TE/TC Hearing detonation in front of motor

Well, mixing Dragon fuel (true 95oct) 25% or so mix in with pump gas and last 2 rides its quiet. Im 2 out on AS

First i

miss quoted MJ, its a 168 (as per JD at my alt), and yes i think you were right i mixed 95oct in and its now quiet last ride and 1 race. Ty

And i also misquoted needle color, im on Red. I keep looking at the te250 side of my instructions, sorry again guys for confusion on my first post.

Well, I got a pail of VP 110 and ran it for a couple of hours today - exhaust smells GREAT, but I digress... I ran it under conditions that would usually produce the knock and I heard nothing at all. So far, it seems like an octane thing. I really don't want to buy 5 gal jugs of VP at ~$70 a pop, so if this really addresses my problem, I'll probably try the 100 octane pump gas I can get around here. This weekend's hare scramble should let me know for sure if it was fuel, and I'll post my findings.

It was octane issue in my bike. I used 95 dragon fuel, changed to 110 race pump gas, plug is light brown instead of wet black, no spooge on pipe after race, knock went away.

I believe that better fuel has a lot more benefits than getting rid of a death knock. Longer shelf life without additives, not corrosive, starts easier, doesn't dry up rubber "O" rings and harden plastic parts, doesn't varnish up while sitting for short periods, can be tuned on the crisp edge without triggering detonation. To sum it up, we are buying and riding performance engines intended for racing so using race fuel seems to be common sense. I attribute good fuel to longer engine life and a cleaner combustion and exhaust. This means more riding and less working on your engine and fuel system. I'll gladly pay an extra $1.50 per gallon for that. (here in MO pump 93 is $2.49 and LL100AV is $3.99)

Pmsl $2,50 for a gallon!?! I pay £1.28 per litre for shell VP nitro. Lol you guys get far more for your money!

Wow - $2.49/gal is nice. The 100 up here (Chicago area) is about $7/gal. Better than $14/gal for the VP though, so I hope 100 does the trick too.

Incidentally, I found another station with 110 at the pump, but it says "leaded race fuel". I believe the VP 110 that bought was leaded (TEL). Can I just use the "leaded" pump gas? Any danger there?

What oct rating is it?

Is this aviation gas? Thats cheap. I gotta look into this. I heard boat marinas will sell ethanol free 95oct

That's 99ron straight from the pump.
At most shell garages in UK.

Av gas is for low rpm engines not high rpm motorcycles.....

Leaded gas is fine

Lots of opinions about this av110ll, i hear its better than pump but race gas is best. But, av wont hurt. Just some write ups im reading

I would just mix it like i do with race gas, instead of straight. Av gas is low lead

Do what you want.... Watch what you read on the internet... Make sure to research.... AV gas is meant for low rpm airplanes and different burn rates... I'll get with my vp and f&l guys to get the info...

If you are going to mix just mix race gas and pump....

The AV100LL is aviation fuel and I buy it at our local airport. I've also used VP110 which runs better in my YZ450 that I re-mapped to take advantage of the better octane but the AV100LL and the VP110 run about the same in my WR250 Husky. I've heard a lot of different things said about why you shouldn't run AV100LL but it has never been backed up with anything other than opinion.

Where did you get this information?

VP guy

Remember gas you buy at the corner station is made to burn in new cars , not dirt bikes that are made to race and dam sure not a 2 stroke engine. Would'nt slower burning gas require a more advanced engine timing? Hotter gas I think would burn the best closer to tdc.
I too like the vp brand its expensive but I think its worth it also. (no doubting about fuel any more)