Pre-65 Bikes

After a year of trying to get my cub to run properly,199cc Dellorto 22mm, (its always felt flat at the bottom and never felt like it would rev out),but after trying different carbs playing with and checking the PVL system i finaly got hold of an 'R' cam to try. On stripping the right side casing down to replace the cam i discoverd the problem, the cam timing was out by 3 teeth! the cam gear was lined up with a scratch mark and not the punch mark. I would presume that in this setting the valves were getting a bit close to the piston and this would explain the poor running(black plug,having to run strange carb settings to get it to run ok'ish) i am an average mechanic and s…

What is the performance difference between a std cam & an R cam when fitted to a 199cc Cub. If the R cam is used do you need to fit stronger valve springs. Also engine, gearbox & rear wheel sprockets, I thought of going with 17t engine, 13t gearbox & 60 or 62 rear wheel on 420 chain, does a wider size chain catch or rub around the gearbox sprocket area. Which is the best Carb to use I am told the Del-Orto 22mm is very good is this correct.

Nearly there with the Cub have had it running but it is not right. It is fitted with the Del-Orto carb but to start it needs the throttle open with the choke on, when the choke is released the engine dies. Can any one tell me have you had to change to any different jet sizes etc in these carbs or alter anything, also what jets, cutaway etc did your carb come with. Thank you in advance for any help.

Hi guys, Please see images of my Cub casings.Just split the engine. The first casing shows an area milled out and a plate inserted with four Allen screws inserted. Is this the mod to allow access to the oil pump. You lads who know there stuff will probably recognise the model of engine but it’s a 1961 year model. The second casing, well, I’ll wait for some ideas, is it to allow the gearbox sprocket to be removed without having to break the motor. It’s a really poor fit. Thanks.

Has anyone had the same problem as me when it comes to fitting a 13T g/box sprocket and a 420 chain, The chain will not sit down on the sprocket as it contacts with the seal and bearing housing.The crankcases are twin roller bearing and the only difference I can see from the old ones that got damaged is that they have two seals on the g/box sprocket while the old ones had only one, This makes the sprocket too close to the bearing housing which would cause the chain to wear away the seal lip. Anyone have any thoughts ?

Can some kind soul give me the dimensions of the springs for a tiger cub clutch. IE overal length, inner and outer diameter. Cheers

Hi All I have just fitted 3 new surflex clutch plates to my cub, with all adjustments correct the final plate fitted is only flush with the housing edge with lever out. With lever pulled in the plate's drive tangs disengage from the housing and the plate slips down. Any help appreciated. triton

Whats the best way to set the spring tension on a cub clutch? 199cc with serco alloy plate fitted. At the moment the clutch is very heavy , how far would you back the springs off before slip occours or is it just trial and error?

I’m covered in oil having had my clutch primary cover off at least 3 times tonight. The problem I have is that everything is fine until I put oil in the case. Then the kickstart doesn’t engage as if the clutch were pulled in. Drain the oil and everything is ok. I’ve adjusted the clutch as per the manual with the springs 3/8” from the face of the plate. Anyone have any advice please as I can’t stomach getting covered in more oil to get the same result. Is there a dry clutch conversion which would save all this and also give some improvements as I’m sure that when I do get this sorted the clutch is more than likely going to slip. Thanks

Can anyone tell me the best compression ratio to run on a Cub?

Which is the best type of crankcase breather for a Trials Cub, some people leave the original with the small hole inside the r/h engine case. Another method blocks this off and then a pipe is fitted from the screw in bung on top of the crankcases, I am told that one can also be fitted on to the head but I have yet to see this type. So which method works the best.

Hi folks, anyone know where I can get the necessary bits to put a Dellorto carb on my cub?? Thanks in anticipation. Cheers, jt

Hi to all the Tiger Cub boys Im hoping that somone can give me some feedback on the stator kit from Elextrexworld, i am just about to start a Cub rebuild and have been looking at stator kits PVL etc, but this one does away with the machining needed to fit the others, has anyone fitted one, and how did it perform, any help or advice would be great Regards Bob

Just spotted this on ebay, I know more or less how much it would cost to build this, but what do you think it will go for ? http://www.ebay.co.u...=item2a1d62af03

What engine oil are you lads using in your trials cubs ie: Classic Semi Synthetic Fully Synthetic Vinnie

I see Cubs with both the usual longish front pipe and silencer between frame tube and shock, or a short pipe with the silencer more over the gearbox area finishing near the rear tyre. Has anyone tried both options does it make any performance difference which is used?

What filter are you using on your amal MK1 622 on Cubs Vinnie

Does anyone know the best trials set up for a tiger cub, i have some 3ta forks but need softer springs......what about twin shocker stauchions? Regards Christy

How do I remove the bottom leg from Cub heavyweight forks, I need to change the seals, do I unscrew the chrome carrier from the leg using c-spanner on one of the 4 serrations or a peg spanner on the inner smaller chromed carrier with 2 holes??? Its a new ( to me) bike and have no manual as yet. Any help appreciated triton

I have Heavyweight Cub Forks and standard cub front wheel, that has an axle that is clamped either side, it is not a very tight or secure system, any sugestions i.e. pull through axle any help Vinnie