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Old 01-24-2010, 03:12 PM   #16
Zecatfish
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Quote:
Originally Posted by oc_nightmare
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
The Big Bear quad is a two valve engine. I think thats the reason for that, plus it has the same piston height from the wrist pin to crown.
He used the stock head.

Theres another fellow working on if an XT500 87mm will work.
Not sure there is enough material to bore out the cylinder that large. Might break through to the cooling fins. Then there is the issue. Would there be enough material at the cylinder studs to retain reliability, it would make 340cc.

There is one other fellow on TT that has and XT250 bored/stroked to 430cc.
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Old 01-24-2010, 03:22 PM   #17
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Quote:
Originally Posted by Zecatfish
The Big Bear quad is a two valve engine. I think thats the reason for that, plus it has the same piston height from the wrist pin to crown.
He used the stock head.

Theres another fellow working on if an XT500 87mm will work.
Not sure there is enough material to bore out the cylinder that large. Might break through to the cooling fins. Then there is the issue. Would there be enough material at the cylinder studs to retain reliability, it would make 340cc.

There is one other fellow on TT that has and XT250 bored/stroked to 430cc.
jesus

could you get me more links and info? it would be nice to get that kind of info on this topic, in case of someone has the same engines as this ones

one of my fears is that the XT and SR250 have such oversquare engines, if one is going to increase the bore so much, i have no idea what can happen... mainly because of the piston weight and speed.

any idea on HP and torque gain for the 310, 340 and 430cc preparations?
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Old 01-24-2010, 03:31 PM   #18
bill pierce
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Quote:
Originally Posted by oc_nightmare

I would replace the chain as well. A stretched chain is what causes wear like that. In fact, if you change the chain before it stretches too far sprockets last much longer.

The reason the rear doesn't look so bad yet is because the chain has more wrap around the sprocket.
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Old 01-24-2010, 05:21 PM   #19
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i dunno bill, the chain looks quite alright of wear and i tensioned it when in swapped the sprocket... i will take a closer look at it though
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Old 01-24-2010, 05:24 PM   #20
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I know very little on the 430 stroker.
http://www.thumpertalk.com/forum/sho...7&postcount=34
And the Powroll he mentioned.
http://www.powroll.com/
I can't help more than that.
Your on your own from there.

you could build a little sleeper that would surprise a few folks.

Quote:
Originally Posted by oc_nightmare
jesus

could you get me more links and info? it would be nice to get that kind of info on this topic, in case of someone has the same engines as this ones

one of my fears is that the XT and SR250 have such oversquare engines, if one is going to increase the bore so much, i have no idea what can happen... mainly because of the piston weight and speed.

any idea on HP and torque gain for the 310, 340 and 430cc preparations?
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Old 01-24-2010, 08:16 PM   #21
bill pierce
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Quote:
Originally Posted by oc_nightmare
i dunno bill, the chain looks quite alright of wear and i tensioned it when in swapped the sprocket... i will take a closer look at it though
From this site http://www.ustsubaki.com/index.html
This may be helpful. It has helped me a bunch over the years http://chain-guide.com/index.html

The only way to really know is to measure between pin centers and compare with the chart for what it was new. Anything over 2% will cause rapid ware of the sprockets.

Good luck with your project. I love your bike.
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bill pierce screwed with this post 01-24-2010 at 08:22 PM
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Old 01-25-2010, 03:33 PM   #22
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OC I got an email from powell today, they can not help with the stock crank stroker. But on a side note I was told (hadn't verified yet) that the Big Bear YFM300 cylinder has the same stud spacing as the SR/XT250 so cylinder will work. BUT you might have to bore out the cases to fit the 350 cylinder....

One more side note I'm trying to find out if a YFM350 crank will fit a 250 case. IF it does, then it just a matter of money and the 430 stroker will work.

You might be able to get http://www.faliconcranks.com/ to custom stroke your crank and a custom rod (shorter) with the 84mm piston.....
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Old 01-25-2010, 04:31 PM   #23
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Quote:
Originally Posted by Zecatfish
OC I got an email from powell today, they can not help with the stock crank stroker. But on a side note I was told (hadn't verified yet) that the Big Bear YFM300 cylinder has the same stud spacing as the SR/XT250 so cylinder will work. BUT you might have to bore out the cases to fit the 350 cylinder....

One more side note I'm trying to find out if a YFM350 crank will fit a 250 case. IF it does, then it just a matter of money and the 430 stroker will work.

You might be able to get http://www.faliconcranks.com/ to custom stroke your crank and a custom rod (shorter) with the 84mm piston.....
I haven't found anything on the Big Bear YFM300 cylinder, but if you meant Big Bear YFM350 and if it has the same stud spacing as the SR250, the YFM350 can fit aswell and it sure has bigger valves, i guess and that would make a ton of difference.

This is very good info, thanks a lot mate
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Old 01-25-2010, 05:15 PM   #24
Zecatfish
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Quote:
Originally Posted by oc_nightmare
I haven't found anything on the Big Bear YFM300 cylinder, but if you meant Big Bear YFM350 and if it has the same stud spacing as the SR250, the YFM350 can fit aswell and it sure has bigger valves, i guess and that would make a ton of difference.

This is very good info, thanks a lot mate
Oops typo, yes it was the YFM350.
Yamaha made a YFM400 too. I wish it wasn't so hard to find engine blueprint specs, as in rod length, cylinder height, etc.

Good Luck with it.
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Old 01-26-2010, 10:07 AM   #25
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today i was lowering the front forks and suddenly one of the towers started to leak oil, a lot of it the only thing i did was rotating the inside part to get it to move because it was stuck in the stock position... it is leaking under the tower, i haven't seen any forks leaking from other places besides the oil seals.

any ideas on what is happening? the other tower is fine

sorry for the bad english folks.
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Old 01-27-2010, 05:53 PM   #26
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i took her today for a little ride all the way to the coast, following the Lis river until the sea... the pics speak for themselves























cheers
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Old 01-27-2010, 09:11 PM   #27
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Usually the first performance gains are intake and exhaust, cute bike but whats with no one on those beautiful beaches?
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Old 01-28-2010, 06:41 AM   #28
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Great pics!
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Old 01-28-2010, 12:56 PM   #29
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Usually the first performance gains are intake and exhaust, cute bike but whats with no one on those beautiful beaches?
80kph wind and 3ºCelsius temperature
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Old 02-05-2010, 05:55 AM   #30
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i was wondering... what about another engine?

what is the weight of the XT350 engine? and what about the mountings? i think that the SR250 mounts are the same as the XT250, so, they should be pretty much the same as the 350 ones. the only thing that im not sure is the height difference between the two engines.

the XT600E engine would be wicked too, but the stroke is a little bit longer than the SR250, which makes the cylinder much higher... that would be pretty good as here, one can source a XT600E engine in very good condition for about the same price of a XT350 motor and it has the plus side of having the E word in the end. in a little bike as this one, the torque of the 600 could make this an awesome comuter with low fuel consumption

anyway, i instaled a lower bar... i was thinking about clipons but that would kill me on longer journeys... tell me what ya think:



there is some stuff to take care of, like the tacho and shorter cables, but i think the driving position is much better now :)
cheers
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