matey

On post 51 engines, with the wider cam follower toe....the two finger follower is Exhaust & single is Inlet. End float on the Cam & followers......there is not a figure quoted in the "Selly Oak Service Manual". I shimmed my Cam & Followers, so there is minimal float - cold. As soon, as the crankcases get warm, they'll be a bit of expansion & therefore tolerance should be about right ! Cheers

If its been pinking, they'll be tell tale signs on top of the Piston ! If it was my engine, i would be "back to basics", as you have run it for a while with strange noises, : Check the crank for true & run out Check the mains & big end Check the conrod, make sure its straight Check the cam bush is correctly seated in the righthand case Build up the bottom end, make sure the rod is centered in the cases Check the bore & piston tolerances ***Check the piston to head gap ***Squish band 86/87mm & 20degree cut on the head Check the cam timing & ignition timing ***I think the noise is the piston lightly clipping the head when hot & under load, as it was a very similar noise to my HT. The bottom end needs to be good & trued, then at least a 40thou piston/head clearance....50/60thou is not a problem, as the 500 is not short on power ! That'll keep you busy for a couple of days....... Cheers Chris

I doubt its the liner, unless there's a machining problem. The top flange of the liner should be 2-3 thou taller than the barrel itself, effectively its the liner thats torqued tight to the head. If you aren't using valve caps & the valve train all works OK. I would check piston/head contact/clearance......if you take the head off, are there any marks around the edge of the piston, or on the dome in the head ? Check the clearance with plasticine...40thou minimum. I machined the squish band radius from its standard 81.8mm diameter, to a full 87.00mm, otherwise its possible to get "hot spots" on the edge of the dome, if the motor gets very hot. Cheers Chris

Hi Ken, Im by no means an expert on Short Stroke ARIEL motors, there must be others with lots of experience on this forum. But have learnt a lot since mine first ran, last august ( with the help of JC & JG..), I heard yours going up section 18 - Weighbridge on the Cotswold Cup & have had similar noises from mine in the early days. The MD liner (so i understand) is a top hat liner, which should be under compression, between the alloy head and the barrel.....so unlikely to move. I use Loctite 574 flange sealer, on the head/barrel interface (not the liner ring..) I would check the valve caps, as there has been a "soft" batch of caps, that get hammered...mainly the exhaust. Also make sure they are not too long & catching the valve collects, which i made a mistake with. Check the piston head/clearance, think i have 40thou minimum, machine a squish band in the head as required. I have several CNC'd barrel spacers to lower the compression/increase clearance, if you need to try one. I probably have too much oil going to the valve gear & it still weeps a bit on the left side oil feed conversion Im very please with the way my motor runs The rider still needs more work though.....! Cheers Chris

West of England Trial 27th - cancelled.....waterlogged ! Cheers

Hi Gav, if your in Devon on the 27th, come along to the start of the West of England MC Xmas Trial 27th 10.00am-ish Rising Sun pub car park - Woodland, nr Ashburton. Should be a good turn out of twinshocks & p65's Cheers Chris

Bill, many thanks for making contact [the power of the forum page...] I accept the fact that you say that you posted the parcel out on the 26th October, but for some reason the "label" came unstuck from the parcel...... and hence the parcel was returned back to "sender". At least we now know where it is.....back at Trials Cub parts !? As you have paid & posted the parcel, from your business, its your responsibility to chase the courier. Anyway how could i know , which courier/posting method you have used. Look forward to receiving it sometime next week..... Kind Regards Chris

Calling out to Bill Beveridge, is Trials Cub Parts business still operating ? If you know Bill, please pass on this message: Bill, Seven weeks ago you received my Tiger Cub Barrel & promptly cashed my cheque for £150 for a rebore and a o/s Wiseco piston. Despite many calls to both your contact numbers listed on your website, i have not had the barrel back from yourself. If you "have" posted the barrel, please confirm the courier, their contact number and a tracking number. If you cannot provide these details, i presume you have still not posted the item. I am hoping this is just a oversight, if you do not contact me within seven days, i will be taking advice from the small claims court to recover the money i have sent you and the cost of a replacement barrel. I am sorry to have posted this topic, but as you do not hold your promises or return my messages, it leaves me with no other choice. This subject [as initially promised..] could have been dealt with, within a couple of days. Kind Regards, you have all my contact details Chris - Bristol