On a 72 R60 - it seems a bit rattley and smokey on start up but appears quiet and smoke free when warm (bike has about 30000 miles)...
Any thoughts on startup and how to cure?
Any ideas?
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Any diagnosis?
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schrader7032
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Smoke: Type of oil? Do you
Smoke: Type of oil? Do you park on the side stand? Is the smoke from both mufflers or just one?
Lower quality oils can burn off their additive package quicker than others. Parking on the side stand lets oil drain down the left cylinder and seep past the rings, especially if the rings gaps have come to align along the bottom. If this is happening, try putting the bike on the centerstand or holding the bike upright or slightly to the right for 15-30 seconds after the engine is off before you park it.
Rattles: Where is the noise coming from? Are the valves set to their proper clearances? Does the sound change if you pull the hand clutch lever in to disengage the clutch? Have you balanced your carbs? Does the timing light show a single timing mark at idle or do you see a ghost image?
The old mechanics used to balance the carbs by finding the condition where the tranny rattles the least. This is an indication that the separate power pulses are even. An electronic ignition could also help with getting the engine firing to happen at consistent times.
It could be that your timing chain has stretched, but hard to believe in those few miles. This could create some noise...I suppose it could go away once things get warm.
In general, you should be sure that all aspects of the bike are in tip top shape. At only 30K miles, the bike should just be starting the "break in". However, if there's been some past abuse, it could be that the valves and valve guides are letting oil past and the rings could be tired. A compression test or better yet, a leakdown test, could be very informative. Certainly, if you plan to dig deeper into the engine, you need some diagnostic numbers to consider so you know what needs to be fixed.
Lower quality oils can burn off their additive package quicker than others. Parking on the side stand lets oil drain down the left cylinder and seep past the rings, especially if the rings gaps have come to align along the bottom. If this is happening, try putting the bike on the centerstand or holding the bike upright or slightly to the right for 15-30 seconds after the engine is off before you park it.
Rattles: Where is the noise coming from? Are the valves set to their proper clearances? Does the sound change if you pull the hand clutch lever in to disengage the clutch? Have you balanced your carbs? Does the timing light show a single timing mark at idle or do you see a ghost image?
The old mechanics used to balance the carbs by finding the condition where the tranny rattles the least. This is an indication that the separate power pulses are even. An electronic ignition could also help with getting the engine firing to happen at consistent times.
It could be that your timing chain has stretched, but hard to believe in those few miles. This could create some noise...I suppose it could go away once things get warm.
In general, you should be sure that all aspects of the bike are in tip top shape. At only 30K miles, the bike should just be starting the "break in". However, if there's been some past abuse, it could be that the valves and valve guides are letting oil past and the rings could be tired. A compression test or better yet, a leakdown test, could be very informative. Certainly, if you plan to dig deeper into the engine, you need some diagnostic numbers to consider so you know what needs to be fixed.
Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.