Author Topic: Fuel for M91 vertical engine  (Read 121 times)

Hurric123

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Fuel for M91 vertical engine
« on: September 05, 2019, 01:16:26 am »
Hi all, my engine hasn't arrived in UK yet. I think it may take 20 days in all so maybe another 2 weeks?.
Reading all the experience on this forum I have already ordered spare O-rings and a pulley, but I am not sure what fuel to use. Will UK 97 octane unleaded mixed with 5% 2 stroke oil work. I realise the fuel make up from country to country and seasons will vary.or do ineed to use something like Ronson fuel. I certainly don't want to condemn my new engine if I have trouble keeping it going for the want of different fuel.
Thanks Brian

Raphael

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Re: Fuel for M91 vertical engine
« Reply #1 on: September 05, 2019, 02:25:07 am »
Bonjour Brian,
Jin recommends 97 octane gas and does not mention oil. Personnally, I have used gasoline lighter (very expensive) with 2% of 2 stroke oil, which means just a drop considering the size of the tank (see behind the engine);
https://www.youtube.com/watch?v=94I3FNjDup4
Raphaël
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Dr.Rev.DelmarMacReady

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Re: Fuel for M91 vertical engine
« Reply #2 on: September 05, 2019, 03:28:38 pm »
I have used almost anything in the M90 so far with no problems- gasoline, white gas(camp stove fuel), lighter fluid...It seemed happy no matter what. I've mixed the fuel with castor oil, synthetic 2 stroke racing oil, and Marvel Mystery oil. I like the mixed 2 stroke oil best so far but I am a far cry from making any comprehensive studies. I've settled on the camp stove fuel for the time being mainly because I bought a gallon and it doesn't sour like ethanol. But, having read Gil's post concerning a product here(branded TruFuel I think) that is non-ethanol pre-mixed fuel and synthetic 2 stroke oil at a ratio of 50:1, I might switch after I run out. I already keep TruFuel on hand for my chainsaw and string trimmer.
Bennydaheeb

Hurric123

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Re: Fuel for M91 vertical engine
« Reply #3 on: September 05, 2019, 11:27:40 pm »
Hi as I mentioned my M91 has not arrived yet so I don't know if it comes with any running instructions.
I am now a little unsure of how the engine is lubricated. I assume there is no sump with oil to splash about the insides. Is it intended that you just use an oil can here and there from the outside or are there holes to get oil into the piston bore ?. Obviously vale gear is external.
Regards Brian

Dr.Rev.DelmarMacReady

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Re: Fuel for M91 vertical engine
« Reply #4 on: September 06, 2019, 07:35:40 am »
Well, Hurric...in my case I put a liberal dollop of oil in the crankcase, with the assumption it will splash/sling a good bit. Top end oiling is by premix fuel/oil, and another liberal dollop on the skirt area of the piston. It seems to work for me so far, but perhaps some of the other fellas might have a better proposition. I think Gil had even contemplated removing some of the CC material to open air for manual oiling...

The engine will come with abbreviated instructions, with, as Raphaël said,  no mention of oiling.
Bennydaheeb

txlabman

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Re: Fuel for M91 vertical engine
« Reply #5 on: September 07, 2019, 12:16:02 pm »
Thanks Benny. I ran mine or the first time today. I just used zippo lighter fluid. I haven’t got it to run for an extended period of time yet. I really haven’t figure out the needle valve adjustment yet. Any tips would be appreciated.

Dr.Rev.DelmarMacReady

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Re: Fuel for M91 vertical engine
« Reply #6 on: September 07, 2019, 02:22:28 pm »
Mine, once running, is complacent at about 5/8 turn out from lightly seated.
Bennydaheeb

txlabman

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Re: Fuel for M91 vertical engine
« Reply #7 on: September 07, 2019, 04:26:32 pm »
Mine, once running, is complacent at about 5/8 turn out from lightly seated.

Thanks Benny. I added a small piece of tubing to the valve, marked it with a Sharpie and Shazam. Worked great and ran out a full tank of gas (followed by a few more tank fulls). 🤠

I also added a few drops of two cycle oil to each tank full.

Dr.Rev.DelmarMacReady

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Re: Fuel for M91 vertical engine
« Reply #8 on: September 07, 2019, 06:09:47 pm »
Good point, Charlie. Taking my cues from Gil, I also slipped a short bit of tubing over the mixture screw, taking care to mark lightly seated for reference.
Bennydaheeb

 

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