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M750 Scrambler Project
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Topic: M750 Scrambler Project (Read 61991 times)
Speeddog
West Valley Flatlander
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RIP Nicky
Re: M750 Scrambler Project
«
Reply #120 on:
October 12, 2018, 10:58:52 AM »
Quote from: koko64 on October 12, 2018, 09:00:54 AM
Anyone know what the stock cranking cylinder pressures would be?
Official service manual for 3ph carbie 750;
Engine warm, throttle wide open, crank til it stops going up.
8 bar minimum, 9-11 bar standard, max difference between cylinders 2 bar.
So 118 psi minimum, 132-162 standard, max difference 30 psi.
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Speeddog
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Re: M750 Scrambler Project
«
Reply #121 on:
October 12, 2018, 05:35:50 PM »
I'd be a bit concerned with a difference of 30 on cranking pressure.
My 750 clatters quite noticeably, but it's run ages making the same racket.
My thumbnail conclusion is they don't run hard enough to hurt themselves as long as basic maintenance standards are kept.
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Howie
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Re: M750 Scrambler Project
«
Reply #122 on:
October 12, 2018, 08:07:15 PM »
Quote from: Speeddog on October 12, 2018, 05:35:50 PM
I'd be a bit concerned with a difference of 30 on cranking pressure.
My 750 clatters quite noticeably, but it's run ages making the same racket.
My thumbnail conclusion is they don't run hard enough to hurt themselves as long as basic maintenance standards are kept.
Mine had piston slap on a cold start. The bike probably has about 100K miles on it. I do remember somebody (speeddog maybe?) said some 750s had forged pistons. The manual does indeed say a 2 bar difference between cylinders. Yeah, I'd be concerned too.
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Speeddog
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Re: M750 Scrambler Project
«
Reply #123 on:
October 12, 2018, 08:33:40 PM »
I've put 45k on top of the original 11k, if that perilously 2nd hand speedo was to be believed.
It's less clattery when it gets hot.
Allegedly forged pistons, IIRC Brad Black had the info.
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ducpainter
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DILLIGAF
Re: M750 Scrambler Project
«
Reply #124 on:
October 13, 2018, 04:48:24 AM »
My injected 750 sounded like it was coming apart. It did eventually.
A lot of the noise is 'fin ring'. Put some hockey pucks back in.
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Speeddog
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Re: M750 Scrambler Project
«
Reply #125 on:
October 13, 2018, 07:25:26 AM »
Quote from: ducpainter on October 13, 2018, 04:48:24 AM
~~~SNIP~~~
A lot of the noise is 'fin ring'. Put some hockey pucks back in.
But they keep falling out.
Should I use new ones?
I wonder how many of us have felt the rear tire twitch running one of those over.
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ducpainter
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DILLIGAF
Re: M750 Scrambler Project
«
Reply #126 on:
October 13, 2018, 08:00:44 AM »
Quote from: Speeddog on October 13, 2018, 07:25:26 AM
But they keep falling out.
Should I use new ones?
I wonder how many of us have felt the rear tire twitch running one of those over.
New ones will stay in longer. The rubber does dry out causing shrinkage and subsequent disappearance.
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"Once you accept that a child on the autistic spectrum experiences the world in
a completely different way than you, you will be open to understand how that
perspective
is even more amazing than yours."
To realize the value of nine months:
Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent.”
koko64
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Re: M750 Scrambler Project
«
Reply #127 on:
October 14, 2018, 05:17:00 PM »
I can happily report that both cylinders are a healthy stock 160+psi allowing regular (cheap) gas. They were within a PSI of each other. Who'd a thought I would be chuffed about stock compression
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2015 Scrambler 800
Howie
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Re: M750 Scrambler Project
«
Reply #128 on:
October 14, 2018, 07:53:14 PM »
Quote from: koko64 on October 14, 2018, 05:17:00 PM
I can happily report that both cylinders are a healthy stock 160+psi allowing regular (cheap) gas. They were within a PSI of each other. Who'd a thought I would be chuffed about stock compression
Nice! If you want a stock flywheel I'm sure someone would want to trade. I would keep the high comps as long as regular gas is not a problem.
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ducpainter
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DILLIGAF
Re: M750 Scrambler Project
«
Reply #129 on:
October 15, 2018, 03:00:26 AM »
Quote from: koko64 on October 14, 2018, 08:45:44 PM
I hope the noise is fin ring as DP said and not a chewed out alloy flywheel spline. The low comp oem pistons are good as I'm planning some rural adventures.
Did you see any flakes on the screen, or in the oil, when you serviced it?
Fin ring tends to diminish with engine temp. It never completely goes away, but it's noticeably worse when cold.
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"Once you accept that a child on the autistic spectrum experiences the world in
a completely different way than you, you will be open to understand how that
perspective
is even more amazing than yours."
To realize the value of nine months:
Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent.”
koko64
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Re: M750 Scrambler Project
«
Reply #130 on:
October 15, 2018, 03:47:14 AM »
Clean as a whistle
.
Cranking comp numbers are quite healthy and consistent. It's also an oil tight and very clean running motor which backs up the view that the later castings, pistons and rings were an improvement.
«
Last Edit: October 15, 2018, 11:12:23 PM by koko64
»
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2015 Scrambler 800
koko64
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Re: M750 Scrambler Project
«
Reply #131 on:
October 18, 2018, 01:12:47 AM »
Picked up some bars with more sweep/pull back to the rider and a half to one inch more height. They were used but like new for 50 bucks off a Ducati Scrambler. I think these bars are common to the Sixty-2 and Full Throttle models. Close to perfect. I gave my Pro Taper bars to my buddy to try out on his Hyper 1100 Evo. An expensive misjudgement on my part, but bars are like that.
«
Last Edit: October 19, 2018, 04:35:20 PM by koko64
»
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2015 Scrambler 800
koko64
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Re: M750 Scrambler Project
«
Reply #132 on:
October 19, 2018, 04:13:46 PM »
What I was expecting behind the alternator
20181013_220618
by
Tony Kokonis
, on Flickr
What was actually in there, (but a polished version). Edit: looks like a Kamna or Yoyodyne version.
images (1)
by
Tony Kokonis
, on Flickr
Hoping it's a machined down stocker or alloy part with a steel centre insert.
«
Last Edit: October 19, 2018, 06:24:49 PM by koko64
»
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2015 Scrambler 800
koko64
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Re: M750 Scrambler Project
«
Reply #133 on:
October 19, 2018, 04:19:36 PM »
20181020_095731
by
Tony Kokonis
, on Flickr
More rise
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2015 Scrambler 800
koko64
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Re: M750 Scrambler Project
«
Reply #134 on:
October 19, 2018, 04:21:16 PM »
20181020_095801
by
Tony Kokonis
, on Flickr
More pull back/sweep
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2015 Scrambler 800
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