HPI VS stock

[desertR]

Could also be the vent for the fuel tank. I hear that the shorty vent with the valve on top can fail. Pretty cheap thing to take out a motor with, I'm going to get rid of mine and go back to a hose.
desertR

[Jerry Hall]

Could also be the vent for the fuel tank. I hear that the shorty vent with the valve on top can fail. Pretty cheap thing to take out a motor with, I'm going to get rid of mine and go back to a hose.
desertR

Yes!      A hose without anything on it or in it, is best tank vent.

I have probably thrown away 50 of the billet piston shaped vent line bling things on customer motors that torched pistons.  Many of the springs in the check valve on these bling items are too strong.  This causes a vacuum to occur in the fuel tank and reduces the fuel supply to the carburetor.  It seems like most of the fuel tanks were full of fuel when these bling things failed to vent properly.

[evaneyeball]

i actually got arid of mine while back and went to a regular hose. and i talked to arlen and he said it needed a hone job and put it back together, he was impressed i didn't burn the piston to the ground lol

[desertR]

Ya most can't hear detonation, or know what it is. You got lucky it wasn't much worse.
desertR

[The norm]

Now Evan once you get it back together please start your jetting off at 48/180! The pilot circuit is only really going to change starting/idle.  If you can start your R without the choke your pilot is too rich! I'm not trying to be a jerk here buddy, but I believe that you were lean! Not lean enough to burn it up right away,  but lean enough to burn it up on a long hill at wfo throttle! My son's have similar engines and are both 48/178 and dgh needle at the 3rd groove. Please give that a try and prove me wrong if you can.
Loren

[broken1]

I 2nd what Loren said. A 55 is a big pilot. Joe's R had a 55 pilot & after dropping it down to a 48 it's still on the rich side down low.

[havinnoj]

Evan if you want help jetting, I'm happy to help you get setup either before the meetup or at the meetup.

[evaneyeball]

Yeah I might start at 180/48 and jet it down a little just so it isnt quite so fat. And then I'll jet it the rest of the way while I'm down there because I'm jetting for close to sea level and were at about 300 ft.

[desertR]

Jetting from sea level to 300 ft, will be the same, Very little difference in air density, and unless you have the proper instrumentation, it's not worth the time to do it. Engines will make more power when leaned out, right up until they melt a piston, so most stay 1 or 2 steps to the rich side
desertR

[The norm]

Evan I have a feeling that you won't need to go lower than a 178 as you had piston failure with a 170..... You will be surprised to find that your R will run just fine at 48/180 until you try hitting 3/4-full throttle. If in fact 180 is too rich your engine will start breaking up. When jetting I don't shoot for perfection,  I shoot for reliable jetting that I can live with all year. So I try to set my main jet in February when I go to florence.

[evaneyeball]

I cant get to 3/4 full throttle here because 1 room and 2 I only have paddles right now and I dont go for perfect jetting either and I thought I was rich but obviously wasn't and I also like the extra piece of mind that i jetted at sea level, even though it does nothing

[havinnoj]

Sorry if this was mentioned previously but what needle are you running Evan?

[evaneyeball]

So I got my hpi on and set I will put up the electrical on tomorrow I also put on my top end and new reed cage, they're v force 3's.

[The norm]

Be very sure that you jet correctly! 48/180!

[evaneyeball]

Will do sir