brucey

Check behind the clutch. Most trials Cubs have been modified to fit a final drive sprocket access plate (similar to T100 twins). This lets you change the final drive sprocket without having to split the crank cases! If it has been modified, the thin plate should have an oil seal fitted (with the spring side of the seal facing the clutch). ATF is fine for the clutch. You only need enough to cover the primary drive chain so I put 100ml in instead of 200ml as stated in the manual. If the clutch slips when kick starting you can fit stronger springs and add an additional plate with billet ally pressure plate if required which available from a number of Trials Cub Specialists.

I’m 63 and have been riding trials bikes since I was 15. I don’t really enjoy the whole competition thing as I am not that talented. However I love tinkering with things. I therefore built a couple of trials Cubs and really enjoy doing the easy route in club and pre65 trials. There are a lot of people like me just out for a good day out without trying to kill yourself! 😊

I usually just buy Fox MTB Gloves from Sports Direct. Cheap and effective 🙂

Tiewrap, I guess there are not too many big climbs in Holland, however I'm not sure about rocks etc. I'm 62 years old and mainly do club level pre 65 trials. I wear pull up mountain bike shin and knee protection (purchased on line) under normal (unpadded) trials trousers. I find this gives adequate protection and is comfortable. I hope this helps.

Petroleum 😊. Super unleaded (97 octain) if possible as it has little or no ethanol. Cubs already have hard valve seats so lead substitute not really necessary but you can use it if you wish 👍

Nicolas, you don’t really need an R Cam for trials as they make the motor have less traction and response from low revs. However I have R cams fitted to both of my trials Cubs because I wanted slightly more power. If you do fit an R cam (if you can find one!) you will need different valve clearances. It is possible to fit a distributor type camshaft into a side points engine if you carry out some modifications Hope this helps Bruce.

Hi Nicolas. Yes you can fit a diaphragm clutch to a Tiger Cub. They include a belt primary drive and are available from Pete Kirby. I have one fitted to my Armac Cub and it is very good. light action and no slip. I also have an upgraded UPB wet clutch on my other Cub which also works well. A standard clutch can be made to work well. It all depends on how deep your pockets are! (How much money you want to spend) I hope this helps 😊

Look on Ebay for the replacement bolt sets. That should tell you the thread size. Failing that, phone Meriden Off Road, UPB or Greystone. I had a 'well used' set of Crank Cases which I tapped the small bolts to M5 and Heli-coiled the larger ones to M8 as most were stripped and I already had metric inserts and bolts bolts in my shed. However, if only a couple are stripped I can understand your desire to keep original. Hope this helps. Bruce.

A photo would help. Buy a second hand assembly from Ebay. They aren't expensive. I extended the length of the arm to make my clutch lighter. Then got really carried away and fitted a clutch lightening kit from UPB which does away with the arm altogether! Hope this helps. Bruce.

I have built and ride several Cubs. I do not use oil seals in any. My advice would be to fit new valves and Phos Bronze Guides if you are concerned about smoking. A good friend (who is no longer with us) did fit some old Ford Valve Seals to one of his Cubs which reduced the smoking effects caused by worn guides but not a cure! Hope this helps.

Is it a blind bush you are replacing? If it is, you may find a reamer will leave a small taper near the end. I usually skim mine very carefully in my lathe using a boring tool. But that advice is only useful if you happen to have access to a lathe I guess! ??

I would make absolutely sure the pilot jet isn’t blocked. Even if it means sticking a small piece of wire through it.

Oiled up/blocked exhaust maybe?

Speak to Bob at UPB Also Chris at Meriden Off Road is a wealth of knowledge if you don't mind travelling to Birmingham ............But lock up your credit card first ? The other option is to do it yourself. These require a couple of cheap special tools and are pretty basic engines depending on your mechanical ability.

I'm an average Club rider and at 60 ride a Tiger Cub and 4RT (both 4 stroke). I have also ridden Gas Gas's in the past. In all honesty, I can get away with more on a Gas Gas as they are lighter but ridden at Club level in non stop trials and trying not to use the clutch (old school), the 4RT is a great bike to ride. My 2014 Repsol has brilliant suspension and build quality. If anything,it's a bit too powerful and makes my 60 year old arms ache after a day's riding, however I'm not that fit! If you are anywhere near Kent, you are welcome to try mine. Technique is key with these bikes and I love mine although I tend to use my Cub on the easy route for club trials these days. You really need to try one around some simple sections and compare it with a 2 stroke to see which you prefer. Hope this helps. Bruce.