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Old 04-25-2010, 03:12 AM   #46
milkman
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Joined: Jun 2007
Location: Steak and Kidney Inmate
Oddometer: 137
Great job mate - i had one of those, with some ace bars, a reverse cone mega, and a filter, and had a ball, toured over 3000km in that trim.

wish I'd tried it with lighter wheels and a porting job!
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Old 04-26-2010, 03:48 AM   #47
oc_nightmare OP
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Location: Leiria, Portugal
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thanks mate,
the head is already at the machine shop to enlarge the seats for the YFM350 valves

copper gasket, bore 84mm, thickness 0.021"


perfect match
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Old 05-17-2010, 04:52 PM   #48
JakeSnow
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Location: Melbourne, Australia
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Talking

Hi oc nightmare, I have just found this build thread and love what you have done! Do you still have the bike? How is it running? Any updates?

I have a SR250 from the 80's but they are pretty similar in design I believe.

I have a bunch of questions if you wouldn't mind answering them?

1) What is the upgrade you made to the clutch? It looks awesome, does it give any performance enhancement? Better adjust-ability or tension?

2) How did you drop the forks/lower the suspension?

3) You got new alloy wheels? Was there much difference in performance? How much did they set you back?

4) How much did you pay for the exhaust and where did you get it from?

5) Did you gear it up? Looks like you used a 17T front sprocket? Did this slow your acceleration much?

Thanks for your time, I am wanting to do these modifications to my SR so any response/answers would be greatly appreciated.

Cheers!
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Old 05-23-2010, 03:03 PM   #49
oc_nightmare OP
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Quote:
Originally Posted by JakeSnow
Hi oc nightmare, I have just found this build thread and love what you have done! Do you still have the bike? How is it running? Any updates?

I have a SR250 from the 80's but they are pretty similar in design I believe.

I have a bunch of questions if you wouldn't mind answering them?

1) What is the upgrade you made to the clutch? It looks awesome, does it give any performance enhancement? Better adjust-ability or tension?

2) How did you drop the forks/lower the suspension?

3) You got new alloy wheels? Was there much difference in performance? How much did they set you back?

4) How much did you pay for the exhaust and where did you get it from?

5) Did you gear it up? Looks like you used a 17T front sprocket? Did this slow your acceleration much?

Thanks for your time, I am wanting to do these modifications to my SR so any response/answers would be greatly appreciated.

Cheers!
Hi there, Jake
1 - The upgrade is just a complete hydraulic clutch i had here and as my girlfriend dropped the bike on the standard clutch and broke the lever, i ended up using this one. It has much more feel than the cable
2 - I didn't lower the forks, they are just a little undercharged, but im planning on adressing that after im finished with the engine.
3 - You might not believe it, but i felt a ton of difference in the handling and acceleration, perhaps because i dropped from 19" to 18" on the front and as i had a huge tire on the back, the bike now feels much lighter. The alloy rimms look much nicer too... the both cost me around 60 euro on a local shop.
4 - The exhaust came from ebay.uk, it is a shorty megaphone and i dont remember how much i paid for it... maybe 40-50 euro.
5 - Im running now 17/40 because im waiting to get the engine ready, but the acceleration dropped a bit. Much more relaxed ridding though, at 100kph in top gear, the engine is going nice and smooth :)
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Old 05-23-2010, 03:12 PM   #50
oc_nightmare OP
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anyway, for the real updates
the finished head with the larger YFM350 valves:



bunch of stuff from yamaha (€€€€€€)


painted cylinder



the start of the disassembly



engine out






thats what a SR250 engine looks like after 70000km
the engine is going tomorow to the machine shop to be machined to fit the new sleeve ;)

and btw, here goes a video i made with the stock SR but with 17/40 transmission and megaphone exhaust
http://www.youtube.com/watch?v=XsYK_DTs4zw
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Old 06-07-2010, 02:52 PM   #51
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Updates:
after some unsucessful attempts to take the rocker pins from the stock head to mount on the new head, i had to make a special tool to take them out


after a while...


piston and cylinder in... thumper!!!!



on the head department:


new seals


mounted valves and springs



rockers


camshaft with new bearings


polished cover


ported intake manifold


new steel head pins (the older ones were in bad shape)


had to port the holes a little to get the pins in


it fits with the new oil pins


and finally the engine is pretty much assembled, only the covers missing to be polished


i hope to get the bike running tomorow
i hope aswell that this whole thing doesnt explode
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Old 06-07-2010, 06:15 PM   #52
brucifer
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Don't jinx yourself! lol. It'll be fine. Again, nice work.
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Old 06-08-2010, 01:34 PM   #53
oc_nightmare OP
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today i polished the rocker covers


engine ready to be mounted in the frame


after sweat, tears and grease...


It's aliiiiiiiiiiiiveeeeeeeeee
http://www.youtube.com/watch?v=226pqBrawk8

and there you go, its all ready


still have to fine tune it a lot though but at least it didnt explode
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Old 06-08-2010, 01:39 PM   #54
notarex
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Old 06-09-2010, 07:29 AM   #55
eric123
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Very cool...
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Old 06-10-2010, 02:44 AM   #56
nanno
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Well done... just ahead of a similiar overhaul on my XT500. Looking really nice what you did.

Just a question, how did the engine-shop manage to enlarge the bore on the crank-case with the crank still installed, or did you completely disassemble the engine ?

Cheers,
Greg
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Old 06-10-2010, 02:48 AM   #57
oc_nightmare OP
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nanno, they said that it wasn't needed to disassemble the whole engine and they would protect the lower part of the engine when they did the work... how they did it, i have no idea :)
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Old 06-10-2010, 06:44 AM   #58
nanno
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Interesting... hope you enjoy your SR312 ;-)
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Old 06-10-2010, 04:54 PM   #59
oc_nightmare OP
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far from it, im having a lot of trouble finding the right jetting for it i was trying to get a VM34 or 36 from Sudco prejeted but they only returned one of the emails and they take ages to answer back
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Old 06-11-2010, 01:58 AM   #60
nanno
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Try a small(-ish) dellorto

VHSB30 and PHBE32/34/36 is mounted to a lot of Guzzis... and they're dead easy to jet.

The Suzuki DR350 has a 34mm CV-carb which could also work rather nicely with your setup, as you're still running an airbox... And this one should work out of the box IMHO (fine-tuning required, but you should get it running)

Cheers,
Greg
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