badassbanshee
New member
New guy here hoping to get some opinions on why I keep destroying the right cylinder on my 1995 v-max 600...
Last year I let my buddy take it out on the lake and he burned up the right piston/cylinder. I chalked it up as "operator error" and rebuilt her. I had the right cylinder replated, got 2 new SPI pistons, rings, and gaskets. I made sure there was no garbage in the case, carbs were SPOTLESS, adjusted both floats and jetted the main up 2 sizes to a 160. Bled the cooling system at the thermostat and the rear exchanger. I also pressured tested it after assembly just to rule out air leaks. It held 6psi for 10 minutes so I figured I was good...
Went easy on her for about a half tank just putsing around in a field and she ran/idled great. Took her home, pulled the plugs and they looked great. Compression tested it just to see and had 136psi in each hole. Awesome! It's fixed so lets go ride it.
Go out the next day with a buddy. Not absurdly cold... in the low to mid 20's with 6 inches of new powder. Rode around for about 4 hours on old railroad grades, fields and the occasional plowed dirt road. Ran great the whole time until the point we lined them up on the road. Had the throttle wide open for maybe 30 seconds and she spits and looses power. I get it stopped, pop the hood and am greeted with a blast furnace. I yank the plugs and to my disgust find the right electrode smashed.
Fed up I called it a season, put it in the garage under a cover and ignored it...
Well riding season is here and rebuild number two begins...
Anyone have an idea of what I missed last time? I'm stumped.
Last year I let my buddy take it out on the lake and he burned up the right piston/cylinder. I chalked it up as "operator error" and rebuilt her. I had the right cylinder replated, got 2 new SPI pistons, rings, and gaskets. I made sure there was no garbage in the case, carbs were SPOTLESS, adjusted both floats and jetted the main up 2 sizes to a 160. Bled the cooling system at the thermostat and the rear exchanger. I also pressured tested it after assembly just to rule out air leaks. It held 6psi for 10 minutes so I figured I was good...
Went easy on her for about a half tank just putsing around in a field and she ran/idled great. Took her home, pulled the plugs and they looked great. Compression tested it just to see and had 136psi in each hole. Awesome! It's fixed so lets go ride it.
Go out the next day with a buddy. Not absurdly cold... in the low to mid 20's with 6 inches of new powder. Rode around for about 4 hours on old railroad grades, fields and the occasional plowed dirt road. Ran great the whole time until the point we lined them up on the road. Had the throttle wide open for maybe 30 seconds and she spits and looses power. I get it stopped, pop the hood and am greeted with a blast furnace. I yank the plugs and to my disgust find the right electrode smashed.
Fed up I called it a season, put it in the garage under a cover and ignored it...Well riding season is here and rebuild number two begins...
Anyone have an idea of what I missed last time? I'm stumped.
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did you ever remove the screens under the needle/seat and check them for debris?
badassbanshee
New member
Just took a look. Pulled the main and saw the bottom of the needle... but no screen. Is there supposed to be a screen?
It was clean in there though.
It was clean in there though.
Hammer Down
Member
Mrviper means the needle and seat which is under the float. You need to remove the float and check the needle/seat. There is a screen under there that may be clogged.
badassbanshee
New member
I see what you guys are talking about. Had no idea there was a screen under there 
but it was clean.
Been messing around with Keihns on Banshees for too long...
but it was clean.Been messing around with Keihns on Banshees for too long...
cant see your pictures, but heres a couple of things to consider assuming your jetted correctly.
first is the vent hose routing. if those lines arent pointing down towards the bottom of the bellypan, you can create a lean condition. common mistake when removing and re-installing the carb rack.
second is the fresh powder you were riding in. missing the filter material on the hood can increase the chances of carb icing. combine that with low grade fuel or even ethanol fuel and you will create a lean condition. any water in the tank or fuel further compounds the icing of the carbs, creating even more lean.
lastly, you didnt mention any performance upgrades. pipes? porting? head work? as you know, any of these mods along with poor fuel is a recipe for disaster.
i always lost the mag side, but i attributed that to the bumped timing with bad fuel.
first is the vent hose routing. if those lines arent pointing down towards the bottom of the bellypan, you can create a lean condition. common mistake when removing and re-installing the carb rack.
second is the fresh powder you were riding in. missing the filter material on the hood can increase the chances of carb icing. combine that with low grade fuel or even ethanol fuel and you will create a lean condition. any water in the tank or fuel further compounds the icing of the carbs, creating even more lean.
lastly, you didnt mention any performance upgrades. pipes? porting? head work? as you know, any of these mods along with poor fuel is a recipe for disaster.
i always lost the mag side, but i attributed that to the bumped timing with bad fuel.
badassbanshee
New member
Ok guys, edited my original post so the pictures can be seen now. Hopefully the pictures will shed some light...
I also forgot to mention I am running a set of dual PSI pipes. Other than the pipes and bumped jetting this is a completely stock machine.
I also forgot to mention I am running a set of dual PSI pipes. Other than the pipes and bumped jetting this is a completely stock machine.
roudyroy1
Active member
crank seal starting to show its age??
its lean..... not badly lean but its lean by the piston pics. I didnt have a 1995 book but when I look up a 600 twin it shows me the stock jet was a 151.3, so you have 160's now but if the needle is too low, then the main jet differance wont help much as the needle is hanging down into the nozzle not allowing the main full flow.
so my questions would be:
1.) wheres the needles set at?
2.) what jetting specs does psi reccomend for the pipes?
FYI- the reason the mag usually goes down in the older engines is its the cylinder that gets the most spark power(so it runs the hottest), closet to the source, the 98-99 srx same way. usually the mag cylinder would have a larger jet then the pto side.
so my questions would be:
1.) wheres the needles set at?
2.) what jetting specs does psi reccomend for the pipes?
FYI- the reason the mag usually goes down in the older engines is its the cylinder that gets the most spark power(so it runs the hottest), closet to the source, the 98-99 srx same way. usually the mag cylinder would have a larger jet then the pto side.
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badassbanshee
New member
I think your onto something Mrviper...
I took a closer look and discovered this thing had a 45 pilot in it and the needle was at the bottom setting. The guy I bought it from was the original owner and he said it was piped, jetted and clutched by Yamaha. I believed him and assumed it was set up properly...
I've tried to find jetting info on the psi pipes but have so far been unsuccessful. I also tried to find some contact info for PSI but found nothing. I'm wondering if their even in business anymore...
Does anyone have any jetting info for these pipes? I'm in Michigan at around 600ft. Any help would be greatly appreciated. We just got about 6 inches yesterday and I'm chomping at the bit to get riding!
I took a closer look and discovered this thing had a 45 pilot in it and the needle was at the bottom setting. The guy I bought it from was the original owner and he said it was piped, jetted and clutched by Yamaha. I believed him and assumed it was set up properly...
I've tried to find jetting info on the psi pipes but have so far been unsuccessful. I also tried to find some contact info for PSI but found nothing. I'm wondering if their even in business anymore...
Does anyone have any jetting info for these pipes? I'm in Michigan at around 600ft. Any help would be greatly appreciated. We just got about 6 inches yesterday and I'm chomping at the bit to get riding!