Unleaded fuel only?

fireblade · Post by **fireblade** » Thu Dec 28, 2006 3:25 pm

I have an '86 "nifty 50" (They were called that here, but "spree's" where you are. It has about 11000kms on the clock. It's cheap to run, but quite guttless. I noticed by the fuel cap a sticker that says 'unleaed fuel only" What do you supose the reason for that is? In the quest for a bit more power, I run mine soley on leaded race gas. It's a 15 minute drive to the outskirts of town to a garage that sells it. It does go a bit harder on it I have to say.
I have to drive out in my car and fill my big can though. In New Zealand, there is a $10000 fine for using leaded racegas on the street.
Once I bump the compression a bit, I reckon it'll reap even more gains from the good gas.

islandbayy · Post by **islandbayy** » Thu Dec 28, 2006 4:27 pm

It says Unleaded for a reason. Just keep it at that. Not worth ruining a perfectly good bike to gain a slight bit of HP and possiably a few more MPH.

MySpree · Post by **MySpree** » Thu Dec 28, 2006 6:21 pm

your burning up your engines top end, i bet your piston and rings are practically fryed.

fireblade · Post by **fireblade** » Thu Dec 28, 2006 8:17 pm

Nah, it loves it long time!
AVgas (As we call it here) will only hurt an engine if the compression is too low. I haven't done a comp test yet, but i've run three or four tank fulls through it without a problem.
I was planning on doing new rings, and replacing the head with a smaller chambered early one. (If I can find one) I also though I'd cut the side out of the muffler, and remove all the baffling. Then maybe carry out the pulley mod. I have to do something with it, it's soooo goddam slow as it is.

vonchuk · Post by **vonchuk** » Thu Dec 28, 2006 11:32 pm

Remember in the old days when we ran leaded gas in our cars, we had to change oil every 1000 to 1500 mile, change sparkplugs every 10,000 miles, and rebuild the engines at 100,000 miles. Now with unleaded, we change oil every 3000 to 6000 miles, Sparkplugs last 80 to 100 thousand miles, and engines last 2 to 3 hundred thousand miles. chuck

fireblade · Post by **fireblade** » Fri Dec 29, 2006 4:33 am

I remember when lead was fazed out of fuel here in NZ. (1/1/96) Cars (Old big engined stuff) went from being great runners, to being detonation happy turds OVERNIGHT!
We are now fortunate enough to be able buy 98 RON at the pump, but for nearly ten years we were stuck with rubbish. My first supercharged engine died a death of 1000 screams due to rubbish fuel. The engine I built to replace it is fine on the high octane stuff.
SOME is good,
MORE is beter.
and TOO MUCH is JUST ENOUGH!
As soon as I get a new speedo cable made, I'll be able to gauge what increases in performance I'm gaining from the mods I have planned.