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Yosh |
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Yosh Two Stroke Sniffer
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Yosh |
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Yosh Two Stroke Sniffer
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Teflon-Mike |
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Teflon-Mike tl;dr
Joined: 01 Jun 2010 Karma :
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Posted: 00:49 - 04 Jan 2014 Post subject: |
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How old is it?
Is it carbed or Fuel Injected?
How many miles has it done?
When was it last properly serviced?
Sort of symptom you describe, of gradual power loss then stalling; to me doesn't suggest fuel starvation.
Pipe blockage; bike wouldn't start.
If it was partial blockage, choking flow to carb; then it would only effect the thing at full throttle or under more load, and it wouldn't just 'die' or cut out, it would 'hesitate' as it ran short of fuel; then as that 'flutter' slowed you, and let the float-bowl fill up at whatever rate fuel could flow, pick back up again.
If very bad, might start and idle, but 'bog' and refuse to take load when you tried to rev it or put it under load.
If its Fuel injected; then could be a problem with the throttle position sensor; believe they are simple carbon track jobbies that do do strange things when they start to get dirty and or break down... but not sure how well that matches your symptom.
What you describe; to me; sounds more like gross lack of maintenance and or inordinate wear, and the engine 'over heating'.
If the tappets haven't been adjusted for like, ever; then possible that bike will start and run fine from cold, but under load, as engine gets hot, clearances close up, holding valve off the valve seat, stopping the cylinder sealing properly, giving low compression; which would give gradual loss of power until the engine cut out. Leaving it to cool? Clearances open back up as metal contracts; you get compression back, and bike will run again, until hot and clearances close back up.
Likewise cylinder and piston rings; usually aluminium piston expands more than steel cylinder so clearance between the piston and cylinder get smaller as engine gets hotter; but you get a similar symptom; gap between piston and cylinder gets smaller, piston rubs on cylinder, making more heat; and the engine is actually 'siezing' very slightly; its like putting the brakes on, but not locking the wheel; the force between cylinder and piston is just high enough that it 'brakes' the piston, without stopping it dead; which is what you feel as loss of power, like dragging a brake; until it stalls; then when cool, clearance opens up, taking the brake off, letting engine run again, until hot enough to do it again.
Have you got a Haynes Manual for it?
I'd look at the routine maintenance recommendation and work my way down the list, eliminating variables and see if it goes away; if not, could be an over-haul is due, as damage has been done inside the engine.
COULD be something as simple as the spark-plug is old and worn out... but start at the top of the list and work your way down. ____________________ My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?' |
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Yosh |
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Yosh Two Stroke Sniffer
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Yosh |
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Yosh Two Stroke Sniffer
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_Iain_ |
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_Iain_ Banned
Joined: 01 Feb 2012 Karma :
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Yosh |
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Yosh Two Stroke Sniffer
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Posted: 14:06 - 04 Jan 2014 Post subject: |
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Thanks Ian, your thread has already been useful, I've got a few good ideas from it. Painting the exhaust is on my list if I can ever find a way to remove a rusted exhaust to head bolts. |
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Yosh |
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Yosh Two Stroke Sniffer
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Yosh |
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Yosh Two Stroke Sniffer
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Old Thread Alert!
The last post was made 10 years, 108 days ago. Instead of replying here, would creating a new thread be more useful? |
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