Do not forget that the barrel type “drippers” on a Scott are not supposed to drip,the oil is sucked in b y the engine & normally do not drip if not turned off the “drippers” are there to meter the oil.Scotts should not smoke in these days of “Ester” synthetic oil such as Fuchs Silkolene “Comp 2” Potty
The main reason for spitting back was written up by Bob Brougham in YOWL Vol 24/6 (Oct 05) page 202,please read it.What happens is that on low compresson engines with a single exhaust port the hot flames from one cyl track into the other cyl and a baffle is needed (see Bobs drawings).I did the mod on one of my engines and it utterly transformed it.
“Rickardo” (yes him of 4 valve fame) wrote about this before W War 1 & said that the exhaust ports of multi cyl 2 strokes must be kept well away from each other.After WW2 Rickardo produced the worlds most powerful aircraft piston engine —-a 2 stroke ! —
but it was too late as we were into the “Jet age” POTTY.
Martin, — the longer one is for a different carburetter,not a type 6 series,probably a type 29 ?. check if the carb has any other wrong parts fitted.The type 6 carb has different primary air holes to a type 276,the air holes must line up with the jet block & the jet block must be stamped 51 on the top in both cases.The throttle valve needs to be a No.3 (a 3 1/2 tiger cub one will probably be OK) Potty.
Your jet seems to be too long,should be a Stnd.jet (no markings),& the lengths should be 24 mm & 42.30 mm .Should be in good condition as 95% of all running is done on the needle jet.These are available from dealers. ——-Potty——
The corrosion is caused by different metals in near contact with each other Galvanic Action it is called, about the worst combination you can get is steel copper & aluminium. = area around the sparking plug ferrules.
see Technicalities 2.4.30 or Yowl Vol 9/12 (July 1976)
Colin,the information you want is in”technicalities” 8.3.06/07 & in “Yowl” 12/5 (Aug 81) & 17/10 (June 92).Good luck ——- “Potty”
As far as I am aware all Scott barrels pre war were polished & lacquer put on,I certainly had two detachable head barrels that I know were original,one well used long stroke one had turned a pale brownish colour.the other a short stroke (yes a short stroke detachable head one )was brand new ex Shipley and was still a lovely colour.
To get the correct finish on your barrel polish it as best you can & apply a mixure of (oil based) artists alizarin crimson. with a good heat resisting varnish,You will need to put about two or three blobs of the red about the size of a pea with about two or three table spoons of varnish,you will probably need a couple of coats–rub down between coats — Potty_
Matthew,can you check with someone who has a similar basket that yours is the correct one ?.Very early baskets were shallower and took one friction & one plain plate less.However I have had the same problem as you when fitting relined friction plates which were a few thou thicker on the friction material & they all add up extra thickness it was very hard to reduce the thickness. Potty
Matthew, 1st we need to know what carb you have,is it an AMAL type 6 or a 3 jet Amal/Binks.If it is type 6 the main jet should not have any part in starting it up (it is normally a 160/170/180 jet) If its a Binks 3 jet we need to know what the jets are & most important what order they are fitted to the carb. “POTTY”
Barry,do not forget Lucas electrics run on smoke!.a battery is for storing smoke, a dynamo will generate smoke.lamps will consume smoke & when a wire brakes smoke will come out & so on —take care & good luck. —-Potty !!!.
Mark, No! do not use Loctite,something is wrong here. if jet block is loose then presumably a standard throttle valve is also loose in the barrel .Get the jet block where it goes in the barrel measured and let us know the result. Glyn.
I have run several 2 speeders on type 26 & 276 carbs using the same settings as Ian Parsons. the original carbs for 1929 & 1930 were Amal/Binks 2 jet. you can with a quick look hardly see the difference between the Type 6 series & the Binks Type.When finding parts for a type 6 series make sure you have got the correct jet block, the 26 has several pilot air holes at the base & the 276 one at the front otherwise the carbs are the same. I have come across 2 cases where owners could not get the bikes to run right & of course the wrong jet block was fitted.
Are we talking about a magneto which in some cases (not all) which can be reversed with a new sat of points cam ring & slip ring,or the mag dyno with angled drive which will pose many new problems.
Fit the Post War type of combined Kick start stop & Bush retainer,you will need to make a slot in the kick start flange.
Fuchs Silkolene “Comp 2” is an Ester synthetic oil & is perfect for Pilgrim Pumps,Drip Feed or Tank Mix and it will not smoke.