i too have had the exact same problem with my cub, Pete Kirby clutch and a clutch lightening kit from Armac's arch enemy!
i too had a too light clutch action, so much so that it would not pull the clutch lever away from the handle bar. Even when using the inner most of the adjusting holes on the arm.
i resolved the issue by re routing the cable to the right hand side of the cylinder, making a new anchor point for the end of the outer ( see a Honda single engine for inspiration) and using the inner most of the lightening holes in the arm to actuate the clutch.
It works, and the clutch cable has a much smoother run..
The engine is as simple as it is possible to get an ohv single cylinder engine. Get a Haynes manual for a cb125 and off you go. There isn't too much you can really do to them. Make sure the cam bearing faces are 100%.
rear suspension has to be a set of either rock shocks or falcons.
front suspension is really use a set of TLR forks, wheel yokes etc. I fitted a set of marzzochi forks and wheel from a 300 fantic. But it was a load of hassle getting it to handle as good as the reflex geometry.( with cut frame.)
I always use Talon engineering to build my wheels, and either use Talons own rims or excel rims.
There are a few different after market exhausts for sale, I preferred the "Delkelvic" but it's down to personal taste as much as performance.
get hold of a TLR sump guard as the steel reflex one is rubbish.
as to handlebars I prefer fat bars but others like conventional braced bars. The reflex and TLR both have the clamps quite a long way behind the fork legs. I converted my yokes to a more modern position. It's not simple but it is possible. If you want to go down that route I can tell you how I did it or I can do it for you.
Had the same issue with my cub, it too had a distributor. As has been posted before machine a push fit bung or better still a breather.
The engineer in me wants to clamp it using the original distributor clamp but as the welder in me has already welded the hole up in the outer case, that is unlikely to happen now!
I'm having similar issues with a Honda TLR, lts got 35mm marzzochi forks in at present but was getting strange steering issues when using Fantic yokes
I have hopefully resolved it with hybrid parallel yokes honda offset from steering stem centre to fork tube centre but Fantic fork tube spacing.
How are you measuring trail? It's a strange measurement just about everything affects it except the colour of your underpants.
If I'm about to teach you to suck eggs ignore the next bit!
It is measured by projecting the centreline of the steering head to the floor. ( flat and level ). Then project a vertical line through your front spindle again to the ground.
The difference between the two lines on the floor is your trail measurement.
A common mistake to make is to use the centre of the fork leg. The fork leg is almost always in front of the steering head and on production yokes not even parallel to it.
The first 4rt had the same yokes as the later 315 monts. They are all 7/8 bars. They are much thicker where the steering stem comes through the yoke. I have converted these to take fat bars but you need motox clamps and to be handy with a TIG welder and a milling machine.
The later yokes are all fitted with fat bars, and are much thinner in the steering stem area. But to my mind the bars are mounted too far back. These are much easier to convert by using renthal bolt on fatbar clamps, you can move the bars much further forward. You still need to have a TIG Welder and a milling machine.
Hi I converted mine, Cut or mill off the clamps, weld up the holes and machine it flat and tap them to take renthal fat bar clamps or S3s excellent adjustable clamps.
Hi the best advice I was given with my first 4rt was ride it for a year before you really judge it. They were bang on too.
As has been said big master cylinder on clutch.
Mitani clutch plates if you can get hold of a set.
Don't be afraid of big gears either it helps find grip!
The best thing and the worst thing on a 4rt is the fuel injection! It is always spot on. BUT the first power stroke is sometimes just too fierce and brakes traction a mappable throttle body can help calm the initial surge down but it will come with time on the footrests.
No ball fitted just the mushroom against the flat of the shaft. The mushroom doesn't spin as the outer edge of the mushroom presses against the inner race of the bearing mounted in the centre of the clutch.
Much easier in a lwb obviously. If you turn the front wheel and load them rear wheel first they should fit fine. I changed myT4 to a caddy maxi and can get two bikes in that and keep one of the middle row seats too.
If you need an internal rack making get in touch .
The top yoke is very similar to the type made by Eddie Dow and would normally fitted as a replacement top yoke when fitting clip ons for road racing or making a cafe racer, as they have no handle bar mounts.
Same name, new owners, Rick & Laurence. Ex employees, have taken on the name, most of the trials stock, and started up again in a new shop.
Here's a bit from their new website !
BVM Moto has now relanched under new ownership, with familiar faces and a household name is ready to serve loyal customers........
After BVM Moto in Stroud, Glos, sadly went out of business early in 2014, longstanding employees Rick Ferrier and John “Laurence” Luff established an all-new company and bought the BVM name which is so familiar to trials riders across the country.
The main focus of the business is mail order - the BVM website has more than 1,500 stock lines and is being updated all the time – but the new premises in Woodchester near Stroud has a counter to serve walk-in customers who are welcome to talk trials.
While the ownership is different, Rick and John are adamant they will be maintaining the standards of service that customers have enjoyed for 35 years, with their purely trials-focused store specialising in spares, consumables, clothing and equipment.
For a lot of customers, ordering over the internet is a really easy way to shop but we know how much they also value a shop which is more than just about sales. For more techinical inquires, it's always best to call. From clutch baskets, to wheel bearings to engine spares, we are happy to supply and advise you. Even if you just want to talk about tyre pressures we are here to help.
Many parts for trials marques including Beta, Gas Gas, Jotagas, Montesa, Ossa, Oset, Scorpa and Sherco, plus twinshock and pre 65 makes will be available off the shelf, after we bought much of BVM's stock from its large parts department.
With more stock arriving daily we are aiming to offer service in line with BVM in its prime, we have almost 50 years of trials knowledege bewtween us and have competed successfully in many national trials including the SSDT
We are totally trials focused and are relishing the opportunity to move the business forward, with customer service as the number one priority.
The new premises at Unit 20D Merretts Mills Industrial Estate, Woodchester, just off the main A46 Stroud to Nailsworth road, is taking shape and is open for business.
BVM Moto can be contacted on a new phone number, 01453 297 177, or via email sales@bvm-moto.co.uk
Just get a future alloy pump mounting plate. It weighs loads less than the steel original .i just use a huge cable tie to clamp the pump to the mounting, others use a stainless jubilee clip.
Funtrials i like people who like trials and you do appear to be rather passionate about your sport and your preferred rules.
However not everybody shares your view and you would do well to develop a little more respect for the opinions of others who share your interest if not your particular view on no stop.
In the uk in terms of people who ride its maybe 50/50 in terms of preference i would suggest. I'm happy to ride stop permitted but prefer no stop trials. No stop at the wtc is an experiment which should be allowed to run its course without starting boycotts, its not necessary.
We are a minority sport so we need to stick together. Now go and ride your bike however you please, riding bikes is far better than arguing.
Sidecar observation and marking
in Sidecar Trials
Posted
A good way to understand the whole sidecar thing is to bolt one to that matchless, just think you wouldn’t need a side stand.