Honda GB500 Thumper Performance Upgrades?

[sammcj]

So that pipe wasn't free flowing enough aparently...

[Ojai]

You guys see this? http://www.trademe.co.nz/Browse/List...x?id=213897853

Any good?

[Pinstripe]

This thread is giving me ideas

Forgive my ignorance here, but is upping to a 600 simply a matter of fitting a rebored or XR600 cylinder and a wiseco XR piston, or is there a bit more to it?

[sammcj]

This thread is giving me ideas

Forgive my ignorance here, but is upping to a 600 simply a matter of fitting a rebored or XR600 cylinder and a wiseco XR piston, or is there a bit more to it?

You have to sleave the engine too.
Also, you have to rejet the carb and bore out or replace the exhaust.
It's also better go for the slightly older XR600 piston which results in something like 603 or 607cc rather than 575 or whatever it would be.

[Pinstripe]

You have to sleave the engine too.
Also, you have to rejet the carb and bore out or replace the exhaust.
It's also better go for the slightly older XR600 piston which results in something like 603 or 607cc rather than 575 or whatever it would be.

Cheers, looks like i have me a winter project

[sammcj]

Cheers, looks like i have me a winter project

Do it mate!
Need to see some more hotted-up GB's around!

[sammcj]

Great News!

KG made up a new 100% free flowing muffler today, sprayed it matt black and OH MY GOD does it sound good and whats more I feel like I'm being thrown off my seat when I open her up!

Movies and Pictures to come soon!

[Ojai]

great news!

Kg made up a new 100% free flowing muffler today, sprayed it matt black and oh my god does it sound good and whats more i feel like i'm being thrown off my seat when i open her up!

Movies and pictures to come soon!

Need! Need! Need!

[sammcj]

Very cool GB / XBR Project -

[sammcj]

So... to sum things up since I got the bike a year ago:

-New Seat
-Hand Made Free-Flowing Exhaust
-Replaced Altinator
-Replaced CDI
-Replaced Voltage Regulator
-Replaced Coil
-Replaced Clutch and Break Cables
-Replaced and Reconditioned Carb
-Larger Main and Jet in Carb
-New Plug (still factory, anyone go any idea what I should change this to?)
-New Piston
-New Battery
-New Dunlop Tires
-New Leavers
-New Mirrors
-Valve Grind
-Block Bored and Sleaved
-Ignition Wiring Fixed
-Resprayed Headers
-Replaced Break Pads


Comming up...

-Koni Shocks
-Chrome Bar-End Mirrors
-Tank / Covers Resprayed (Might Go Matt black)
-Xeon Front Headlight
-New Stainless 2-1 Headers

[sammcj]

Two Quick Videos (sorry about youtube's quality)

http://www.youtube.com/watch?v=w6m7kdbr-xA

http://www.youtube.com/watch?v=Fa5oSTM03Ts

[sammcj]

Better photos & video

http://www.youtube.com/watch?v=qPEiJ1Lnv1M

[sammcj]

Need some clip-on mirrors...

[Pinstripe]

Lookin' good man

maybe you should add a Davida lid and Halcyon mk.8/9s to your list too

[warp]

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 .