JDR bike build

**Ivan** · 29th December 2011, 21:25

Originally Posted by Henk

Ivan, my two cents for what it's worth. Use the existing points, run total loss with a coil from a hi ace van if that's all you can find and get it running, you can go hunting more power, less weight etc later. With your frame being a scratch build you want the engine room to be as simple and reliable as possible to start with. If it handles as well as it should given the geometry you are basing it on you will be looking at an engine with more development potential before too long in any case.

yeah well I have 2 motors now so am building one as a straight points ignition setup motor to get the bike going but am also building the other motor into the faster engine

**Ivan** · 29th December 2011, 21:28

Half of the tank mould poured the other half today so tommorow morning we will seperate both sides fill in any small holes paint the mould and saturday will have a first tank made

**Henk** · 29th December 2011, 21:31

Originally Posted by Ivan

yeah well I have 2 motors now so am building one as a straight points ignition setup motor to get the bike going but am also building the other motor into the faster engine

I hate to break it to you but an old Honda CB single based motor is never going to be competitive at the sharp end of the field. A CB twin maybe but the only ones running at the front down here have been built and tuned by JC and are the max capacity the rules allow and have had twenty odd years of development, the only Honda singles in the A grade here are GL based, have had serious work and are running mid pack at best. In the long run I'd guess you are going to be looking at an FXR, Luncheon, CBR150 motor or dare I say it a two stroke if you have the patience and ability.

**Ivan** · 29th December 2011, 21:34

Originally Posted by Henk

I hate to break it to you but an old Honda CB single based motor is never going to be competitive at the sharp end of the field. A CB twin maybe but the only ones running at the front down here have been built and tuned by JC and are the max capacity the rules allow and have had twenty odd years of development, the only Honda singles in the A grade here are GL based, have had serious work and are running mid pack at best. In the long run I'd guess you are going to be looking at an FXR, Luncheon, CBR150 motor or dare I say it a two stroke if you have the patience and ability.

thats the plan tho is to make the motor as fast as I can get it which I believe I can build it pretty damn quick with the right pieces and let the frame make up for the rest of it

**Ivan** · 29th December 2011, 21:36

if one of those motors came up at the right price i would put it in but really i cant be bothered spending big money for something im building for fun, I spent big money on a bike to make me go fast and thats a brand new 450 motox bike this here is just a play bike

**Ivan** · 7th January 2012, 19:14

Well I did a few hours work today hopefully its coming along nicely any ideas ill listen to the tank we have now filled in the holes in the mould sanded it back and its almost ready to make the fibreglass tank out of frames getting there and is looking more like a bike im quite happy it now rolls on its own now need to geta proper shock for it but will be getting that more towards the final stages, the front ends going and making way for the rs50 front end to lighten this down alot! made the subframe if anyone has seen a late model rs subframe the rails on myne are slightly longer due to the tank not being real and just a dummy to give it some support I have welded the mounts for the subframe to the frame so now I just need to put the tank on and I can then mount the seat in correct position,

I cut the bent frame rail out and twisted it into correct position I have even reinforced it by putting a piece of thinner tube in were I made the cuts and welded that into place so it should be strong I have started bracing the chassis now zig zagging the frame but ran out of steel so couldnt do anymore for now

**Moooools** · 7th January 2012, 21:46

Actually looking pretty good.

Burning questions:

1. How long is that swing arm compared to the stock rs125? It look really long in the pics.

2. Will the angle of the shock not make for a decreasing rate spring? (As the swing arm lifts the force becomes more parallel to the spring)

3. What does it weigh?

Aesthetically it looks sweet though.

**Ivan** · 7th January 2012, 23:32

identical length to RS swing arm, looks really long but I think thats cause it has no bracing like the rs so kinda looks longer than it is the wheelbase is the same as a 96 RS125

The question regarding shock I dont know I just mounted it there as it fitted the best there haha and cant really tell as that shock is so soft so it just bounces at the momment

Weight I havent measured it but the frame alone is light theres no weight to it pretty much the new front end is superlight as well the swing arm ways a tonne tho theres way to much weight in it but for now until I replace it it will do

I will try measure it up the pictures aint the best using a shit house telecom 60 dollar phone

**Bert** · 8th January 2012, 19:56

Looking really good Ivan.

**Ivan** · 8th January 2012, 21:24

Originally Posted by Bert

Looking really good Ivan.

Cheers man,
its getting there ill try get some decent pictures of it hopefully have first tank done soon its all just when we get time and couldnt today so hopefully next few evenings i might be able to pop something out

**Ivan** · 10th January 2012, 11:19

come home for lunch and the first tanks in the mould been fibre glassed looking good so far

**F5 Dave** · 10th January 2012, 11:58

hmm, so presumably you used epoxy resin? Or polyester?

**Ivan** · 10th January 2012, 18:20

Originally Posted by F5 Dave

hmm, so presumably you used epoxy resin? Or polyester?

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

**gav** · 10th January 2012, 18:59

Originally Posted by Henk

I hate to break it to you but an old Honda CB single based motor is never going to be competitive at the sharp end of the field. A CB twin maybe but the only ones running at the front down here have been built and tuned by JC and are the max capacity the rules allow and have had twenty odd years of development, the only Honda singles in the A grade here are GL based, have had serious work and are running mid pack at best. In the long run I'd guess you are going to be looking at an FXR, Luncheon, CBR150 motor or dare I say it a two stroke if you have the patience and ability.

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

**Moooools** · 10th January 2012, 19:20

Originally Posted by gav

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

How many dudes you know got the skill to build an engine like that? Not many. If any. Yeah I don't know anybody. (Just call me scribe. Old people refer to this link http://www.youtube.com/watch?v=XUgsupXhnPM)
An FXR is a bit easier to make competitive I would think.

But as for Ivan you have been beaten to the post really. I remember seeing that build from a while back now.

And yes International HT9000 is epoxy.