a little...
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Old 07-31-2012, 06:55 PM   #155
oc_nightmare OP
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Location: Leiria, Portugal
Oddometer: 188
Yes it wasn't finished yet





TRX850 front suspension with 295mm rotor



Made a new oil tank



Corrected the chain offset



that's all for now
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Old 08-04-2012, 06:39 PM   #156
oc_nightmare OP
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Old 08-05-2012, 01:51 PM   #157
nanno
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Location: Linz, Austria
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Nice welding!
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Old 08-10-2012, 03:22 PM   #158
oc_nightmare OP
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Location: Leiria, Portugal
Oddometer: 188
Thanks nanno :)
A couple of updated photos


preview
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Old 09-24-2012, 04:35 PM   #159
regal7point5
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Joined: Sep 2012
Oddometer: 2
Project is looking good!!!

I sent a message on one of your youtube videos, but not sure how often you check in on them and figured this was a better place to post. Also might help some others contemplating this. My question is about the 312. Did you use a stock SR250 cylinder and resleeve it, or did you use a YFM350 cylinder? Can you put a YFM350 sleeve in a SR250 cylinder?? I am somewhat confused
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Old 09-25-2012, 02:00 AM   #160
oc_nightmare OP
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Location: Leiria, Portugal
Oddometer: 188
Quote:
Originally Posted by regal7point5 View Post
Project is looking good!!!

I sent a message on one of your youtube videos, but not sure how often you check in on them and figured this was a better place to post. Also might help some others contemplating this. My question is about the 312. Did you use a stock SR250 cylinder and resleeve it, or did you use a YFM350 cylinder? Can you put a YFM350 sleeve in a SR250 cylinder?? I am somewhat confused
Hi there mate, I already replied to your message on the youtube video but to answer your question, I used the SR250 cylinder bored to fit a custom sleeve. Beware though, the sleeve is only going to end with a 1,5mm wall and the cylinder wall will be paper thick, your machinist has to be really good not to cut through the alluminium.I don't see the need to use an YFM sleeve because it has to be machined on height and thickness, so a custom sleeve is cheaper, I reckon. The Cases were bored aswell

Here go some updated photos
the custom seat i made

cleaning the shed afterwards

the SR resting in the shed

my girlfriend testriding the SR


I guess that's all for now, I've ordered a new 39T rear sprocket because this one with 45T is waaaaayyyy too short. Going to paint the gas tank soon but don't know yet what colour will it be though
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Old 11-23-2012, 04:15 AM   #161
oc_nightmare OP
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Location: Leiria, Portugal
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There ya go, all finished (for now). The fuel tank just had a small coating of metal varnish because I love the color of the steel and it was the cheapest option




My girlfriend aproved it as always
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Old 02-17-2013, 02:51 PM   #162
regal7point5
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The bike is looking good! I missed out on a deal of a XT600 just last week...darn!

One more question on the SR312...did you use the YFM350 valvesprings too, or just reuse the stock SR250 springs? Not sure if one is better/stronger/different than the other.

I am slowly gathering parts and should be getting some real work done on mine soon!
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Old 02-17-2013, 05:40 PM   #163
oc_nightmare OP
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Quote:
Originally Posted by regal7point5 View Post
The bike is looking good! I missed out on a deal of a XT600 just last week...darn!

One more question on the SR312...did you use the YFM350 valvesprings too, or just reuse the stock SR250 springs? Not sure if one is better/stronger/different than the other.

I am slowly gathering parts and should be getting some real work done on mine soon!
I thought about the valve springs when I did the engine and assumed that because the warrior's not a revy engine, the valvesprings would be about the same compared to the stock SR ones.
I'm doing a welding certification (P24 steel this time) and haven't been home in a long time and now I really miss my big thumper

When I start earning some money, I'm going to redo the whole frame again (make space for an airbox and make a craddle) like I really mean it, stay tuned
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Old 07-29-2013, 06:10 PM   #164
Bvander
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Location: Gold Coast Australia
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Nice work on the bike mate. It has been a bit of a guide for me to start planning some mods to mine. Thought I would sign up and say thanks for the info.

I am planning to stick a 83mm piston in which will give a 305cc displacement. I was wondering if you had to bore out your case to fit the 84mm piston in?
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Old 07-29-2013, 06:29 PM   #165
Valleyrider
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Joined: Apr 2007
Location: Idaho Panhandler
Oddometer: 1,851
Very nicely done!!
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