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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="Colin" data-source="post: 61537" data-attributes="member: 1953"><p>My (Egli) Comet which I have now owned for about 35 years, would (about 35 years ago) happily do about 85 plus MPH, and went better the more it was thrashed (despite some noisy rattley bits- which are easily sorted out simply by getting better ear plugs!) As time passed it didn't seem to go quite so well, so I would fiddle with the carb, fitted bigger main jet etc etc. About 2years ago I found it really was beginning to struggle to get to 70, and maintain that speed. So I did a bit more fiddling-not much better. Then, whilst looking roun at Stafford Show I had a word with Messrs Amal, and to cut a long story short I ordered a brand new Mk One Concentric to exactly the same spec as the original bike builder had put on the bike, some 40years earlier! I did remark to myself at the time that the original spec.main jet was 170 and I had now got up to about 210, POW The bike is transformed, I can wang it up to 70 plus in 3rd bang into top and the old 85mph is back. I would add the bike has Mk one -and -a -half cams (a Ron Kemp speciality some years ago) and when my original Burgess straight through silencer finally had to be cut off it was replaced by an Armours straight through job (which is very well made and not restrictive) I use a 49 tooth rear sprocket (fitted by original builder) and the engine is as noisy rattley as ever, runs on 20/50 oil (though years ago I always used mono 40 sae in summer, or even mono 50 sae when touring in hot countries, and mono 30 sae in winter)Also years ago when hot and on the over run it would smoke like The Royal Scot, running uphill .So what,a quick plug chop would see us off again. Mac Reid solved it for me in the end by fitting oil seals on the valves. The little Egli engine is very noisy (it is entitled to be as it is a 1950 job which spent some of its life as Pete Gerrish's sidecar TT power plant!) but it does GO! So the moral of this taleis twofold 1) If you are worried by clatter/rattle etc, get better ear plugs and 2) If it ain't broke don't mend it!</p></blockquote><p></p>
[QUOTE="Colin, post: 61537, member: 1953"] My (Egli) Comet which I have now owned for about 35 years, would (about 35 years ago) happily do about 85 plus MPH, and went better the more it was thrashed (despite some noisy rattley bits- which are easily sorted out simply by getting better ear plugs!) As time passed it didn't seem to go quite so well, so I would fiddle with the carb, fitted bigger main jet etc etc. About 2years ago I found it really was beginning to struggle to get to 70, and maintain that speed. So I did a bit more fiddling-not much better. Then, whilst looking roun at Stafford Show I had a word with Messrs Amal, and to cut a long story short I ordered a brand new Mk One Concentric to exactly the same spec as the original bike builder had put on the bike, some 40years earlier! I did remark to myself at the time that the original spec.main jet was 170 and I had now got up to about 210, POW The bike is transformed, I can wang it up to 70 plus in 3rd bang into top and the old 85mph is back. I would add the bike has Mk one -and -a -half cams (a Ron Kemp speciality some years ago) and when my original Burgess straight through silencer finally had to be cut off it was replaced by an Armours straight through job (which is very well made and not restrictive) I use a 49 tooth rear sprocket (fitted by original builder) and the engine is as noisy rattley as ever, runs on 20/50 oil (though years ago I always used mono 40 sae in summer, or even mono 50 sae when touring in hot countries, and mono 30 sae in winter)Also years ago when hot and on the over run it would smoke like The Royal Scot, running uphill .So what,a quick plug chop would see us off again. Mac Reid solved it for me in the end by fitting oil seals on the valves. The little Egli engine is very noisy (it is entitled to be as it is a 1950 job which spent some of its life as Pete Gerrish's sidecar TT power plant!) but it does GO! So the moral of this taleis twofold 1) If you are worried by clatter/rattle etc, get better ear plugs and 2) If it ain't broke don't mend it! [/QUOTE]
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