mb100/h100a/h100s

[dave o]

i have an mb100 and was wondering if there is any difference to the h100a? and whats the difference between h100a and h100s?

cheers,
dave

[F5 Dave]

yes. MB is quite different to the H100, but also quite the same. The H100 A & H100 S are more the same than they are different, but in a different way unto which they are similar.

oh all right, MB has different frame & running gear, also different barrel & head. Bottom end & piston are the same thus top ends interchangeable but won't fit back into frame. Porting on MB probably a bit racier. H100 A & S might be minor changes, some have points, some CDI, think some gearbox change pattern difference exists. All make good buckets & accept MB50 6 speed normal gearboxes & better ignitions.

[nudemetalz]

I used to race an H-100 bucket racer back in 1989....yup that long ago.
I put an MB-5 six-speed in and it made a world of difference. A pipe, a bit of porting and a bigger carb - she used to go quite well.
Standard frame, brakes and suspension, meant she was also a handful !!!!
(I'll see if I can dig up a photo of it).

You can port them to CR125 (air-cooled) specs fairly easily.

My opinion was back then, the GP100's were a better machine as they could be made to go faster than most others.

[F5 Dave]

89, Hey, that's when I had my MB50 racer. Did you used to frequent Ohakea or elsewhere?


Hey Dave, you joined a scant 3 weeks ago & the screen name dave wasn't already taken? Sheesh! Would have thought you would have had to be dave306 by now.

[nudemetalz]

89, Hey, that's when I had my MB50 racer. Did you used to frequent Ohakea or elsewhere?

No, I used to race out at Wigram at the aircraft parking bays. We used to use part of the taxiways as a long straight.

Then in the early 90's, we migrated to Carrs Road Kart-track, not without a lot of political problems from the president of that association back then.
We got it sorted though.

[F5 Dave]

Went down & raced at the last Wigram GP thingy. Did Carrs road ~ 3 yrs back but think that was a one off thing.

[nudemetalz]

I ended up building a CB125 twin which I styled like Freddy Spencers CB900F superbike.
I gave the engine a good tune too.
It was harder to keep up with the GP/H/MB 100's but a lot of fun.
But with a loud 2:1 pulling 15-16,000 rpm she sounded good !!

[CM2005]

I ended up building a CB125 twin which I styled like Freddy Spencers CB900F superbike.
I gave the engine a good tune too.
It was harder to keep up with the GP/H/MB 100's but a lot of fun.
But with a loud 2:1 pulling 15-16,000 rpm she sounded good !!

Yeahyah! Heard(and rode!!) i CBt for the first time on satutrday, at the Mt Welly bucket track, sounds awesome, and lotsa of useable power.. not like my XL, but lots for a 125 "commuter".. have you got one anymore?
Good to hear the strokers were holding you at bay!!

[nudemetalz]

No unfortunately, I am very tempted to build another though.

A trick I did was remove the fly wheel completely and then run it total-loss ignition. It made it rev really freely.