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by david.anderson
Sun Jul 05, 2020 10:15 am
Forum: Four stroke
Topic: Angle BTDC - ignition setting
Replies: 9
Views: 504

Re: Angle BTDC - ignition setting

there is a calculator in the members area which includes the rod length. http://www.arielownersmcc.co.uk/members_only/ariel_library/DocumentRepository/Ariel/TechnicalPapers/DegreeCalculator/DegreeCalculator.htm A change in rod length can have a considerable effect. A longer rod results in more dwell...
by david.anderson
Sun Jun 28, 2020 10:06 am
Forum: Four stroke
Topic: Squre Four Engine Breather
Replies: 10
Views: 294

Re: Squre Four Engine Breather

Alan
mine is about 10mm below the bottom of the breather pipe and is connected to it with a short piece of plastic hose and a couple of hose clamps.
No mayonnaise and no blocking of the valve.
David
by david.anderson
Sun Jun 28, 2020 7:54 am
Forum: Four stroke
Topic: Drags alluminium rockerbox gaskets for singles
Replies: 7
Views: 2506

Re: Drags alluminium rockerbox gaskets for singles

Alan My aluminium gaskets from drags probably 2 years ago measure 1.5mm thick and they are a perfect fit ie they overhang the rocker box by about .5mm all around. Possibly there is a new supplier? However I found that I could not get them to seal with gasket cement as advised, so I eventually had to...
by david.anderson
Sun Jun 28, 2020 7:53 am
Forum: Four stroke
Topic: Squre Four Engine Breather
Replies: 10
Views: 294

Re: Squre Four Engine Breather

Richard I have fitted a reed PCV valve to the end of the existing breather pipe on my mk2. I used a short length of flexible hose to connect the pipe to the inlet on the PCV. https://www.mikesxs.net/yamaha-xs650-reed-type-engine-breather-valve-pcv.html With the 4g it is worth considering the AAR roc...
by david.anderson
Thu Jun 25, 2020 1:15 am
Forum: Four stroke
Topic: Squre Four Engine Breather
Replies: 10
Views: 294

Re: Squre Four Engine Breather

Graham Yes the breather direct on the crankcase is in theory more correct, however there is a massive amount of oil thrown about from the bigends. A direct crankcase breather may well expel more oil than air. By putting the breather on the timing chest that problem has been eliminated. A direct cran...
by david.anderson
Fri Jun 19, 2020 12:06 am
Forum: Main Chat Forum
Topic: Front Forks
Replies: 14
Views: 622

Re: Front Forks

Jim
I would not change the fork oil to 20 grade until you fit the dow dampers. the heavier oil will provide better rebound damping until then
regards
David
by david.anderson
Wed Jun 17, 2020 11:58 pm
Forum: Main Chat Forum
Topic: Front Forks
Replies: 14
Views: 622

Re: Front Forks

Simes Yes no problems with the nacelle type top nut. The nut is shorter so I make a bush that I let hang out below the nut and tig to the bottom face of the nut. Again 3/8” thread inside the bush. With this assembly it can be fitted to the top nut and the whole assembly fitted after the top yoke. Th...
by david.anderson
Wed Jun 17, 2020 11:05 pm
Forum: Four stroke
Topic: NGK, Carbon and my W/NG
Replies: 9
Views: 303

Re: NGK, Carbon and my W/NG

Yes NGKs do not like rich running and will give up under such conditions. I had been using projected tip NGKs ie BP7HS however they have now been dropped and replaced with BPR7HS which is a resister plug. No good in the Ariel. However I did switch to champion a while ago and feel the Champion equiva...
by david.anderson
Wed Jun 17, 2020 10:49 pm
Forum: Main Chat Forum
Topic: Front Forks
Replies: 14
Views: 622

Re: Front Forks

Simes The oil passes around the outside of the bush and through the central orifice (then out the four 1/8” orifices) under compression but under rebound the ball bearing closes the central orifice and the passage of oil is only around the outside. To connect to the top nut on the Ariel I make a bus...
by david.anderson
Wed Jun 17, 2020 8:34 am
Forum: Main Chat Forum
Topic: Front Forks
Replies: 14
Views: 622

Re: Front Forks

The forks are only rebound damped, and the initial part of the rebound damping is not effective due to cavitation. However topping out should not happen. Are your forks correctly filled with the oil level being about 17” below the top. The 48 fork leg has two 180 degree opposed orifices near the bot...

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