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Old 06-16-2010, 07:12 PM   #61
JakeSnow
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Location: Melbourne, Australia
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Thanks!

Thanks for answering my questions!

Very cool to see some progress on this build. Love the way it is looking and Im sure once you get the jetting right it will be a mean individual.

Have you considered getting a dyno tune? I have heard it is well worth it If you have spent time and money on engine mods. I would finish/do all the mods you want to do before getting it done though - like maybe a pod filter and single walled exhaust header. Also I have heard that getting a bigger carb will make the horse power quite 'peaky'. And that if you can jet a smaller one correctly you have a nice even power curve with torque from dot.

Hey Im pretty sure I saw a video of your bike on youtube yesterday with the megaphone exhaust? Sounds amazing!
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Old 07-30-2010, 04:10 AM   #62
oc_nightmare OP
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Found out why i was having an hard time jetting the bike... i have an intake leak between the port and the spigot (i think thats the name)... now it idles very good but it gets very rough on 1/10th to 1/8th throttle, could it be the pilot jet too high?


I have another problem... The clutch already slipped a little with the stock engine (it has almost 70000km) and now it is ten times worse! Now i just dont know if it is enough just to replace the friction disks or if i have to put stronger clutch springs (i have no idea where to get them or which ones work). The clutch spins everytime i get near the WOT or when it gets from middle to high rpm
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Old 07-30-2010, 10:14 AM   #63
webmonstro
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nice

Hi OC
Nice bike yould have made it a single seater myself , but that looks good
As for the clutch you should be able to notice when you replace with new discs,
if it still slips, maybe then try to get stronger springs.
Too bad yamaha didn't make a stock 400 or so version of this !
what top speed do you got before the rebuild? (250cc)

Épa estiveste a pé de minha casa (Serra da Estrela) :)
um abraço
Nuno
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Old 07-30-2010, 03:56 PM   #64
eric123
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Quote:
Originally Posted by webmonstro
Hi OC
Nice bike yould have made it a single seater myself , but that looks good
As for the clutch you should be able to notice when you replace with new discs,
if it still slips, maybe then try to get stronger springs.
Too bad yamaha didn't make a stock 400 or so version of this !
what top speed do you got before the rebuild? (250cc)

Épa estiveste a pé de minha casa (Serra da Estrela) :)
um abraço
Nuno
Um...You mean the SR400? Awesome bikes...Too bad we can't get them in the states
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Old 07-30-2010, 07:19 PM   #65
oc_nightmare OP
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Yamaha did make this bike with 400 and 500cc single cylinder engines but they weren't avaliable here in Portugal

I really like my bike as it is now because it has a lot of grunt on low rpm and it can scream too... the engine is very elastic and it seems to me that the headwork really improved the higher rpm range. Im thinking about having my camshaft reground to make the middle and top range even better. It is such a light bike that the difference between the 239 and the 312 big bore is huge. It vibrates a lot now and it gives a more muscular feel to the bike. Besides, with the weight in mind, i guess that with the engine fully healthy i could keep up with the SR500 and besides, i have electric start

With the slipping clutch im getting 130km/h and it gets there pretty fast... more than that, the clutch starts to slip a lot. Before it struggled to get to 120 but now it is so much torquier, it is a joy to ride it on the city roads.


Belas estradas para esses lados ehehehe gostei muito de ir aí na SR

Diogo
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Old 10-17-2010, 05:28 AM   #66
oc_nightmare OP
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Dual sported









This bike is so much fun on the dirt suspension could be better though and engine could have more grunt, but still...
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Old 10-19-2010, 04:32 PM   #67
oc_nightmare OP
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How hard could it be to give my SR a XT600E engine? I guess we are soon going to find out
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Old 10-30-2010, 08:42 AM   #68
oc_nightmare OP
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two little clips on the scrambler SR312
http://www.youtube.com/watch?v=l3HfO6nj9MA
http://www.youtube.com/watch?v=UwcUcK0vhrg

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Old 10-30-2010, 01:42 PM   #69
nanno
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Quote:
Originally Posted by oc_nightmare
Obrigado!

(That's about as far as my Portuguese goes)

Cheers,
Greg
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Old 11-01-2010, 08:27 PM   #70
oc_nightmare OP
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Quote:
Originally Posted by nanno
Obrigado!

(That's about as far as my Portuguese goes)

Cheers,
Greg
"de nada" (you're welcome)
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Old 11-01-2010, 09:41 PM   #71
boingk
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Great project, love what you've done with the little SR250!

If your clutch is still slipping you should be able to easily fix it by getting new clutch plates and some performance clutch springs. If they dont do 'performance' ones then just let them know that you want stronger springs that will fit the SR250.

Cheers -- boingk
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Old 11-02-2010, 05:47 AM   #72
oc_nightmare OP
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thanks boingk, i already replaced the plates and springs for the new stock ones and theres no more slippage, it is perfect now, as far as the clutch goes

Could use a little bit more grunt though dont know how to get more power of this engine without spending big bucks
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Old 11-02-2010, 10:06 AM   #73
Sniper X
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Quote:
Originally Posted by oc_nightmare
thanks boingk, i already replaced the plates and springs for the new stock ones and theres no more slippage, it is perfect now, as far as the clutch goes

Could use a little bit more grunt though dont know how to get more power of this engine without spending big bucks
Drop a tooth on the counter or add a few to the rear. Only way for not much donero.
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Old 11-02-2010, 01:05 PM   #74
nanno
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I have a 37mm Keihin FCR, if you want to play around with it... THAT could indeed help with the performance!

Cheers,
Greg
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Old 11-02-2010, 01:26 PM   #75
boingk
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37mm carburettor would be overkill - especially if its a flatslide.

I would recommend probably 2 to 4mm over the stock item, up to maybe a 34mm CV Mikuni or 32mm smoothbore.

You could also look at cam timing and aftermarket ignitions for a bit more performance.

Cheers - boingk
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