[Bantam / Cub Swing-Arm Length]

The OD is 28.72mm

The ID is 23.5 to 23.79mm (slightly oval) I would guess the original tube ID was 15/16”??

It also has a ridge of braze where the tube is seem-welded

Hope this helps

[Moving A Cub Engine Over To The Left]

I think OTF is getting confused with the term offset?

Both wheels are parallel but if you draw a straight line on the floor one wheel is offset to the line but buy 'x' amount

[Bantam / Cub Swing-Arm Length]

Sorry, can’t remember what size I made the bushes .. I have an old swing arm somewhere I will try and measure it up over the weekend

[Carb Freezing]

http://www.opieoils.co.uk/p-809-silkolene-pro-fst-fuel-system-treatment-for-petrol-engines.aspx

[What's Happened To Trials In The Midland Centre ?]

yes two routes, easy and even easier

Its so obvious now you point it out, I’m sure every novice rider would know that!

[Is This Alright?]

Been alot of posts on this subject,

You can use 10/40w light gear oil but not synthetic.

The following is cut + pasted from the GG tech bulletin; Not from the manual but bear in mind it is just recommendation !

Transmission oil:

Recommend type: ATF DEXRON III

Alternatives:

NOTE: GASGAS Spain recommends only Dexron III automatic transmission oil at this time.

Oil type warning:

DO NOT USE #12378508 GM auto-trac II (blue) oil

Never use synthetic oil in the transmission~clutch. The synthetic oils are “stickier” and this adhesion tendency, when applied to the areas between the clutch plates contribute to excessive clutch drag. Some brands of synthetic oil will chemically react when mixed with water, (from creeks, rain, or waterpump seal leakage). This reaction alters the pH factor of the oil. This acidic condition accelerates corrosion of steel engine parts, and loosens the bond of the clutch fiber plate material. Please do not second-guess this information. We have twelve years of experience with the Herbringer/Adige brand clutch plate materials, and we are in direct contact with the technical department at GASGAS Spain.

DEXRON III is synthetic (DEXRON II is mineral)

So the above seems a bit of a Contradiction?

[What's Happened To Trials In The Midland Centre ?]

stourbridge trials have a reputation for having a routes suitable for all the above mentioned , cant see how they can make the easy route any easier

They may well run an easy route, but all it says on the event calendar is two routes?

Might be worth stating a dead easy route, how do new riders know what to expect?

[Is This Alright?]

Do motorcross bikes have the Same kinda wet clutches

Yep, with a lot more power going though them

[Is This Alright?]

I used 10W40 car oil in my motocross bikes for years never had any problems,

[What's Happened To Trials In The Midland Centre ?]

Maybe if all clubs run a novice, dead easy route it would attract more riders?

I offered to lend my friend a bike to have a go (he as been dying to have a go for a while), but he declined when he watched a trial said it looked way to hard (that was at shatterford)

[Pre-Mix Ratio M91 Bultaco Sherpa]

I use 40:1 for my Suzuki Beamish (Castrol TTS) It runs very well at this ratio

[Beamish Suzuki 1970S Photos]

I went out on my beamish yesterday, can’t believe how much grip it has in the wet (until my chain came off in mud deeper than my boots)!

[Beamish Fork Tubes]

Just tried fitting a set of beamish forks I have lying around on my BSA, but the fork tubes seem to be smaller than 35mm this is stopping me clamping them on the bsa.

I’ve measured them and they are 34.87mm which seems to be closer to 1 3/8” did the beamish have odd sized forks?

[Spindle]

how can you have a pre65 pit bike!!!!!!!

the alloy you need is: 2014A

[35Mm Yokes For Scotland.]

What about these, I don't know what Alan Whittons are like ????

nice looking yokes

do you ever ride in the BMCA trials?

[Bantam / Cub Swing-Arm Length]

3/4" to 1" seems to give just the right amount

make sure you have the wide type arm to start with

[Njb Expert Shock]

I've used NJB before with no problems, they worked well

But NJB need to be fitted upside-down to work (chrome rod at bottom)

[C15 In A Bantam]

does anyone know how much the frame kits are?

I might put mine on ebay and start again!

[C15 In A Bantam]

thats a nice bike

[C15 In A Bantam]

Does anyone know if a C15 engine will fit into a bantam frame?

I’ve built a rolling chassis for my bantam, no engine but I do have 3/4 of a c15 engine!

[Telford Show]

It was a good show but the autojumble was a washout today, generally not as good as previous years?

[Trick Forks]

Does anyone know what type of Norton sliders are used to make the trick forks?

[Bantam / Cub Swing-Arm Length]

Hi Guys.

Hi Suzuki.

Bad Engineering practice extending the arm like that, now you have two welds to break?

Do your homework on the hubs , it is far cheaper to buy some than to make your own. And you know the ones that are already tested work, been there as they say, Give Alan a ring.

Regards Charlie.

I would disagree on the welding, I have inserted a bush into the swing-arm (see pic) even if they were butt welded I would be surprised if it did fail as most of the stress is transmitted though the shocks the swing arm acts more like a control arm than on a modern mono-shock bike (but I’m not the best welder!)

I have worked many years as an Automotive prototype engineer / quality engineer, after serving a technical engineering apprenticeship so I would hope my work would be satisfactory

But I would agree its not worth the time making parts, if you don’t have a CNC machine. But I’m in the process of buying one

I’m sure you would agree most of the fun is making your own parts, I find it very satisfying

[Bantam / Cub Swing-Arm Length]

I’m now in the process of making my hubs and yokes, yokes are nearly finished just need to make the spindle and bar risers

It’s taking a little longer than planed as don’t seem to have a lot of time at the moment (wifes just had a baby!)

I will post some pics of the hubs soon

[C15 Bearings]

thanks