collyolly

I have the same bike, not used for a couple of years now but at the time I could not get it to start easily, in the end I changed the head and insert for the low compression version and the engine was transformed. I think the standard GP is probably set up for ‘modern’ expectations when in reality you just want an easy bike to ride, just my thoughts.

Beautiful looking bike. Asking on here about classic trials bikes is going to be opening a can of worms. Lots will say make it ride like a modern bike and a few will go for originality, you have to ask yourself ‘Where am I going to ride it ?’ Not sure about the Trials scene in NZ but in the U.K. you would be hard pushed to ride that ‘Original’ bike many times a year unless you were up for a serious struggle and we have a vast amount of events throughout the year. Good luck

In the U.K. I think you will find cleaning of your bike at the event is not allowed ( other than removing large lumps of mud in the woods ! ) It’s all about protecting the ground from greases, fuels, detergents etc as once one competitor starts doing it everyone will turn up with cleaning gear and the once nice field then becomes spoilt and the sheep and cows don’t like it.

Someone is pulling your leg ! Thats a polite Brit expression ! , go down to wherever your bike is and discuss face to face, its a trials bike not some piece of exotica, just get it fixed. good luck

Should be Red, also looks like the rear silencer has been removed or lost so expect a lot of noise !

You can also use the decompressor as a brake going down hill, give it a try, probably not used for starting on a 200 as they are not exactly hard to kick over.

Hello again Blockage in the carb means that one of the small airways could be obstructed, if it was, the pilot system would not be working correctly so the bike starts on choke but then will not run when the choke is turned off. Try the compression test again after you have put a few cc’s of oil down the plug hole, this may seal up the piston clearance and give a higher compression result. If it does then you should investigate for ring and piston wear although I note you have replaced the piston and cylinder ! Good luck

I assume you are running with an airbox fitted, is that just the adaptor fitted to the rear of the carb ? If it starts and runs when cold then the ignition must all be in place I would suspect a blockage in the carb.

What did you use to stop petrol attacking the finished result ? I used rattle can lacquer from Halfords and it did not resist a minor spillage, very disappointing. You would think that paint from a car accessory business would be paint resistant.

The steering was a major problem to me, after coming off GasGas TXT I got a bargain priced Sherco but only kept it for 6 months and moved it on, as I could not trick ride and could not get it around the sections that the GasGas could easily steer round.

Whinging and moaning, can’t see that in my post, once again apologies for any offence caused.

Trialsrfun, I see you have removed your blanket comment about pre unit riders, not that fair was it ? I can only apologise if I have upset anyone with my earlier posting, it is just my understanding that certain mods are ‘accepted’ and some are not. Obviously as a predominantly U.K. supported web site ( or perhaps I am wrong about that as well - sorry) I am talking about trials here not in France, it was just a comment meant in a purely advisory manor to anyone taking an interest in this modification I had a set of Bultaco 1964 triples fitted on my bike and changed to period British parts just to keep in the spirit of the game. Yes I have an Amal fitted but that was an accepted part long before I started riding one of these bikes.

Not wanting to ruin anyone’s day but if you are riding in any form of competition then these carbs are not allowed on pre65 class bikes. ( I think, strangely that Tiger Cubs may have been given their own loophole on this but I don’t understand why ! )

You could fit higher bars

The highlighted part looks like a brake light switch.

As said above, this subject has ‘run out of puff’, any form of mechanical regulation as per the wooden block suggested above will only further reduce the entry and in fact only affect the lesser rider. You get your eyes opened to the ability of the top riders when you see 90 degree air turns on a pre unit AJAY / Ariel, a bit of wood won’t stop them it will just make sections harder for everyone else!

The biggest problem I see is how many times a year do you want to ride your classic bike ? If you are happy to just go to one or two special events a year then great keep your original ‘ pre 65 ‘bike in standard trim, but if you want regular outings you either have to accept that you won’t find sections and similar bikes to ride against as they are simply not there any more. You have to realise the pre 65 movement was started 45 years ago, the sport has moved on, most of those original bikes and competitors are no longer out there and organisers have enough on their plates without yet another class. When I got my bike near on 20 years ago there was a healthy classic class down here in the south east so much so that we had separate classes for pre unit , unit , two stroke , and rigid bikes , now we have to lump them all in with the occasional twin shock just to get a handful to call a class for competition ! I decided that I wanted to ride regularly so my bike is competitive on the route the novices ride, there is no way I could ride the intermediate route as whatever you do to one of these bikes it still weighs at least 50% and in the case of my pre-unit 100% more than a modern bike, they go uphill very well it’s the coming down that’s the problem.

Depends on the shape but in the ‘old days’ we would cut the silencer open, repack and then rivet a slightly larger plate over the opening or get someone to weld it shut. For £600 you have to think laterally or get a man who can !

My apologies, you are correct, I got my conversion turned around, I still think it’s too tight though. I have a feeling that 0.001” per inch of cylinder bore has been a guide.

Not wanting to split hairs but 0.030mm is in fact 0.75 thou inch so I would say much too tight.

I would be very surprised if it crushed down from 1mm to 0.5mm, is the whole gasket in contact or is there some left outside the joint you could measure. Also it is an Italian bike, made in Italy, in Europe, so why would they use ‘thou’ on their gasket material unless of course they got some cheap ‘new old stock’ made by ‘Klingers’ back in the 1970’s ?

Well there are two points to consider, first is the chain to sprocket intersection, over here in the U.K. it’s mandatory to have the lower chain run entry point covered. This is usually done by the manufacturers with a simple plastic ‘ sharks fin’ just look at how most bikes are covered. The second concern which really caught my attention was the size of the cut outs in the sprocket, as they go past the swingarm it’s possibly creating a guillotine action. Simply cover this sprocket face with a suitable thick plastic disc as per F.I.M. sprockets. Whatever type of bike, if the throttle twist grip is buried in the ground as youngster falls off that wheel will keep turning and it’s not just the rider that’s in danger its mums and dads rushing to help. I was running a trial a couple of years ago and a youngster turned up with an electric bike with the chain guards removed, I said to dad ‘ I am sorry he can’t have a ride today’ dads response was ‘everyone takes them off, what’s the problem ?‘ I explained the reasons, also that I would be held personally responsible if his lad injured himself. One unhappy lad but next time out the guards were back on.

Looks very nice, don’t want to be too negative but I would do something about keeping the lads fingers / hand out of that rear sprocket, everyone falls off and there’s little control where a flailing digit ends up when you don’t see the danger.

I should have said ‘Our Girls’ as well ! Well done Emma Bristow another fabulous result

Thanks, difficult to maintain interest at the moment but it’s nice to see how it’s going for our boys.