Fuel type? - 6-281 International

Hi all,
Time to fill up again, I've been putting 98 or 95 ULP in my C1200 (with a squirt of lead substitue).
Someone mentioned to me that given it's low-comp this is unnecessary and standard 91 is fine.

What's your thoughts?

Merrick,
91 will be fine,
to get the octane up on 98 the fuel companies put additives
low octane can cause pre ignition or pinging on high comp or turbo engines,
as fuel sits in the tank it looses octane over time

if it is a daily driver try a tank of each and see which gives more mileage, that could be the only benefit i can see
JIm

95 is slightly less likely to give vapour lock and percolate in the carby, but there's not much in it. In theory, they should just about run on kerosine!

91 definately burns hotter (my bike used to run-on with it), but won't be a problem in a water-cooled engine.

Jarrod.

the 281 is only 6 or 7:1 compression so 91 is fine - it's what I have been running on Inters since 2003 (with upper cylinder lubricant). My stationary motors run a similar compression ratio and I haven't had a problem with them either

But avoid ethanol blends

I didn't think of ethanol blends as I just avoid them for everything anyway

Well just to throw the cat among the pigeons I dont reckon there is any problem with ethanol fuels I reckon its all a load of bull I use E 10 in everything no crook seals in carbys no crook fuel lines nothing no drama at all
I reckon people get some problem with some old jigger and blame the ethanol because they replace the seal hose gasket what ever and stop using E10 and never have another problem despite the old gasket was no doubt 20 - 30 or maybe 40 years old
E 10 is cheaper to buy runs just as well doesnt matter a bit about the octane been a tad bit lower as these old jiggers are low compression motors anyway

When I was a young fella hooning around we only had problems with motors pinging when the compression was raised to buggery then if you still wanted to get the full effect of the cam we would run it on Avgas for our serious hooning the rest of the time we would just put the dizzy back around closer to were it was meant to be

So my thoughts for what there worth E 10 is fine dont believe the hype

just saying
Paul

Thanks folks.
I'll try 91 next fill and see if there's any difference.

Ran E 85 no problems as Paul said sometimes change is a bit hard to accept

I used to run E10 in everything. Had no problems in daily-driven vehicles. Pinged/ran-on no worse than standard in my bike. My old 360 Cherokee wouldn't run on it, though the Studes don't seem to mind.
Now, things that sit around, however........

Ethanol is hygroscopic, I read. I have two bikes with the carby slides glued solid, one with the pistons glued in as well - E10. Old, tired fuel tap seals? You bet, but it never happened with standard ULP. I also seized my yard blower twice on it.

Now I run 95 in all that stuff. E10 should be OK in water-cooled things that don't sit around unused for weeks at a time.

Jarrod.