Which pistons are available for my ariel

Singles, twins and fours.
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cmfalco
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Re: Which pistons are available for my ariel

Postby cmfalco » Fri Nov 24, 2017 2:22 am

The Canadian who owned the +30 piston sent it to me, refusing payment of any kind, even for the postage. This makes him the first International Sponsor of my Cannonball entry. Anyway, with the piston in hand I confirmed its weight on my calibrated scale and was able to make accurate measurements of its dimensions and thus a more accurate estimate of the weight of a stock piston. This reduced the previous estimate by precisely 2 grams (0.07 oz.). Taking the average of the Australian and Canadian piston weights, the new "official" weight is 505+/-2 grams (17.81+/-0.07 oz.).

This is a very minor correction to the weight given in my previous post and it will make a trivial change to the final balance factor I determine. But, there's no point in having the accuracy and not using it, especially since it will save anyone else from having to go to this trouble in the future.

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Re: Which pistons are available for my ariel

Postby IanR » Sun Dec 03, 2017 6:22 pm

I recently bought a +60 JP piston for my 1954 600 VB. It was well made and at about £120 delivered not unreasonable in price. The piston weighed 710gm, with pin, less rings. The old +30 Hepolite piston weighed 580gms with pin less rings.The original std. piston probably weighed nearer 556gm. How this will affect vibration remains to be felt. Unfortunately it wasn't a runner when I got it. I'm expecting some vibration but hopefully with a low revving side valve nothing unpleasant.

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Leejm
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Re: Which pistons are available for my ariel

Postby Leejm » Mon Dec 04, 2017 9:30 am

Ian that's alot of difference, you will be better of to rebalance to your new piston. I have used 67% in my nh and vha.
1948 NH, BSA D10 SPORTS. 1953 VHA, 1951 KH rigid project.

ralph thetford
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OVERHAUL OF BURMAN BA GEARBOX

Postby ralph thetford » Tue Jan 30, 2018 8:29 pm

I am presently trying to dismantle the BA Gearbox off my 1938 Square-4 I have taken off the front cover with kick start/gear change mechanisms etc. -- but I am struggling the get the nut off that holds on the ratchet and spring on the main box to allow me to remove the mid cover and allow me get to the gears--I have held the sprocket tight at the other end but the nut will not move ---Any Ideas--should I use a nut splitter and replace with a new nut? ----or is there another way?

Regards Ralph

roger.fellows
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Re: Which pistons are available for my ariel

Postby roger.fellows » Tue Jan 30, 2018 9:03 pm

Hi Ralph, try page 10 of the Four stroke section of the forum, very near the top of that page, but for future reference, it's probably better to start a new topic than tag on the end of an unrelated one. As an alternative you could try searching posts by Pete.Silson

All the best, Roger

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Re: Which pistons are available for my ariel

Postby paul.jameson » Tue Jan 30, 2018 9:17 pm

Put the clutch centre back on, complete with nut. Hold the clutch centre with your clutch tool made from old clutch plates and a steel bar and then try the nut. If it doesn't move then, warm it up with a blowlamp and try. These nuts are not usually too tight.
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Re: Which pistons are available for my ariel

Postby nevhunter » Tue Jan 30, 2018 10:23 pm

I have had it where that nut is almost welded onto the thread. What you don't want to do is ruin the thread on the end of the shaft. (K/S end). If in doubt I would drill carefully two holes opposite each other and split it off. The nut is relatively soft, and a small hex. You may have to remove the shaft to clean up the thread, or replace the sprocket. insert a dummy shaft as the other is withdrawn (even of wood) and you can remove and reinstall the mainshaft without dismantling the entire box. Nev

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Re: Which pistons are available for my ariel

Postby Terry Payne » Sat Aug 25, 2018 8:20 am

I have a piston from a Suzuki SP370 trail bike fitted to my VCH, it was a std piston but the cylinder was O/S already but had a machine shop bore to suit with 2thou clearance and if remember it is 83mm bore now. All this work was done in 1990 and I have just put on my 3rd rear tyre and 2nd front and it has not been touched ,now there is something to chew the fat over.


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