Do You Moto 100?

[Nathan S]

2-stroke = 100cc
4-stroke = 125cc.

[Quicksilver]

I hope it pre78 and not pre75. Suzuki TC100s enter and some of the Honda CT125s as well. Common easier find old ag bikes that have no gains over earlier models but did sell in higher volumes. Cheap and easy to keep running.

[Wombat]

Ag bikes sounds good!
I'll be keen to try this as I'm in it for the participation and not the win!

[Quicksilver]

Ag bikes sounds good!
I'll be keen to try this as I'm in it for the participation and not the win!

Yup. Reckon. I was hoping to set up a 78 CT125 I have for the class. Has a nice big triangle seat for my fat arse. 

[Doc]

yup, keep it pre'75 cut off keeps everything on a level field. I don't see a problem with TS90MX's or MX100's personally as both of these models came directly from their trailbike brothers. There will always be people who go for the hotties but I believe another amendment to the rules should include 'unleaded pump fuel only - no racing fuels allowed permitted'

Add to the list
A100,A80 suzuki
CD90's/CD125's Honda
TMX100 Bridgestone
HT90 Yamaha
KE100 Kawasaki

'If' the XL75 makes the list and this is in reality is a mini, could this mean TS75's/50's and KM90 kawa's are eligable as well? Sure wouldn't hurt and they are not MX bikes 

Quicky if it's kept pre'75 the 2 piece head motor type such as the later CT125 will not be permitted. What's wrong with the SL100??

[Noel]

Hmm
Doc just brought up the question
will there be fuel restrictions,
Methanol burning CL90

[Doc]

hence why I put that particular issue in my previous post Noel  I specifically thought of the injected CT90's on gas!    Do I detect a late model CDI CT motor there? 

[Quicksilver]

I really dont see any advantage of this CT over the other.

[Mick22]

The main advantage is the size of the ports and the crank in the CT125 you can do a lot of work to the CT and it will keep going, thats why nearly all road race buckets are based on the late ct/sl/xl engine

The early engine is very limited you can only do so much before the crank gives out, it has tiny mains and a small rod.

[Tim754]

Quicky I have done both engines at times and made the same power from both.The two piece heads are nearly all post 75 mostly CDI. Some very early CT125 Agis (no XL125!!) as you have pictured may by there sneak in as built in 74.These very rare items all had points too not CDI.  The bubble tank no problemo ;)Tim    Oh I have one SL100 engine here on 220cc and have not shit a crank yet on it in 21years...............................

[Nathan S]

My recollection was that the XL75 was a larger bike than the XR75. More akin to the SL100/XL100 size, with 19/17" wheels, rather than 16/14".
Could be wrong, although I do recall seeing adults riding them without looking too silly.

Of the bikes mentioned so far, what's a rough order of competitiveness for mechanically stock examples?

My guess of the bikes I think I know anything about:
YZ100/RM100 (if you allowed pre-78)
Daylight.
TM100.
Daylight.
MX100.
TS90MX.
SL125.
DT100.
TS100.
LT2MX.
SL100.
TS90.
LT2/1.

Keep the jungle-juice out of it. The bikes that currently exist that run on it were built to fit into different categories - and will be free to keep running in those categories.

Maybe a rule that out-laws anything that was originally fitted with a 21" front wheel would be a good idea??!?
Actually, maybe that's all that's needed - limits on engine capacity and wheel size??
The SL125 has a 21 though, doesn't it?

[Mick22]

Yeah Tim i've got a 215cc 10.5:1 comp SL100 (with your old pipe on it) that I use just as a muck around bike and its fine, no dramas but soon as you get them up to 14-15:1 as a 125cc they bend the rod when they are being held at revs. No one that runs in buckets at the moment that isn't using the late engine is even in the ballpark as far as speed goes, lots of guys have tried and the early engine just doesn't cut it. So it ends up being 2 races one for the guys on hot CT/SL 125 late engines and everyone else a mile behind.
You know what the old bucket class was like at Broadford I just reckon it was more fun when eveyone was on bikes of roughly the same speed.  Everyone starts out saying "i'm just doing this for fun" but by the second round guys will be building hotties at least the earlier engines are self limiting, you can only do so much before they break

[Wombat]

 Everyone starts out saying "i'm just doing this for fun" but by the second round guys will be building hotties...

Not me, but I can see most of you will have an absolute ball with the mods.
I'll be taking the lights off, number plates on and petrol in.

The whole concept is taking shape beautifully and there's a real buzz in the air - great init?!

[Yamaboy]

I like Nathans wheel idea. Why not have a rule stating that bikes must be fitted with the original sized wheels that came with the bike. I also think that keeping it pre '75 keeps the performance parameters within a cooeee of each other. I'm not an expert on those CT Hondas with the split head but I think you're leaving it pretty open to run a 185 or 200 engine on the sly. The early engine is restricted by its crank as mentioned and even a 150cc version isn't that much quicker than a 125. Also, keep the minis out. Make it for full sized bikes only. Let's not over complicate this. The KISS rule should prevail.
Add...Hodaka Ace 100, Bridgestone 90, Puch 100, Gemini 100 and what about allowing BSA Bantam 125s in.

[vandy010]

i think small forks were mentioned earlier and i agree with that one.
gimme the AG100 for sure! and where does that leave the good old Honda postie bike? should it be counted in too? i'd give it the thumbs up.
i also like the idea of some early model 80's but would be happy to just have a bike to share in the fun.
i'd imagine this category to take some time to refine.