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Technical Discussion Forum / Re: 1935 Model 8 Piston rings, advice please.
« Last post by singleminded on September 03, 2019, 08:44:35 PM »
Hi Sean..In my hepolite book there a few 650 twin pistons that look like they could do the job.
50/58 6T is close in 8.5:1..
RE 692 Meteor in 6.5:1
A10 650 in 8.5:1.
these are close and have a 3/4" gudgeon pin..but the decision, as always, lies with the bikes owner..John
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Technical Discussion Forum / Re: 1935 Model 8 Piston rings, advice please.
« Last post by singleminded on September 03, 2019, 08:31:22 PM »
I saw you post earlier in the year Tom and made a note of the details ,,Thank you.
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Technical Discussion Forum / Re: 1935 Model 8 Piston rings, advice please.
« Last post by Tom Snow on September 03, 2019, 03:46:51 PM »
Hi John,

I needed a piston for my 1928 Model 8 earlier this year, the only options I could find were to modify a piston from another make or have a new one made. I chose to have one made and JP in Australia did the job on time (six weeks) and for the quoted price. The piston they made for me included a one piece oil control ring which works fine so far; I have ridden the bike three times and covered 210 miles with no problems. My only advice would be :- 1. Fit the piston according to the manufacturers instruction, ignore all the old wives tales, if your machine shop won't H.T. Howard in Slough will. 2. Use good quality oil like Castrol XXL SAE 40, 3. Run the engine in properly don't thrash it in !!

Good luck,

Tom.     
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Technical Discussion Forum / Re: 1935 Model 8 Piston rings, advice please.
« Last post by wessex_man on September 03, 2019, 02:59:17 PM »
My Hepolite piston sold some time ago. When selling it someone told me they were using triumph ones but I certainly can't confirm that not knowing the crown height wrt to pin and bore etc.
 
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Technical Discussion Forum / Re: 1935 Model 8 Piston rings, advice please.
« Last post by singleminded on August 31, 2019, 05:24:28 PM »
possibly the 48/58 350 bullet, g2 or clipper in 7.25:1 but may need shortening.
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Technical Discussion Forum / Re: 1935 Model 8 Piston rings, advice please.
« Last post by Exstress on August 31, 2019, 10:15:02 AM »
Thanks for the advice John. 
I will do some research into the BSA piston. Someone has also mentioned the Royal Enfield 350cc piston will also be suitable.

Regards, John
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Technical Discussion Forum / Re: 1935 Model 8 Piston rings, advice please.
« Last post by singleminded on August 30, 2019, 11:11:07 PM »
Have you typed '350 piston' into the search box yet?
Try it ..Wessexman had a new piston for sale last year.
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Technical Discussion Forum / Re: 1935 Model 8 Piston rings, advice please.
« Last post by singleminded on August 30, 2019, 11:07:12 PM »
If there is enough meat in the barrel then you might find a slightly bigger but more available piston..
A 1946/1958 B31,, 7.75:1 cr is 71mm, has the same compression height and gudgeon pin but may need to be shortened..There are also some 600/650 twin pistons that may work..My Hepolite book is not very comprehensive I'm afraid.
I have a 9A and pistons are going to be a problem for me in the future..I'm sure one of the Model * owners out there has had the same problem and can give better advice..
Post this to the facebook page as well, the more people that see your question the better..John
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Technical Discussion Forum / Re: 1935 Model 8 Piston rings, advice please.
« Last post by Exstress on August 30, 2019, 04:36:44 PM »
I have popped the head and barrel off and sadly the bike needs a new piston and rings plus a rebore.

I contacted FW Thorntons at Telford but they don't have any pistons suitable for a 350cc.  Please could any member recommend anywhere else I could try?

Thanks in advance. 

John
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Beamers General Discussion Forum / Re: Model 9A in Charterhouse sale 1 June
« Last post by Pete C on August 21, 2019, 08:34:07 PM »
I didn't realise they popped up so often at auctions.

How on earth you keep track of them all I'll never know.
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