HPI VS stock

[desertR]

Your lucky it's not worse. I expected to see a partially melted piston, but you won't know for sure until you pull the cylinder
desertR

[evaneyeball]

I am running straight vp110 with klotz r50 mixed in at 40:1 it does have a gouge in the cylinder. I talked to arlen and told him I'd like to run a cylinder size in the 300's some where and he said all his are on back order from 300 to 310 ceo cylinders and mine is on its last bore so I'm in kind of a dilemma

[The norm]

So we know what octane fuel you are using and your mix ratio, but we do not know your jetting! Going up banshee hill is going to be on your main jet mostly. If you have any kind of porting and are running an after market pipe you better have at least a 175 main!

[evaneyeball]

I'm using a James lucky intake a cr500 carb a ct racing port and a aaen pipe. When I got my motor back from arlen a while ago he told me to start out at a 170 main and a 58 pilot and when i put that in and at the dunes it was running rich in the bottom end so i changed out the pilot to a 55 and it ran great and that was the first ride on it so if it was a jetting issue wouldn't it have seized already or does it take that long for it to sieze with lean jetting? I have about 8 to 10 hours on the motor

[The norm]

Because of the 55 pilot you were probably getting enough fuel through that circuit bleeding through to keep it from seizing until you started doing long uphill pulls.
I would have started at 50 pilot/180 main and worked from there.

[Hawaiiysr]

Better to start FAT!

[evaneyeball]

Yup she's f*cked up. I pulled the cylinder and the piston isnt great so I'll replace it once I get a 310 because my sleeve is coming off the cylinder and also just the cherry on Top is my head is all pitted from before and also my reeds are completely see through

[Hawaiiysr]

doesnt look like the sleeve moved. is this stock jug? if so the sleeve does not just come off. sure looks salvageable to me. the head and piston is a different story

[evaneyeball]

Theres a big crack in between the sleeve and cylinder you can't really see it in the picture and it is a 85 cylinder and there are big burn/scratch Mark's above the where the reeds go in

[The norm]

Most definitely lean

[The norm]

I wouldn't worry about that! Hone it and see what it looks like. Honing at home can for sure ruin your cylinder so you better be careful

[2ndmoto]

To add, You might have run the float bowl dry which would cause it to lean out. When doing hill climbs, the gas will be towards the back of the bowl, which makes the Venturi effect less effective on pulling gas through the main jet

 Any one else running klotz at 40:1? I honestly don't know much about the product. Probably over 20 years ago since I ran it

If you can't catch your finger nail on the scratches on sleeve, have Arlan check it. You might be able to hone it and be on your way.

[evaneyeball]

I can barely feel it with my finger nail and so you do think that my detonation is coming from lean fuel and not from a bad cdi. And it only detonates when going up hill

[The norm]

I run klotz R50 at 40:1 and have for 6 years. A bad cdi in my experience won't allow the engine to rev. I have never experienced detonation due to a bad cdi. The only time I had detonation was when I had a bdt 17.5:1 dome in a pump gas cylinder lol. Evan your engine ran lean! You have to figure out why! Could be your petcock, but I feel it's your main jet!

[evaneyeball]

could my reeds that are shot have something to do with it, there are big gaps in between the pedals and the cage. but in my mind the gap is letting more gas in but i could be wrong and i will take a look at my main jet and i next time i will start out super fat and go lean.