BANZAI's TO DO list for GN250!!

[BANZAI]

Mmm studying is not going that well.....

Just looked back the beggining of the thread.

TO DO:
Tyres (Done)
GASKETS (Not yet)
Oil&filter (Not yet)
Brake fluid (Not yet but maybe ok for now)
Plug (Don't need to yet)
Air filter (Not yet)


Wish list:
Straight Handle bar (Done but want GB250 straight bars)
Adjustable clutch lever (not yet, perhaps it's ok)
Brighter but smaller tail-light (Not yet, still looking for one)
HID head light (Changed to Halogen, but want 45/45w Halogen)
Double side Exhaust (Single "Capton Muffler" would look cooler?)

Does it suppose to be called Capton Muffler? This website says so and thats how we say in Japan..
http://www.cmsnl.com/products/capton...er_5431087850/

Bikini Cowl (Not really a Bikini but half cowling. DONE!)

Something to add:
Chains.
Front sprocket same teeth.

Couple suggestions from FilthyLuka:
Rear sprocket maybe one tooth smaller (less revs in 100kmh cruise)

Clean up the ports with a dremel and a carbide bit

He also suggested dump airbox and change to pod filter and Jet the carb but I think I will leave it as it is

Slow but nice progresses

Thanks heeeaps for all people who involved in this

[motorbyclist]

Rear sprocket maybe one tooth smaller (less revs in 100kmh cruise)

gearing it up also means less torque when trying to accelerate to that 100kph cruise

(will feel less grunty)

[BANZAI]

gearing it up also means less torque when trying to accelerate to that 100kph cruise

(will feel less grunty)

That's why we need MORE POWWERRRRRR!!!

How much would porting give me? I don't need custom porting but want to smooth out the port. Do you have any tool for that?


How can I get more Torque out from this engine?
I think this engine's charactor is total opposite of 2strokes.

Have enough torque to pull the bike up to 100kmph smoothly without peakiness. (but not as much torque as multi cyls ofcource)

Its sort of like old British engines (Don't know about british bike engines but old british lightweight sports cars does not have screaming high revving engine like what Italian had)

I'm not expecting high performance from GN250 but want to make it more fun bike to ride

[motorbyclist]

high compression piston kit!

big bore kit!

(note if you make the engine markedly more grunty the clutch then gearbox start to go)

[EJK]

GN400 Carb!

[Squiggles]

How much would porting give me? I don't need custom porting but want to smooth out the port. Do you have any tool for that?


How can I get more Torque out from this engine?
I think this engine's charactor is total opposite of 2strokes.

Do a search, many have asked, answers have been given... theres not much to be gained without a lot more money than the bike is worth, and most gains are offset by other losses.

[BANZAI]

high compression piston kit!

big bore kit!

(note if you make the engine markedly more grunty the clutch then gearbox start to go)

That's bit toooooooo extreme!

Won't porting and exhaust change would give me some extra couple hp?

In GT4 they do XD

How hard is it to pull +3hp from motorbike engines? (25hp would match with CB250RS spec )

I want to keep it light tuned.

GN400 Carb!

Like what your FXR have RS carbs?

Hmmm tempting... Maybe DR350 carbs, it's newer. But then it's gonna meke it peaky as like your FXR

[EJK]

Whats wrong with my FXR? It's got MOAR PAWA and that's good! lol

Get an air filter like mine too hahaha

[xwhatsit]

BANZAI -- probably best to just leave the engine alone, to be honest. I want to rebuild my spare CB250RS bits into a 325cc monster, but don't have any illusions about it being cost effective or even that it will last 100,000kms without attention. Remember I won't be selling my bike either; doing things like that to an engine generally isn't good when you want to sell it.

I'd enjoy what you have, you're right, the GN250 is an old-style thumper, slow-revving torque. Stick an open megaphone on it and enjoy

[BANZAI]

BANZAI -- probably best to just leave the engine alone, to be honest.
I'd enjoy what you have, you're right, the GN250 is an old-style thumper, slow-revving torque. Stick an open megaphone on it and enjoy

Yep. I don't want to change too much, but want to fine tune what I can

1939 Triumph Tiger 100 had 500cc engine producing 34bhp, weigh around 190kg

Which is very similar P/W ratio to GN (T100 5.58823529 GN250 5.86363636 actually GN is slightly better)

T100 can do "100miles" (actually 150kmh lol). So GN should!!!

I want to rebuild my spare CB250RS bits into a 325cc monster, but don't have any illusions about it being cost effective or even that it will last 100,000kms without attention.

Hehe fully tuned DR350 engine

[BANZAI]

Single "Capton Muffler" would look cooler?

It's actually called CABTON muffler and the word came from Japan, it stands for

Come And Buy To Osaka Nakagawa

The motorcycle maker called CABTON existed back in 30s-60s? in Japan had this shape of muffler.

http://f10.aaa.livedoor.jp/~yotosama...in/yufuin.html
(second pic in row of pics in museum, the bike has CABTON logo on it)
http://www.imai-auto.jp/s_owner/detail.cgi?no=48

It was a copy of ARIEL muffler.
http://www.usq.edu.au/users/grantd/m...ges/500VH1.JPG

Strange thing is some of Triumphs have this shape of mufller too.

What are they called in english then!???

I wish I can do motorcycle history paper, I won't mind researching all the stuff for it and write 5000words essay eh... Stupid music history!!!!

[klyong82]

Some nice pics there banzai. I like the red one..... enjoy interesting to learn about motorcycle history from a Japanese.

[ehab2weelr]

that would actually look real nice on the gn....

[BANZAI]

Stilll no parts.....

[ehab2weelr]

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hahahah this is fun.....fuk im board......