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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
MK1 carb tuning and BTH noise?
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<blockquote data-quote="Ducdude" data-source="post: 24585" data-attributes="member: 2077"><p>Today I took the 52 shadow on a 50-60mile high speed 60-90+mph hop and I am happy to report that the bikes manors around town and on the highway are indeed improved with the needles all the way up. Smooth idle and good steady acceleration to 60-70mph with no stumbling or missing...</p><p> </p><p>The bike still only tops out at 90-95mph , depending on the wind and seating position, she just runs out of steam. My next step is to go up from the 210 main jets to 220s and see if that gives me a bit more on the top end...I have up to 240 size jets in inventory but I think it may be wise to just take it in steps...Data point- a new compression test shows 149-150psi on the rear cylinder (was the leaking one at head joint now fixed) and 154-156psi on the front...</p><p> </p><p>Comments and recommendations welcomed...</p><p> </p><p> </p><p>Now I have about 400 miles on this bike since I put her together after 40 years of slumber and I have a BTH on her which seems to be doing its job just fine. Today's temp was in 77F/25C and this was the first run in temps this high while really pushing her. After she was good and warm after 50 miles at 70-80mph avg., I exited the motorway I noticed an RPM dependant whine coming from the front of the bike. Not scary sounding and not a warbly whine just a whine that varied it's pitch with RPM.. I had thought primary chain but it is not coming from there and that chain already has a bit of extra play in it from the last time I heard this whine...last fall</p><p> </p><p>So, the question is as I have never had a bike with a mag in it or a Vincent before are they prone to whine a bit when at opperating temp or should I start thinking that the BTH's bearings are starting their death song...</p><p> </p><p>Another possibility is the gear clearances in the timing case could be a bit to snug and once at summer operating temp and the related expansion is supposed to sound...</p><p> </p><p>Thanks for any and all comments and suggestions..</p><p> </p><p>It was a glorious day to own a Vincent!</p><p> </p><p>I hope you all got out and enjoyed it!</p><p> </p><p>Ciao,</p><p>Eric</p></blockquote><p></p>
[QUOTE="Ducdude, post: 24585, member: 2077"] Today I took the 52 shadow on a 50-60mile high speed 60-90+mph hop and I am happy to report that the bikes manors around town and on the highway are indeed improved with the needles all the way up. Smooth idle and good steady acceleration to 60-70mph with no stumbling or missing... The bike still only tops out at 90-95mph , depending on the wind and seating position, she just runs out of steam. My next step is to go up from the 210 main jets to 220s and see if that gives me a bit more on the top end...I have up to 240 size jets in inventory but I think it may be wise to just take it in steps...Data point- a new compression test shows 149-150psi on the rear cylinder (was the leaking one at head joint now fixed) and 154-156psi on the front... Comments and recommendations welcomed... Now I have about 400 miles on this bike since I put her together after 40 years of slumber and I have a BTH on her which seems to be doing its job just fine. Today's temp was in 77F/25C and this was the first run in temps this high while really pushing her. After she was good and warm after 50 miles at 70-80mph avg., I exited the motorway I noticed an RPM dependant whine coming from the front of the bike. Not scary sounding and not a warbly whine just a whine that varied it's pitch with RPM.. I had thought primary chain but it is not coming from there and that chain already has a bit of extra play in it from the last time I heard this whine...last fall So, the question is as I have never had a bike with a mag in it or a Vincent before are they prone to whine a bit when at opperating temp or should I start thinking that the BTH's bearings are starting their death song... Another possibility is the gear clearances in the timing case could be a bit to snug and once at summer operating temp and the related expansion is supposed to sound... Thanks for any and all comments and suggestions.. It was a glorious day to own a Vincent! I hope you all got out and enjoyed it! Ciao, Eric [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
MK1 carb tuning and BTH noise?
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