JDR bike build

[Ivan]

i know i was beaten to the frame build but not a gp spec frame Im loving it buildings so much fun
well kind of I started before Crazy-man but hes bound to finish along time before me,

I dont see what is so hard about building a motor like that? Im going to be running high compression the head will be pretty much sitting on the barrel theres a 14 thickness piece of copper seperating them from each other and to seal it all up port and polished head custom exhaust header pipe will match ports and be free flow basically to a muffler, Im going to be running a big carb and probably get the cam ground to road race spec in the end its not going to be the fastest but it should be quick enough and given the fact of what the chassis "should" handle like it will make up for the loss in power by being better in the corners

[koba]

How many dudes you know got the skill to build an engine like that?

There is a wealth of knowledge about such things held by grizzly old classic racers. I know a few who can work wonders but they are more interested in other things.

[speedpro]

The "CB100" bike referred to has an XL125S engine it by the looks. It may also be a CB125N but I've never seen one of them in NZ. An XR200 head fits straight on with it's big cam and valves and they come with a pretty good 6-speed gearbox.

Hardly a CB100, eh.

[Ivan]

it wont be to that level but i done the 200 head and cam

[gav]

The "CB100" bike referred to has an XL125S engine it by the looks. It may also be a CB125N but I've never seen one of them in NZ. An XR200 head fits straight on with it's big cam and valves and they come with a pretty good 6-speed gearbox.

Hardly a CB100, eh.

Oh sorry, he calls it a CB125, all the same arent they?
He's got a video of the motor running to 12500 rpm as well.

http://youtu.be/PsEFKYULNDc

[husaberg]

it wont be to that level but i done the 200 head and cam

Here is some Interesting but useless info
200s cams vs 200r cams are surprising different as well. The head is the same minus the decomp, but 200r or the 125s cams are hugely asymmetric lobes which is odd. Can't remember which one it is.

[Ivan]

first tank out the mould needs a tidy up and strenghten a few places

[F5 Dave]

Hate to burst your bubble but there is a CB100 based single down here that will smoke your FXR150. The guys that came down for BoB will no doubt have seen Wallaces wonderful 150cc single in his own home brewed chassis. The bike is seriously fast. With a faster rider on it, the bike would certainly be in the top 5 down here. Pretty sure he's got it to over 20hp now, too.

http://www.marshland.co.nz/CB150Frame.html

yeah & I've passed him on my 50. my 100 with at tops 18hp breezed past him a few times in a straight line at the BOB & the GP.

[F5 Dave]

dont quoteme on this as dads doing it but im pretty sure its epoxy its what they use for yachts HT9000

Good, then it has a good chance of being fuel resistant.

That being said the new unleaded fuels have some nasty aromatics so I'm not sure if that is still the case.

Poly is dodgy unless real thick & even then. . .

[jasonu]

Hate to burst your bubble but there is a CB100 based single down here that will smoke your FXR150. The guys that came down for BoB will no doubt have seen Wallaces wonderful 150cc single in his own home brewed chassis. The bike is seriously fast. With a faster rider on it, the bike would certainly be in the top 5 down here. Pretty sure he's got it to over 20hp now, too.

http://www.marshland.co.nz/CB150Frame.html

I find all of the above VERY hard to believe.
I am not rubbishing the bike or the owner but I believe Gav's above claims are at best overstated.

[speedpro]

I think Pete Sale ran a similar motor that he managed to get 20+hp out of. Mind you the cam chain broke 50m from the finish of an Ohakea GP. 3rd place was looking good until then. He coasted over for 4th behind me.

[Ivan]

Good, then it has a good chance of being fuel resistant.

That being said the new unleaded fuels have some nasty aromatics so I'm not sure if that is still the case.

Poly is dodgy unless real thick & even then. . .

this is only a dummy shell just so the bike looks tidy it wont actually be the fuel tank itself there will be a alloy or similar mini tank under the shell but otherwise the bike would look hideous with its massive gap there would be

[Moooools]

Good, then it has a good chance of being fuel resistant.

That being said the new unleaded fuels have some nasty aromatics so I'm not sure if that is still the case.

Poly is dodgy unless real thick & even then. . .

The best stuff to use is apparently Vinyl Ester resin. Very chemically resistant. Managed to score some from a boat builder out in review for not much at all. Never ended up using it though.

[F5 Dave]

I think Pete Sale ran a similar motor that he managed to get 20+hp out of. Mind you the cam chain broke 50m from the finish of an Ohakea GP. 3rd place was looking good until then. He coasted over for 4th behind me.

Yeah Petes bike was fast. I'm not knocking Wallace, hes a nice guy, but there is only so much you can do & I've raced with him a few times, a couple in the last few months (though on my 100). My 50 has the advantage of being light (pity I'm not) & I can pedal it onto the straights ok, but lets be real, I'm not making 20hp & a long track shows up HP.

[gav]

Yeah well, why believe a dyno printout either .....