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by jj.palmer
Sun Sep 29, 2019 7:22 pm
Forum: Ariel Talk
Topic: Kh twin rebuild
Replies: 2
Views: 222

Re: Kh twin rebuild

Looking very smart Lee, when you come to fitting the timing chain and sprockets I followed the attached method which I found much easier than the one prescribed.

John P.
by jj.palmer
Sun Sep 29, 2019 7:14 pm
Forum: Four stroke
Topic: Engine revs rising when air lever opened
Replies: 38
Views: 3058

Re: Engine revs rising when air lever opened

If, as suggested, the spindles are hardened, you can check this with a file, then you will require someone with "spark errosion" facilities ie EDM "Electrical Discharge Machining". This process will create a hole through the hardened surface.

John P.
by jj.palmer
Thu Sep 19, 2019 1:44 pm
Forum: Four stroke
Topic: Eye Bolt Huntmaster Gearbox
Replies: 21
Views: 543

Re: Eye Bolt Huntmaster Gearbox

The eye bolt and its adjusting nut act as a "adjustable mechanical stop" (as opposed to a friction stop) similar to the ones that are fitted either side of the rear wheel, all three are essential to ensuring that both drive chains maintain their correct tension. It is therefore important t...
by jj.palmer
Mon Sep 09, 2019 12:46 pm
Forum: A Bad thing happened to my Ariel
Topic: "That hasn't happened before . . ."
Replies: 24
Views: 4601

Re: "That hasn't happened before . . ."

One of the problems with bolts and locking nuts in this type of situation is that when the lock nut is tightened it may cancel out the tightening affects of the bolt. The lock nut is applying an opposing force to that of the bolt and may change the thread seating faces, therefore has the bolt stretc...
by jj.palmer
Sat Aug 31, 2019 12:15 pm
Forum: Main Chat Forum
Topic: Ariel twin
Replies: 69
Views: 9888

Re: Ariel twin

Paul, The weight of the original sized piston assembly ie piston, rings and pin, was - Near side 240.9 grams Off side 243.1 grams Average 242 grams Estimated original weight = 242 grams + 3 grams (wear loss) = 245 grams. When statically balanced with the above piston assemblies the crank assembly sh...
by jj.palmer
Sat Aug 31, 2019 10:17 am
Forum: Main Chat Forum
Topic: Ariel twin
Replies: 69
Views: 9888

Re: Ariel twin

Lee a word of caution from my past mistake, be wary of the weight of new piston assemblies in comparison to the old ones in order to maintain the original balance factor. The Gandini 6.8:1 comp. ratio piston assemblies that I purchased were 55 grams heavier than the old ones and therefore had to be ...
by jj.palmer
Fri Aug 30, 2019 7:52 pm
Forum: Main Chat Forum
Topic: Ariel twin
Replies: 69
Views: 9888

Re: Ariel twin

Hi Lee, good to see you are progressing, please keep us informed. I thought that new larger diameter pistons are normally compensated to retain the same compression ratio. When I rebored my KH to +.040 the height of the new piston from the gudgeon pin to the top of the piston was reduced by .025 whe...
by jj.palmer
Wed Aug 07, 2019 10:15 am
Forum: Main Chat Forum
Topic: Another tough day at the office !
Replies: 14
Views: 2227

Re: Another tough day at the office !

The performance of the bike is fine although I now only dawdle around country lanes etc. at no more than say 45/50 mph.
It also maybe that because it is not too a finer mesh and not closeup to the bellmouth that there is sufficient variance
between theory and practice.

John P.
by jj.palmer
Mon Aug 05, 2019 10:17 am
Forum: Main Chat Forum
Topic: Another tough day at the office !
Replies: 14
Views: 2227

Re: Another tough day at the office !

The mesh used is 30 gauge which has an aperture size of 0.567 mm (.022 inch) so it will only filter out anything that is larger, therefore, it will not filter out dust particles as described. To use a finer mesh ie a smaller aperture size, it would require the filter to be much larger in size in ord...
by jj.palmer
Sun Aug 04, 2019 8:24 pm
Forum: Main Chat Forum
Topic: Another tough day at the office !
Replies: 14
Views: 2227

Re: Another tough day at the office !

On the KH with the bell mouth removed there is approx. 32 mm clearance between the carb. and the oil tank just enough to a make one to fit, your experience has now prompted me to wire it on.

John P.

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