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Jeff Jorgensen09/03/2018 09:54:25
12 forum posts

Using 4:1 methanol might be a bit difficult with a 1/4" spark plug as I think it would tend to foul up constantly, so I would stay with a glow plug.

If you modify the fuel mix of 4:1 (stay with the same oil content) and make you methanol content, 90% methanol and 10% nitromethane, it will assist in starting a lower compression engine.

It also has the effect of making the needle adjustment much less sensitive.

Cheers Jorgo

ChrisH09/03/2018 18:34:29
1023 forum posts
30 photos

 

Hi Clive,

I am getting fuel through, don't think it's flooding though but as the plug remains quite dry. The fuel is a standard glow fuel with part synthetic oil and part castor oil lub added.  I have lubricated all the working parts with castor oil and left a bit more in to swirl round the crankcase.  My carby is quite different to yours but your comments on needle position and air shutter are relevant as I have pondered this and mine is all a bit hit and miss. Could be a major factor. Not happy with my carby and may make another.

I calculated what the clearance between top of piston and underside of head should have been from the drawing and then measured this by inserting the end of a bit of lead wire in through the plug hole and then turning the engine over so the lead wire was crushed, and then withdrawing the lead wire and measuring it with a mic.

Sorry to hear of your lack of success with Easy Start - I was hoping for great things from that!!

The piston is of course a sliding fit in the sleeve not the liner, a senior moment error in my previous post - didn't proof read it!

I need divine intervention not luck I think!

Chris

Edited By ChrisH on 09/03/2018 18:37:33

Clive B10/03/2018 10:07:02
46 forum posts
21 photos

Jorgo, Thanks for your suggestion, what type of glowplug could you recommend?

I've posted a short video of the engine running on YouTube, if anyone's interested!

https://www.youtube.com/watch?v=h94vp9cqiHI&feature=youtu.be

Clive

Jeff Jorgensen13/03/2018 13:30:07
12 forum posts

Hi Clive,

Being a 2 stroke, possibly the OS No. 8 would suffice.

When running four stroke on methanol it is necessary to run a four stroke plug.

They are much smaller internally to hold the heat during the exhaust stroke.

Another thing might be worth looking at are the new OS glow plugs developed to run petrol/oil engines.

It is labeled as an OS G5 glow plug and there are many discussions on the internet and video on use in different engines etc on youtube.

Cheers Jorgo

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