JDR bike build

[Ivan]

Im going to have no linkage system either so it will be frame mounted then directly on the swing arm, kind of like your RS chassis except it wont be horizontal set up it will be vertical

[White trash]

While a PDS rear shock system is obviously easier to mount and get going, it's far more difficult to alter the rising rate should you wish to a later date, whereas a linkage is fairly simple to make more or less agressive as needed. How are you calculating the correct measurments? That shit gives me a major headache.

[Yow Ling]

While a PDS rear shock system is obviously easier to mount and get going, it's far more difficult to alter the rising rate should you wish to a later date, whereas a linkage is fairly simple to make more or less agressive as needed. How are you calculating the correct measurments? That shit gives me a major headache.

With at least 100 fxrs, all early rs125, and all twinshockers using the system that Ivan is going to use, there is a possibility you are overthinking this. Measurments are usually calculated by where the shock looks best, and which bit of the frame and swingarm are reached by the shock. Adjustments would normally be considered later. this is buckets !

[Ivan]

Haha Yow is onto it,

I Havent even started on the rear shock setup yet

[White trash]

With at least 100 fxrs, all early rs125, and all twinshockers using the system that Ivan is going to use, there is a possibility you are overthinking this. Measurments are usually calculated by where the shock looks best, and which bit of the frame and swingarm are reached by the shock. Adjustments would normally be considered later. this is buckets !

A very valid point, hadn't really thought of it like that. All good chasis builders had to start somewhere I guess.

[quallman1234]

Looking great ivan, keep at it... I'm sure you'll learn plently from this experiment and make even better frames in the future.
Hopefully we'll see it rolling...

Are you going to make your own swing arm?

[Ivan]

I mean the plan in future is to get the jig sorted 100% now and then give it to a engineer to build me a chrome molly chassis for F3,

But I have a dirty idea to build something in between this frame and the length of a modern 600 so it will be relativly short and not as high and have a f2 bike built kind of NZ's first Moto2 bike I guess but thats just a idea not a plan,

If I build a F3 version of this it will be running a linkage system and what not

Its actually a shame the shock has to run there as I wanted to build a underseat exhaust system for this but looks like its going to have to be a under motor system

[boostin]

Its actually a shame the shock has to run there as I wanted to build a underseat exhaust system for this but looks like its going to have to be a under motor system

You could look at moving the shock to the front of the engine like the Britten did.

Like this?

http://www.facebook.com/photo.php?fb...7106964&type=1

[Ivan]

to much effort for a underseat exhaust system

[Bert]

You might find this slightly interesting:
http://thekneeslider.com/archives/20...n-250cc-racer/

It made me smile when I read about it.

just noticed that its already been posted

[Ivan]

thats pretty cool link, nothing new on myne so no updates

[Ivan]

well nw I regret not going to a linkage setup as this direct mount is a pain plus I really need a new swingarm mynes bent and will take abit to get straight and weighs a ton at the mo I spent the first bit of time on it in ages the other week since my 450 got stolen I have had no bike so want to get something going looks pretty cool so far

[Bert]

well nw I regret not going to a linkage setup as this direct mount is a pain plus I really need a new swingarm mynes bent and will take abit to get straight and weighs a ton at the mo I spent the first bit of time on it in ages the other week since my 450 got stolen I have had no bike so want to get something going looks pretty cool so far

photos mate. give us a looksee at your workman ship

anyone got a honda 125 ignition setup for cdi like stator flywheel and cdi?? my current bottom end is points and top end cdi and was hoping to convert it without going total loss

I've got an old SL/xl 125 flywheel and magneto (and most of a motor); but I also have another mini rotor (new) that should fit. give me a yell; maybe you should pop up and grab a swingarm from the local bike wreckers at the same time (he's cheap as chips)..

[quallman1234]

well nw I regret not going to a linkage setup as this direct mount is a pain plus I really need a new swingarm mynes bent and will take abit to get straight and weighs a ton at the mo I spent the first bit of time on it in ages the other week since my 450 got stolen I have had no bike so want to get something going looks pretty cool so far

Weld a piece of channel to the middle of the swingarm and same to the frame, drill a hole through the channel, and theres your mounts .

[Ivan]

photos mate. give us a looksee at your workman ship




I've got an old SL/xl 125 flywheel and magneto (and most of a motor); but I also have another mini rotor (new) that should fit. give me a yell; maybe you should pop up and grab a swingarm from the local bike wreckers at the same time (he's cheap as chips)..

send me a message if you want to part with motor?