trialsrfun

I think it was due to owning a new but completely undeveloped, uncompetitive bike that was quite unsuited to trials especially when compared to the rapidly improving Spanish machines. Also they had very little residual value depreciating as fast as a freefalling brick.

Could be any of the above but a weak point on the TY175 carb are the O rings especially the one around the main jet, they need to be intact and a good fit.

Are there two spark plugs or two systems fed to a single plug?

The difference is two spokes a side which as I understand it would make them completely incompatible.

Is the engine as in the JGas (it looks very similar) or a different unit.

Well done Adam Raga a great result on the TRS. Do they ride through any mud in the outdoor championship?

Will TRS, JGas and GasGas share a common engine then?

The earlier rubber sprung Greeves forks have the brake plate torque arm fastened to the lower link so that when the brake is applied the suspension stops working and the forks rise to their full extent, later forks and both types of banana fork have a fully floating brake plate so the suspension continues to work under braking. Most later model Greeves were factory fitted with Ceriani forks as was the one ridden by Bill Wilkinson to win the SSDT.

Detail differences only between the two types of fork with spring dampers, both are banned. The earlier rubber in torsion type though probably not too different in suspension performance are I believe elegible for P65 entry. The last British bike to win the SSDT was a Greeves Anglian with Ceriani forks ridden by Bill Wilkinson in 1969.

Yes they are Deryk, exactly like the ones fitted to the Anglian you used to ride.Surely now is the time to allow all Villiers engined Greeves bikes into the P65 along with DOT, Cheetah, Cotton, Sprite, Elstar, Firefly, Saphire etc.

Old country saying "he/she knows the cost of everything but the value of nothing" riding a bike you have built adds another dimension to your trials riding, also a classic bike does not depreciate in value as would a new similar cost modern one so the expense is not all one way.

Big bikes seem to do most of the P65 winning though, it is yonks since Wrighty won with his BSA Bantam and a while since a Villiers engined bike took the win. David Coughlan is a real enthusiast and a great rider to watch on Pipeline usuallly on his Ariel.

The first Greeves bikes had rubber in torsion suspension at both front & rear, later models switched to conventional Girling units at the rear with rubber in torsion for the suspension on the front forks with Girling damper units without a spring to damp the fork action. The banana forks had no rubber suspension as both springing & damping was handled by a pair of conventional shocks. I think these may have been introduced in 64 or 65 but before my time in trials so canot be certain. What bike does Charles Coutard ride.

Great stuff, is the bike a rounded tank type or did all 10s have that tank.

Are they popular in the classic events held in Spain, do any of the Spanish competitors ride 4 speed Bultacos who also ride in Scotland.

My thoughts too, strangely though you cannot ride a Greeves with banana type forks in the same event.

I would have to agree with your choice, no chance now of doing that. I reckon it was the 1970's and 1980's for me - the halcyon days when you could enter a World Round, if you were a good Centre rider without a minder, to catch you

Now that the 4 speed Bultaco is approved for the Pre 65 Scottish has anyone entered one.

We all knew that we were talking about having the SECTIONS set to the same severity as they had been BEFORE 1965 - we merely chose 1965 as the cut off point because that was the first year that NO British manufacturers included any pre-unit trials models in their catalogue.......and it was the year that Sammy appeared on his Bultaco Sherpa - 'the bike that could walk on water' - and made most of the classic sections look like main roads............... Hi Deryk, Was Sammy Miller so far ahead of the rest because of the bike or was he using his riding ability to the full spurred on by the new challenge.

Have you bought the 77 Bondy?

Gold rims were fitted to the Verde model tha black frame had alloy ones. I have measured the forks on my TR77 they are 32" with on mybike 2" through the yokes, a pair of earlier MAR forks are around 29.5". The 77 has Betor yokes which are parallel and narrower than those on the MAR which have run out. The MAR top yoke is stepped by a small amount but this pushes the forks down which is the same as having slightly longer fork legs.

Hi rocker1 welcome to TC, I notice that you are located not far from Marlimar which is the place for OSSA advise and parts. The shock mount bolts are m7 fine which are a non iso size, readily available but you may have to send away for them. Do a search here on Trials Central there is lots of info on OSSA all models.

My TR77 came with a Motoplat electronic ignition which needed repair so got replaced with the new system. Ride height is little changed from the MAR which had the upper shock mount at the point where the two frame tubes meet with the lower mounting forward of the rear wheel slot, the 77 has the lower point much further to the rear and the upper mount opposite the top side cover screw so overall there is little difference other than a change to the operating angle of the shock, it is worth remembering that the 77 was forerunner to the Gripper which had angled shocks mounted on raised brackets to bring the shocks within the frame. The forks which I think are about 31" if set with an 1" or more through the top yoke are again then not too different from the earlier bikes whose fork length was +29"? or more from spindle centre to top of leg. The TR77 came at a time when suspension developement was taking place in all forms of off road sport,the Comerford Bultaco ridden by Vesty being just one and similar design changes taking place at Montesa, they were all looking to improve the rear suspension so the 77 has to be taken in the context of its time, they are a good bike with strong back up from Marlimar.

The 77 has a Motoplat electronic ignition ftted when new but if that needs repair Steve at Marlimar supplies a digital ignition that is easy to fit and works superbly well. I have one on my bike which along with a Motocarb 26mm Mikuni makes for a good performance.

Hi Bondy, The black framed OSSA TR77 is essentially the same bike as the all green Verde model which was the last version. The clutch if fitted with new plates from Steve at Marlimar will operate very well with a good feel and light action, suspension (both ends) works very well on my own TR77 Verde, the footrests in my opinion are better lowered. Overall I would rate the TR77 as equal to a Bultaco.