Fuel to use for cbr250rr?

[FlyingDutchMan]

lemmie know how that stuff works. I have to do the krappisaki and tha bantam at some stage.

Welll I'm 1/2 way through doing it. It works well, but there is no where near enough 'metal ready' stuff in the kit. I went down to bunnings and bought 2 litres of Hydrochloric acid (spirits of salt) ~$20, and threw that in with 2l of water. Does a brilliant job - got about 1/2 a cup of rust out (just rust - not liquid!) Should have done that just before doing the metal ready. My metal ready was already all 'used up' (i.e. I still had liquid, but it did nothing) when I tried it after the HCl. My suggestion would be do the HCl then the metal ready. Since the metal ready was spent, I had nothing to stop the inside of the tank from rusting to hell (30 mins and its all brand new rust - just a thin layer though) after rinsing the HCl out before doing the sealer.

Another prob was getting liquids out of the tank - all the openings are at least 1" in from any side wall for the cibby - makes it incredibly difficult to drain the last bits out. Get a small pump and hose to drain it out properly.

BTW - having 'marine clean' on your paint work for a few seconds cleans/brightens it up no end. Not recommended though.

[FlyingDutchMan]

Heres a rant I had about what petrol to use in the CBR250 on another forum. Informative even if you don't have a CBR250.

http://www.cr-x.org/cbr250/forum/top...TOPIC_ID=29263

[Monsterbishi]

isnt "race gas" expired aviation gas, so it 100LL ?? spose it depends on what "race gas" you buy/use

Race gas is actually just re-named avgas, it's not expired at all actually, it's loaded with lead though, so I'd be hesistant to use it on a CBR250 for fear of what it may block along the way...

We've always run 96/95 in our MC19, never had any foulling issues. Main reason being that we live by the simple rule that if the engine has a compression ratio of 10:1 or higher, it should be run on high octane fuel, with the CBR's 11.3-11.5:1 ratio it's right up there, especially with the amount of advance in the ignition system.

That's $80(parts) plus another $60 (labour) for a set of fouled plugs.

Use 91.

Or you could just pull the fouled plugs out, clean'n'gap them and put them back in, which would cost all of $0.00

I can never understand people who think that a fouled plug means it needs replacing, it's right up there with anyone with a non-efi(well, anything without a knock sensor) bike thinking that higher or lower octane fuel gives them any better economy or more power. Octane rating determines one thing only, the point at which it ignites without the need for a spark. And whilst higher octane fuel does have a slower moving flame front, it's barely measurable on a small engine.

[_intense_]

You're much more likely to carbon them up with 98 than 91 simply because it runs too cold. You cannot get more power/efficency out of an engine by running a higher than required. All the CBR250 needs is 91, so you're wasting money by putting 96 or 98 or anything higher in.

AMEN, glad to see some of us have their head screwed on. as for 105... in the famous words of Rove Mcmanus: WHAT THE? run 91 bro you won't pay through the nose, you'll run with no fouling problems (assuming all is well in your engine) and still be able to smoke those pesky boy racers in their cages