Honda GB500 Thumper Performance Upgrades?

[sammcj]

Just thought I would add my bit as Ive picked up another GB after .....how long ago was 1987?.
should be back on the road in a month. think Ive gone a bit loopy with the engine . spent so much on the suspension thought it needed a bit extra. XL Hot Rod and 11:1 piston . XL 600 Barrell
Most money has gone to CSL for the sprint grind , porting , big valves and light springs. and "choke" titanium collets.
Havnt had a smal bike in years , I had forgotten how much fun they are .

Sounds like a beauty!
If it's in CHCH I'll have to see it!

[sammcj]

New mirror on...

[drmikenz]

New mirror on...

mint
just got myself a GB400 the other day and was wondering where you got the mirrors and the knee grips from ?

M

[sammcj]

mint
just got myself a GB400 the other day and was wondering where you got the mirrors and the knee grips from ?

M

Good on ya!
Mirrors were from Trademe, but I'm sure you could get them in a bike shop locally.

The grips were on ther tank when I bought it so can't help you there sorry!

[drmikenz]

no worries, i think motomail has bar end mirrors.. will keep searching for those knee grips!

off to have some konis put on in the next few weeks too once i've scraped together some cash

what did you end up doing with that dunstall replica ? is it the same loudness as the standard pipes or significantly louder ? my exhaust is pretty dinged up so will replace it some stage soon but don't really want to go much louder than standard..

[sammcj]

no worries, i think motomail has bar end mirrors.. will keep searching for those knee grips!

off to have some konis put on in the next few weeks too once i've scraped together some cash

what did you end up doing with that dunstall replica ? is it the same loudness as the standard pipes or significantly louder ? my exhaust is pretty dinged up so will replace it some stage soon but don't really want to go much louder than standard..

I had to re-sell it, it was far, far too restrictive, got a custom made straight through pipe made up

[drmikenz]

I had to re-sell it, it was far, far too restrictive, got a custom made straight through pipe made up

bugger, i would have bought it off you. what was the sound like compared to the stock ? i've heard the sound of your straight through on youtube, very nice but a bit loud for me

[sammcj]

I didn't even put the pipe on in the end, you can pick them up on trademe for about $80+shipping.

I wouldn't recomend it, they're really designed for at least a 2 cyl bike.
Mine is a 200cc bigger than the GB400 of course mind you.

[vinducati]

Deus ex machina have opened a shop in Auckland near Victoria Park Market , on Wellesly Street.
Check it out, very nice custom SR400, WS650, Bonnies,
also good Cafe and Clothes.
It's in the old Powerboard warehouse which is mainly a carpark area.
They also have a website based in Australia.
They have just opened and makes other bike shops look a bit sloppy.

[Gerard]

Hello.
Please, what brand and model piston is ?
And sleeve ?
Stock sleeve re-boring?
XL or XLR 600 sleeve?
If XL or XLR sleeve, motor cases hole re-boring?
And what is your cylinder head gasket now?
Thank's for infos.
Bye,
Gerard.
France.

I've decided to over-bore the engine to 600, changing piston to a 100x75 I think it was, should be done in two weeks time, I'll post photos etc... Can't wait!

[The Pastor]

Hello.
Please, what brand and model piston is ?
And sleeve ?
Stock sleeve re-boring?
XL or XLR 600 sleeve?
If XL or XLR sleeve, motor cases hole re-boring?
And what is your cylinder head gasket now?
Thank's for infos.
Bye,
Gerard.
France.

I'd talk to your local motorbike mechanic mate.

[sammcj]

Hello.
Please, what brand and model piston is ?
And sleeve ?
Stock sleeve re-boring?
XL or XLR 600 sleeve?
If XL or XLR sleeve, motor cases hole re-boring?
And what is your cylinder head gasket now?
Thank's for infos.
Bye,
Gerard.
France.

Hey,

Can't really remember sorry.
It wasn't a stock sleeve thats for sure.