OzVMX Forum

Clubroom => General Discussion => Topic started by: rm nut on April 20, 2010, 12:36:27 pm

Title: fuel add
Post by: rm nut on April 20, 2010, 12:36:27 pm

can some one help do you use fuel additive in your fuel i have a 84 rm125 do i need to use fuel additive with unleaded fuel thanks gazza thats a lead additive

Title: Re: fuel add
Post by: Nathan S on April 20, 2010, 04:44:50 pm

No.
The reason for lead additives is to avoid valve seat recession in (some) 4-strokes.
Obviously this is not an issue for a 2-stroke like an RM125.

The other reason lead was good, was because it increased the octane rating of the fuel. Modern Premium fuels have an octane rating at least as high as Super did, so that's a non-issue.

Title: Re: fuel add
Post by: rm nut on April 20, 2010, 04:57:26 pm

thanks rules out one more thought on why i cant get her to run right got the stator back today full rewire and rewind still want go into band just coffs it will go in downhill if i keep on it thanks gazza

Title: Re: fuel add
Post by: lukeb1961 on April 20, 2010, 06:07:14 pm

don't forget to avoid ANY of the new fuel with ethanol in it.. eats your seals faster than Suzuki can empty their old stock..

Title: Re: fuel add
Post by: Lozza on April 21, 2010, 01:03:06 pm

Quote from: lukeb1961 on April 20, 2010, 06:07:14 pm

don't forget to avoid ANY of the new fuel with ethanol in it.. eats your seals faster than Suzuki can empty their old stock..

been using e85 for  some time now and have found no issues with seals. PM sent gazza

Title: Re: fuel add
Post by: lukeb1961 on April 21, 2010, 04:20:55 pm

Then perhaps you haven't been using ancient Suzuki seals, Lawrence. I have seen this three times now. Eats away at the old seals. No, not imaginary. It happens.

Title: Re: fuel add
Post by: micks on April 21, 2010, 04:31:26 pm

lozza what percent did you go up in jetting? e.g 30%

Title: Re: fuel add
Post by: Lozza on April 21, 2010, 05:53:45 pm

Quote from: micks on April 21, 2010, 04:31:26 pm

lozza what percent did you go up in jetting? e.g 30%

That's propretry info but as a general rule e85 sits between straight petrol and methanol. With methanol using a factor of 1.5 fuel usage(BSFC) and petrol 1.00

I just google up some info saying blends >15% ethanol have bad effects on nitrile/rubber, but <10% have no adverse effects

LINK (http://bulktransporter.com/mag/transportation_different_tune/)

This one talks about 'solvency' of ethanol

GOOD ARICLE (http://www.allsafe-fuel.org/TechPaper.pdf)