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Renegade
18th July 2011, 12:58
i have just re-vinned the GB and using as a daily commute,

shes got new brakes, tyres, swing arm bushes and going fairly well however im after a manual such as a haynes manual etc.

Id like to rebuild the motor but i understand from reading previous threads and google searches that the motor is not the same as the GB500.

Can anyone offer info on the motor and how its similar to the xr400\xl400 motors or are they not the same?

which after market big bore kits etc are available for my motor etc.

ideally id like to rebuild it myself but am open to assistance from persons who have actually built a few of these motors up or have done engine swaps etc.

definitive concise help appreciated :corn:
White trash
18th July 2011, 13:21
Doesn't need a big-bore. GB400's go quite well stock. Photgraphic evidence attached.243082
HenryDorsetCase
18th July 2011, 13:28
search this site, I think Mr Spank This built one that was 630cc, then got some hot asian girlie to sit on it topless. awesome!
Sable
18th July 2011, 17:03
They're the same. Slightly shorter stroke and smaller bore is all.
Bender
18th July 2011, 19:00
There was a long thread on a forum called thumperpage that went into this. If I recall correctly, the 500 will take XR650 piston and top end, the 400 needs machining - the piston skirt and crankcases.

Unfortunately that site was taken down so all that stuff was lost.
Renegade
20th July 2011, 00:24
There was a long thread on a forum called thumperpage that went into this. If I recall correctly, the 500 will take XR650 piston and top end, the 400 needs machining - the piston skirt and crankcases.

Unfortunately that site was taken down so all that stuff was lost.

yeah i was referred to it only to find it gone...
gammaguy
20th July 2011, 02:14
the engine is the same as the XR 400 of similar year(japan model)

I have a manual for the 500 which is very similar if you are interested.

its on my website,I wont plug it here but is on my profile.

send me a message from the website and ill send you teh manual for freebie:yes:
Renegade
20th July 2011, 17:29
the engine is the same as the XR 400 of similar year(japan model)

I have a manual for the 500 which is very similar if you are interested.

its on my website,I wont plug it here but is on my profile.

send me a message from the website and ill send you teh manual for freebie:yes:

sent you a message through the contact us page.
Renegade
10th August 2011, 17:41
still after info regarding the engine, what parts suit/cross over from other models etc, after market engine kits etc

any help/tips appreciated.