Bad weekend in Glamis! Need a little advice.

[silencethevoice]

Well, I just took my bike to glamis to try out a new set of mods/top end, and things didn't go so well.. I melted holes in the top of my pistons :shoothead:..

 

I am running stock bore cylinders, with Eric Gorr Mo' Power Everywhere porting, Cool Head with 20cc domes, +4 Timing Advance, V-force 3 Reeds, FMF fattie pipes, and a Trinity 2 into 1 setup with a 38mm pwk. I thought I had my jetting dialed in pretty well before I left (I live in San Diego), I was running a 42 pilot, 220 main, and the clip on the 5th from the top. I was running this on setup on 92 octane pump gas at 32:1.

 

The bike seemed to run pretty well for me, no pinging or anything out of the ordinary. I let my brother ride it to the drags, and on the way back he was complaining about it feeling like it was running only on one cylinder, right before it died.

 

So, where should I go from here? Does it seem like I was running my pilot lean, and this caused it to burn up, or did I just over do it on pump gas? I am seriously considering going back to duals at this point, because although it did run pretty well, it still seemed like it was capped off a bit.

 

This bike will spend 90% of its time in the dunes, and hill shooting.. Just looking for any opinions on the situation.

 

Thanks in advance.

 

Ryan

[Bansh-eman]

Well, I just took my bike to glamis to try out a new set of mods/top end, and things didn't go so well.. I melted holes in the top of my pistons :shoothead:..

 

I am running stock bore cylinders, with Eric Gorr Mo' Power Everywhere porting, Cool Head with 20cc domes, +4 Timing Advance, V-force 3 Reeds, FMF fattie pipes, and a Trinity 2 into 1 setup with a 38mm pwk. I thought I had my jetting dialed in pretty well before I left (I live in San Diego), I was running a 42 pilot, 220 main, and the clip on the 5th from the top. I was running this on setup on 92 octane pump gas at 32:1.

 

The bike seemed to run pretty well for me, no pinging or anything out of the ordinary. I let my brother ride it to the drags, and on the way back he was complaining about it feeling like it was running only on one cylinder, right before it died.

 

So, where should I go from here? Does it seem like I was running my pilot lean, and this caused it to burn up, or did I just over do it on pump gas? I am seriously considering going back to duals at this point, because although it did run pretty well, it still seemed like it was capped off a bit.

 

This bike will spend 90% of its time in the dunes, and hill shooting.. Just looking for any opinions on the situation.

 

Thanks in advance.

 

Ryan

 

 

for drag and hillshooting you should have been on duel carbs any how but... your pilot is WAY lean... you should have around a 52-55 pilot...and you should probly be running 50/50 race gas and 91 oct... i run 158 mains 55 pilots on 22 domes and run 50/50... you need to do a compression check and see what you got and that will tell you what gas to run...

[silencethevoice]

for drag and hillshooting you should have been on duel carbs any how but... your pilot is WAY lean... you should have around a 52-55 pilot...and you should probly be running 50/50 race gas and 91 oct... i run 158 mains 55 pilots on 22 domes and run 50/50... you need to do a compression check and see what you got and that will tell you what gas to run...

 

Yeah, that was definitely a bad idea to not do a compression test.. I guess I figured I would hear it pinging before something happened, and then know then that my octane was off.. That was lame.

 

As for my pilot, I tried running a 48, 50, and a 58 in there, and they all seemed way too rich.. But as soon as I stepped down to the 42, throttle response got really nice and crisp... Oh well, put that setup on ebay I guess, and take a loss..

 

But anyways, if I want to run pump gas, what kind of domes should I be using? you say you are running 50/50 with 22 domes? You can't run straight pump gas with your 22s? or do you just like to run race gas... Are you ported at all? Also, I have a single 33pwk already, would it be worth it for me to buy another 33 and run dual 33s? Or would you recommend 35/34s?

 

Thanks for the quick response..

 

Ryan

[Bansh-eman]

Yeah, that was definitely a bad idea to not do a compression test.. I guess I figured I would hear it pinging before something happened, and then know then that my octane was off.. That was lame.

 

As for my pilot, I tried running a 48, 50, and a 58 in there, and they all seemed way too rich.. But as soon as I stepped down to the 42, throttle response got really nice and crisp... Oh well, put that setup on ebay I guess, and take a loss..

 

But anyways, if I want to run pump gas, what kind of domes should I be using? you say you are running 50/50 with 22 domes? You can't run straight pump gas with your 22s? or do you just like to run race gas... Are you ported at all? Also, I have a single 33pwk already, would it be worth it for me to buy another 33 and run dual 33s? Or would you recommend 35/34s?

 

Thanks for the quick response..

 

Ryan

 

my compression is 145 so i run 50/50... i got it ported but nothing crayz...33 pwk should be ok.. my 34s are already jetted for glamis but i wanted to do a bigger carbs and intake so im selling all my stuff...

[Handyman]

you selling your 33's? Would they take the OEM slides? That is if you're selling them?

[dawarriorman]

I run straight AV gas with 21 cc domes and +4 timing. Im right at 155 lbs in both cylinders. You should measure your compression, but I would be running at least a 50/50 mix in your bike.

[TOYBOX]

I run a single on both my bikes, I'm at sea level and have one for hillclimbs, one for drags. Your pilot is fine, the main is scary, way to high. I have a lot more work done to my bikes,(one is a 409) and I'm running 180-190 main, no airbox. When a bike is on a single and the main is that high, it sounds like it had an air leak. I have found, with the singles, it "highlights" a bad crank seal. Also, I put sealer on the intake gaskets, its a mess when you change reeds, but you won't be leaking ! Hope this helps.

[silencethevoice]

I run a single on both my bikes, I'm at sea level and have one for hillclimbs, one for drags. Your pilot is fine, the main is scary, way to high. I have a lot more work done to my bikes,(one is a 409) and I'm running 180-190 main, no airbox. When a bike is on a single and the main is that high, it sounds like it had an air leak. I have found, with the singles, it "highlights" a bad crank seal. Also, I put sealer on the intake gaskets, its a mess when you change reeds, but you won't be leaking ! Hope this helps.

 

I am pretty sure I wasn't running with an air leak.. I put sealer on the base gaskets.. I did the old WD-40 spraydown around the reeds and the bottom of the cylinders to make sure there was nothing going on... I started out with a 210 when I got to glamis, then bought a 215 and a 220 to see if it would run better on top, and it did.. Maybe it was because of the compression I was running on pump gas.. Who knows.. How does one go about testing the crank seal?

[Bansh-eman]

I am pretty sure I wasn't running with an air leak.. I put sealer on the base gaskets.. I did the old WD-40 spraydown around the reeds and the bottom of the cylinders to make sure there was nothing going on... I started out with a 210 when I got to glamis, then bought a 215 and a 220 to see if it would run better on top, and it did.. Maybe it was because of the compression I was running on pump gas.. Who knows.. How does one go about testing the crank seal?

you need to do a leak down test to see that your lower half isnt leaking... do a shearch on here or ask RNBRAD he made a post with al the things you need to make your own kit for like 15 bucks... guy on here named machwon sells them as well...

[Leadfoot350]

ya dont take it apart without doing a leak down test. I was at glamis last weekend too with a newish set up and my bike flat out hauls on the top end but before that I need to work out the jetting. On my single 35pwk I ran a 52 pilot a dek needle in the 4th clip and a 210 main. Im not sure how that compairs to a 38 though.

[silencethevoice]

ya dont take it apart without doing a leak down test. I was at glamis last weekend too with a newish set up and my bike flat out hauls on the top end but before that I need to work out the jetting. On my single 35pwk I ran a 52 pilot a dek needle in the 4th clip and a 210 main. Im not sure how that compairs to a 38 though.

 

Wish I could have done a leakdown before tearing it apart.. There were two quarter size holes in my pistons, so that really wasn't an option! :laugh: Mine ran pretty well before it went also, really strong on the bottom and mid, I could pretty much just blip the throttle in 3rd and 4th and pull the tires off the ground. But I really missed the standard banshee mid-top pipe hit. I am sure some really like it that way, but it was too smooth for me. I like the way the powerband used to surge in all at once.. Just preference I guess.

 

The bike is getting bored at alba right now, and I am going to try a pair of 33pwks instead this time.. Hopefully all goes well. I am pretty damn sure there were no air leaks, but then again.. Can someone explain to me how a crank seal going bad can cause an air leak? The only crank seals that I know of are on the ends, in which case how would I get an air leak? Would the piston start sucking air through the clutch compartment (if I had an air leak on the stator side, I am sure I would know about it!)... Can anyone enlighten me?

[addicted]

Wish I could have done a leakdown before tearing it apart.. There were two quarter size holes in my pistons, so that really wasn't an option! :laugh: Mine ran pretty well before it went also, really strong on the bottom and mid, I could pretty much just blip the throttle in 3rd and 4th and pull the tires off the ground. But I really missed the standard banshee mid-top pipe hit. I am sure some really like it that way, but it was too smooth for me. I like the way the powerband used to surge in all at once.. Just preference I guess.

 

The bike is getting bored at alba right now, and I am going to try a pair of 33pwks instead this time.. Hopefully all goes well. I am pretty damn sure there were no air leaks, but then again.. Can someone explain to me how a crank seal going bad can cause an air leak? The only crank seals that I know of are on the ends, in which case how would I get an air leak? Would the piston start sucking air through the clutch compartment (if I had an air leak on the stator side, I am sure I would know about it!)... Can anyone enlighten me?

If a crank seal leaks on the clutch side it sucks gear oil, if it leaks on the stator side it sucks air. I do a leakdown test every time I put a 2-stroke together. I do it on the bench before it goes in the bike. If you do it then, you can catch a problem before it causes harm and it only takes few minutes. IMO, a leakdown tester is a must have tool for engine assembly.

[Leadfoot350]

ya the clutch side is easy to tell if you have a leak and it will not hurt anything. It will just dump all your clutch oil out the exhaust and oil down the ridder behind you. Oh well just rebuild it and do a leak down test. Is your bike ported? If not or you want more power you should pm herrjugsracing.com and have him check out your cylinders to see if you can get more power out of them. He lives very close to Alba so its worth it to see what he thinks.

[silencethevoice]

ya the clutch side is easy to tell if you have a leak and it will not hurt anything. It will just dump all your clutch oil out the exhaust and oil down the ridder behind you. Oh well just rebuild it and do a leak down test. Is your bike ported? If not or you want more power you should pm herrjugsracing.com and have him check out your cylinders to see if you can get more power out of them. He lives very close to Alba so its worth it to see what he thinks.

 

 

Yah I've got the Gorr Everywhere port on my jugs... I will definitely do a leakdown test before running this time. Gonna go to the hardware store on the way home from work today and see what I can dig up... The guys at Alba seemed to think I was really just overdoing it on pump gas... But they didn't rule out the possibility of an air leak.. They said 20cc domes, and +4 timing would probably be too much.. They even measured my exhaust port height to make sure.. So I am going with stock timing and 21cc domes this time around.. But I'm definitely testing it... Just hope I can get 'er all finished before the weekend. Glamis on Halloween is pretty crazy. :beer:

[Leadfoot350]

ya that might be on the border for pump gas. I would mix a gallon of race gas with 4 gallons of 91 octaine if you want to run 20cc domes. That would give you 94.8 octaine. Well if you ever looking for more power or just want to talk to a good local builder to you call Kevin.