alan

Looks more like a Yamaha xs 650 motor .. Where have the results being published ?

Norton are 1 3/8 " . The aim is to get the damping and seal arrangement of the more modern fork with the appearance of the old fork. Norton or AMC sliders are normally used as they are a bigger diameter than Triumph or BSA. The "easiest" way is too machine the OD of the more modern fork slider down so that it fits inside the Norton or AMC slider. There are people now casting new Norton style legs and others machining Triumph style legs from billet to take 35 mm stanchions, dampers and seals directly.

Norton are 1 3/8 " . The aim is to get the damping and seal arrangement of the more modern fork with the appearance of the old fork. Norton or AMC sliders are normally used as they are a bigger diameter than Triumph or BSA. The "easiest" way is too machine the OD of the more modern fork slider down so that it fits inside the Norton or AMC slider. There are people now casting new Norton style legs and others machining Triumph style legs from billet to take 35 mm stanchions,bushes, dampers and seals directly.

I think you are missing the point, the big bike riders are not out there in the numbers you imagine. Look at the club video's from the 90's.. many of the riders on big bikes then are still riding now, but are all now in their 60's or older. Even a steady trial is a work out on a big bike, and a simple mistake can lead to a big injury. The older riders are choosing light weight bikes in order to carry on riding. The real problem is that there aren't many "young" riders coming in to replace the older riders. The natural progression is for riders to come from twin shock or modern trials as they get older, neither of these disciplines would lead to a rider to choose a big bike. Yorkshire Classic has a couple of very young members on big bikes, but these are the exception rather than the rule. The club does not see big bikes as an inconvenience, in fact quite the contrary. The pre-unit trials are aimed at the big bikes, but would not be financially viable without the support of the non-competitive lightweight machines. As stated previously the bike bike trials are run at a loss, which the club accepts to keep as many of these bikes turning out as possible.

I wish you good luck in your endeavour, however the situation in Yorkshire seems much healthier. Yorkshire Classic had over 160 riders on the results sheets last year, all club members. If you include the captains trial which is open to non-members this swells to over 200, mainly within a 20 mile radius of Keighley. Interestingly, the least well supported trials are the "big bike trials" designed to attract the older riders on more original machines. Conversely the best supported trials are those with a reputation for being on the more difficult side, and these naturally attract the highly modified machinery. The profit from these trials goes to support the big bike trials that run at a finance loss, despite all the organisers, observers and most land owners doing every thing for free. The club remains in a financially healthy position so must be doing something right. The machine examiners are fairly pragmatic, but do intervene when someone is clearly taking the mickey. And yes, there are some anomalies in the club rules, but these were voted in by the membership, and can be voted out by the membership at the annual AGM.

I can find one UK stockist that can get hold of this part.. is it by any chance interchangeable with the TLR 200 ? I believe the TLR 200 part number is 23221-446-000, but this seems to be unavailable any where. By the way, I am not sure if you intend to weld the sprocket to the shaft.. ​A better solution may be to grind the teeth off an old sprocket with good splines and weld the centre to the outside of the new sprocket. You need to tack them together on the shaft to line the splines up (don't go mad and melt the oil seal). Once welded the old centre will be driving off the unworn splines outboard of the groove. The only thing to prevent the sprocket coming off the shaft is now the cover, but if the chain is in line this should not be a problem.

The kick start problem sounds more like a gearbox issue than an engine problem. Wear in the gearbox bushes and the sleeve gear bearing can cause the gears not to mesh properly. Have you tried Kicking it over with the clutch pulled in, when the kickstart goes tight ? I suspect that when you have the plug in, the extra load on the main shaft pulls it out of line. removing the plug takes the load off. Pulling the clutch would have the same effect. The main shaft passes through a bush in the sleeve gear, the sleeve gear is then located in a bearing in the gearbox housing. The sprocket is then splined onto the sleeve gear. As mud gets packed into this area, and is often pressure washed out,it is quite common for both the bush and bearing to be badly worn. If your crank cases have been cut away, you may be able to see movement in the sprocket by pulling on the chain with the bike in gear. To check for play in the sleeve gear bearing and bush, you really need to remove the clutch plates and get hold on the clutch centre and check for play.

The cub clutches are notorious for slipping especially when you increase the engine power and/or reduce the primary gearing (yours looks to be standard). It is common practice to just put around 50 to 100 ml of automatic transmission fluid in the case, just to lube the chain and the bearing between the clutch drum and clutch basket . This bearing only runs when the clutch is pulled so is lightly loaded. Cubs converted to belt primary drive run dry. There are several places the gear box can leak and no real cure, it is just case of regular top ups.

http://vans.honestjohn.co.uk/van-reviews/mercedes-benz/citan-2013/?section=good

Yes, at tick over it should fire around 5 deg before top dead, the built in advance will take it to around 30 deg before top dead when you rev it. I cut a template with the 5 deg angle so i could quickly mark the stator. Put the engine on tdc and mark the stator with white paint or tipex at tdc and 5 deg before tdc . Run the engine to see where it is firing now. If you have to move the stator dont forget the marks will now be out, remove the original marks and re- do them and strobe it again.

Depending how long ago you got it, UPB used to sell PVL or Electrex world ignitions as their own brand. The mark you are using could be the point when the spark occures rather than the TDC mark. In which case you will be around 5 degress retarded. The only way to set the timing is use a strobe.

As Totalshell said, At Yorkshire classic there is a clubman class for specials in their Championship trials. At a pre-unit trial only pre unit bikes and twins run in class, all others run in a non-competitive class. There is only one route at the pre -unit trial which is set on the easier side to suit the bigger bikes and rigids. The trials are run under AMCA so no licence required.

The "rules" vary from club to club. It appears to retain a swan neck head stock, frame rail under engine, the forks and hubs "look" like triumph and the shock mounts don't appear too radial (although angled more than a standard cub. The only issue I can see is the rear subframe is far from being recognisable as the original, therefore most clubs would only accept it as a special

dont know if they are good .. but try Yamaha TY175 ,

all details now on http://www.northernbritishbikechampionship.co.uk/

Anyone know how many reserves have been called up so far ?

TLR200 are 35mm reflex are 32mm

Hi TTSPUD The YC Big bike trials was not a one off event, its series of 4 rounds every year that has run for at least two years that i know of. Bearing in mind all other YC trials get entries of at least 30 to 40 riders ( and regularly get more than 60), the entry is disappointing. Had there been sufficient interest I am sure more rules would have been introduced.

The original intention was to get riders past and present to pull old bikes out from the back of the shed, and provide sections that didn't need trick bikes. The complaint was that the "pre unit" trials run by Yorkshire were too hard on a rigid bike. The series rules were set to be inclusive rather than exclusive to get the numbers up. The reality seems to be that the interest just isn't there. There seems to be just a handful of riders that give their old rigids a run out. To be commercially viable, if you pay landowners and observers you need at least 40 riders. Be interesting to see how many people would be interested especially with a set of rules to work to.

Hi TTSPUD You don't say where you are, but Yorkshire Classic run a Big Bike series aimed at bikes like yours. They don't exclude "trick" bikes the only stipulation is pre unit four stroke. There is only one route, laid out on the easy side. There is nothing a rigid Ariel or similar couldn't cope with. The series has run for a few years now but the entries are very low. The £10 entry fee barely covers the insurance and admin costs. The series only survives on the generosity of the landowners and officials as they do everything for free. The question is why are the entries so low (often less than 10 riders). One answer could be that Yorkshire run plenty of other trials, many of the pre-unit riders find the big bike sections sections too easy so stay away. .

Might be a bit drastic to have the whole entry on one day, but there will be some of the more senior (or injured) riders that may prefer only doing one day. Even if it was only 10 or 20 places it would mean that many fewer dissapointed riders. Ok the route is different each day, but for most that might elect to ride only one day, it is the taking part that counts and I am fairly sure most would happily accept been grouped into a "one day" result category.

they are on yorksclassictrials.co.uk.

http://www.ssdt.org/downloads/2013/Pre-65/2013%20P65%20Results.pdf looks like they used most cleans, followed by most 1's, then 2's then 3's then 5's.

As a previous victim of bike theft, my guess is that that incidents are unrelated ( alan whittons was an opportunist theft of a van that happened to have a trials frame inside) . Unfortunately off-road bikes are desirable items amongst the criminal classes, I can well imagine that some one spotted Bob's either on his rack at the back of his motor and followed him a mile or two home, or saw him washing it on his drive and decided to come back later and take it. Sorry Bob, but my guess is that the theives won't give a monkeys about how special it is,it will be thrashed around their local quarry or woods until it stops... I am not familar with your surrounding area, but if i was going to look for it I would start with woods and quarries rather than organised events. Hopefully you are well insured. The only moral is keep any bike out of sight the best you can, and protect it well.

No we are not getting there at all.. you are the only one that seems to think that the wheel spindle needs to be mis-aligned.