MB100 development

[husaberg]

AS Dave said for a STD bike 110 would be it.
its not the gearing its the lack of ability to rev higher.
They are simple to tune and easy to work on.
Pipe and carb and a few simple bits would have you up to 140km on std gearing.
But they have shit brakes and tyres. It depends what you want to do.
it would be cheaper to buy a faster bike but wheres the fun in that.

[flyingbrick]

Exactly. Thanks all.

[flyingbrick]

There's some gt125 wheels, forks and brakes on tm. Anyone ever fitted these forks and wheels to an mb100? Decent reduction in weight?

I love the look of em

[husaberg]

There's some gt125 wheels, forks and brakes on tm. Anyone ever fitted these forks and wheels to an mb100? Decent reduction in weight?

I love the look of em

It would be a Waste of time fitting something you cant get decent tyres for.
But Depends on what look you want. Its your bike your style
There is a couple of sites that give bearing cup size for fork conversions
One is ohio cafe racer http://www.ohiocaferacers.com/OCRStemSizes.pdf
the other is https://www.allballsracing.com/index.php/forkconversion
Use mb5 for the bearing size (all small hondas are the same)
Do a complete front end with at least 32-35mm forks and wheels 17 inch sizes to suit.
Any wheel in decent size will be heavier than std.

[flyingbrick]

Thanks mate. Do many people get wider aluminium rims laced into place?

[husaberg]

Thanks mate. Do many people get wider aluminium rims laced into place?

Yip some like F5dave used XL250 rims alloy 2.15x17 on buckets.
if you wait and watch on trademe you can get 3.5x17 rims off torpedo 7 for down to $125-140 esp at Xmas
there was a DR250 rear wheel on TM for !00 offer him 80$ its been on their for a year. they have 2.15x17
Lacing it will cost though you need to know what you are doing try push bike shop but let him srip it so he can measure the off set first.
Something like a CB250RS front forks and Wheels would suit or GL145.
But there is nothing wrong with the rear brake on a MB100 is basically the same as any honda rear drum up to XR500.
But any disc front end with fork is better than a MB100 front end.
On the net there is a Nicie Aussie champ wnining bike that was a H100/MB100
https://www.nmrm.com.au/racing-in-ba...etq-racer.html
here is a list of forks to go with the list of bearings
http://www.perosoft.org/yamaha/Motor...tube-sizes.pdf

or you could find a MB5 fit the MB100 engine and go from their but though they look cooler they are spindly and not common but the MB100 fits with min mods and it can be registered with cheap 50cc reg.
You could likely do the same with a NS50 and a NS1

[flyingbrick]

Thanks tons for all the info mate.

Loving my bike!! Did around 500km within 4 days of buying the thing. Its not that fast but huge amounts of fun.

Have found rd350 reed blocks on ali express for cheaper than a genuine used one.. may place an order soon.

[husaberg]

Thanks tons for all the info mate.

Loving my bike!! Did around 500km within 4 days of buying the thing. Its not that fast but huge amounts of fun.

Have found rd350 reed blocks on ali express for cheaper than a genuine used one.. may place an order soon.

A cr80-85 one is a bolt on with only port work needed. We used RD ones because CR ones were against the rules.
RD ones need two holes redrilled plus two slotted with a chainsaw file or similar.
The tiny std carb and exhaust are a bigger restriction than the ports or reed.
The rd rubber needs the same mods plus a lttle trim of the inside ears but will allow a 28mm carb

[speedpro]

Standard reed is good for at least 19.9hp with a RD350 carb rubber and 28mm carb bunged on top. Standard transfers are good for 22+hp. I used an RD350 reed and it worked great. Replace the petals with a carbon fibre single petal each side and fill the inside of the reed with devcon to guide the air from the carb to the reeds.

[husaberg]

Standard reed is good for at least 19.9hp with a RD350 carb rubber and 28mm carb bunged on top. Standard transfers are good for 22+hp. I used an RD350 reed and it worked great. Replace the petals with a carbon fibre single petal each side and fill the inside of the reed with devcon to guide the air from the carb to the reeds.

Thanks tons for all the info mate.

Loving my bike!! Did around 500km within 4 days of buying the thing. Its not that fast but huge amounts of fun.

Have found rd350 reed blocks on ali express for cheaper than a genuine used one.. may place an order soon.

I have a spare late CR85 reed here if you can con Mike into fitting it for you (i will send it gratis to mike) I LIKELY HAVE RD ONES AS WELL
I am pretty sure i have a CR85 28mm carb to.
I think i might have a 6 speed box left also that i would exchange for something of similar value ie yam forks or something for a current project.
But same condition that it gets fitted and used.

[flyingbrick]

I have a spare late CR85 reed here if you can con Mike into fitting it for you (i will send it gratis to mike) I LIKELY HAVE RD ONES AS WELL
I am pretty sure i have a CR85 28mm carb to.
I think i might have a 6 speed box left also that i would exchange for something of similar value ie yam forks or something for a current project.
But same condition that it gets fitted and used.

Sounds great mate, lets do this!!!

I'm a fitter turner by trade (project manager now) so with a little instruction can probably make CR fit. I have a cheap new 28mm carb here but definately want to go with whatever is easiest in terms of fitment.

Not much I can help with in terms of exchange- will have to be cash :-D

Where are ya based?

Edit- jusut noticed the other replies to this thread. FArkin good information, thanks everyone.

What you chaps talk about HP, is this wheel hp? So 20hp is likely more than double the factory 11(engine)hp?!!!!!

[husaberg]

Sounds great mate, lets do this!!!

Is there any performance difference between CR85 and RD reeds? I'm a fitter turner by trade (project manager now) so with a little instruction can probably make it fit. I have a cheap new 28mm carb here but definately what to go with whatever is easiest in terms of fitment.

Not much I can help with in terms of exchange- will have to be cash :-D

Where are ya based?

Other island left side
You will have to get Mike Spedpro on board.
Two stroke tuning and MB gearboxs conversions are a little harder than they look. I am sure you possess the skills but mike has vast experience
My misses would spend cash but is currently unable to spend bike parts
I think i have a tacho here if yours doesnt as well.

[flyingbrick]

No problem mate. We can sort something out. You guys on facebook?

[husaberg]

I found this
ESP made for the MB series i dont know what a RD inlet ges for new but all the second hand ones will be hard as steel and cracking by now.
https://www.jmpbparts.com/manifold-2...nda-mb-mt.html
$66 NZD plus post


Okay New RD ones are $48 nzd ON TRADEME
https://www.trademe.co.nz/motors/mot...1adec65f13b642


You could make one like dave Did

Standard reed is good for at least 19.9hp with a RD350 carb rubber and 28mm carb bunged on top. Standard transfers are good for 22+hp. I used an RD350 reed and it worked great. Replace the petals with a carbon fibre single petal each side and fill the inside of the reed with devcon to guide the air from the carb to the reeds.

For mike this is what a late cr80-85 reed looks like save a bit of trouble modding a RD inlet to two reed.

They are also ever so slightly slightly asymmetrical.

[F5 Dave]

MB50 gearboxes fit right in, no mods. You won't get that sort of power increase without increasing the revs to race levels. The crank will die if you don't rebuild it and ask power from it but are reliable when built with decent parts. It will then need a pipe. Chassis mods like disc front will require LVV certificate.

As a road bike is this really worth it?

An RZ350 will be much more fun if you can afford it and still make the right sort of noises.