Hi Neil and fellow sufferers
Settings which seem to be working on my 650SS:
Standard Lucas K2F mag. Points .012"
Timing 28 deg BTDC
Brisk L15C spark plugs, .014"
Hope that helps someone
Tim
Carb Settings 650SS continued
Hi Neil and fellow sufferers
Apology for delay with rest of 650SS settings:
Single Amal 930 MK1 Carb'
30mm inlet tracts
Pilot Air Screw 1 1/2 turns out
(Stay-Up) Float level: 5.0mm below float bowl gasket face
Gauze Air Filter 90623 (wash in petrol and dry before refitting)
Main Jet: 240, Pilot Jet: 25, Needle Jet: 106, Needle Position: 2, Throttle Valve (Slide): 3 1/2
With parts prices rocketing (like everything else!) these settings may provide a useful starting point
(Of course will need to be changed [made richer] to run without air filter)
Tim
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650ss
Hi Tim,
Nice to see your bike in R/H. I should have been there as 'pocky' is only down the 1079.
Thanks for the update in the interest of similarity.
Mine has no filter, so yes, richer. but as per Mercury. Did John Hudson note any plug bother?
I might save you a few bob on plugs yet. Nice bike all the same.
BTW, 2-1 Exhaust for me & Castrol Straight 40. Boyer as you know.
930 set up (Mercury) from Fecked. No complaints.
All the best,
Neil.
Will be @ Rufforth Am...God Willing.
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Mercury Mutterings
The official Mercury sales brochure details an Amal 930 carb using a 280 main jet. The picture shows no filter. On my 650 Manxman, I run the same carb but use a 250 main jet with a K&N filter. The plug colour is perfect.
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28 BTDC seems very safe…
28 BTDC seems very safe sided. Book number is 32. Book for 88SS is 31, and that works fine for my bike. Usually with E5 fuel.
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Carb and Timing Settings 650SS continued
Hi Phil, Neil and David
That's a great brochure.
Wonder if someone with original colour 1960's sales brochures could
run some colour photocopies off for us to buy? Including postage.
Yes I see what you mean about the timing at 28 deg BTDC.
My 650SS has a decompression plate under the barells and yet still accelerates well on "tall" gearing and low-octane modern petrol, two - up.
Went back through my notes from 6 / 7 years ago and found the same difference of opinion from various people at the time: 28 deg to 32 deg. BTDC. I did check the timing on both cylinders.
It's a pain if you have to keep trying different settings.
I guess if it starts well ( 1 to 3 kicks after ? months off-road), ticks over strongly and doesn't
overheat, it must be somewhere near right. And 60 mpg seams respectable.
Tim
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Hi Tim,
All settings on mine are by the book.
Even had the head off because it sounded like a bag of nails (Run in and OK now...oil changes X2 etc, without further attention. No spin off filter.
The difference is that I use a Boyer electronic mag replacement,,,,Untouched.
Hope this helps,
Neil.