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by Simon.Gardiner
Fri Aug 26, 2011 9:15 pm
Forum: Four stroke
Topic: Noise
Replies: 10
Views: 2528

I'm not sure this has eliminated the possibility of transmission which can also be affected by load (retarding ignition = less load?) 'whine' sounds more like bearing/gears or possibly chain/sprocket, 'clanky' could be chain, clutch, broken bearing? Or something loose. Or possibly even the camshaft ...
by Simon.Gardiner
Fri Aug 26, 2011 12:02 am
Forum: Four stroke
Topic: Difference between late KH and FH chaincases
Replies: 4
Views: 1187

PS - casting number on that chaincase inner is also K400
by Simon.Gardiner
Thu Aug 25, 2011 11:50 pm
Forum: Four stroke
Topic: Difference between late KH and FH chaincases
Replies: 4
Views: 1187

Where's my anorak gone..... '56 part nos for chaincase inner, 5711-56(singles), 5712-56(FH), 5713-56(KH) However I have run a bike where the 650 engine was swapped for a 500 single, the chaincase wasn't changed, I cut a spacer from a piece of alloy sheet and used it between the chaincase inner and t...
by Simon.Gardiner
Thu Aug 25, 2011 11:14 pm
Forum: Main Chat Forum
Topic: 1949 ariel 350 twinport
Replies: 14
Views: 4271

That looks like a 6-pint 500 oil tank as well but both very practical even on a 350...
by Simon.Gardiner
Mon Aug 22, 2011 12:21 am
Forum: Four stroke
Topic: NH Barrel Spiggot height
Replies: 4
Views: 1292

I've just pulled out a rather grubby 52-55 type, I wouldn't like to guarantee the spigot height(partly because it's still got the copper gasket well stuck on) but the diameter is about 3.156 - maybe 3 5/32 ? However, I've got a feeling that the later ones also have an extra fin - this one's got 10 f...
by Simon.Gardiner
Sat Aug 20, 2011 11:45 pm
Forum: Four stroke
Topic: NH Barrel Spiggot height
Replies: 4
Views: 1292

From 1952, bigger finning on head and barrel, head gasket and smaller spigot on top of barrel (smaller diameter and slightly lower as well). The 350 kept an iron head until 1956, and in 1955 (I think for the one year only)there was much more pronounced finning in the area above the push rod tubes. (...
by Simon.Gardiner
Thu Aug 18, 2011 8:07 pm
Forum: Main Chat Forum
Topic: Annual Rally 2011
Replies: 7
Views: 2269

Not sure.....but that's an interesting use for a plunger frame :-)
by Simon.Gardiner
Sat Aug 13, 2011 11:05 pm
Forum: Four stroke
Topic: Any other big end suppliers apart from Alpha ?
Replies: 18
Views: 4612

Uncaged bearings don't like revs (the rollers twist and bind against each other). I never got a 350 big-end to last longer than 7000 miles - although that was using motorway speeds. The 500 is overgeared so it might be kinder to uncaged bearings...but I can claim to haver broken a duralumin cage (ve...
by Simon.Gardiner
Fri Aug 12, 2011 11:08 pm
Forum: Four stroke
Topic: Hepolite piston
Replies: 5
Views: 1558

It's a 7.5:1. If the GPM really is 7:1 (according to google) then I wouldn't think it would be any quicker, but it might be smoother if it's lighter. Having said that getting the bottom end set up really well seemed to have a big effect on mine. (How odd, there was a 5045 just like that on ebay not ...
by Simon.Gardiner
Fri Aug 05, 2011 11:44 pm
Forum: Four stroke
Topic: WM3 Rear Rim on 1956 NH
Replies: 5
Views: 2731

Re: WM3 Rear Rim on 1956 NH

According to the Avon web site the 100/90 AM26 (Roadrider) has a min rim width of 2.15 and thats a WM3 (the WM2 is 1.85)
I think I might do some more measuring - I'm about due for a new pair of rims, maybe I'll go fro a WM3 on the back!

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