Mine did that today, but like stated above, I have what looks to be bare metal/specs at the end. It made a pop sound, and the engine stopped. Clutch only moves half turn and no pull on the pull rope. Hoping that it may be only a top end rebuild, but with my luck, something more major happened.
Ever seen this??? Sparkplug gap closed?
- Thread starter towny
- Start date
Summary
I would have that head off ASAP--if it slammed the plug closed like that--it did not just happen--from those of us who have had a couple motors smoke down on us--If that has happened--there is something WRONG inside the motor.
Plain and simple---That is a "BAD" thing.
H20SKE...
I would have that head off ASAP--if it slammed the plug closed like that--it did not just happen--from those of us who have had a couple motors smoke down on us--If that has happened--there is something WRONG inside the motor.
Plain and simple---That is a "BAD" thing.
H20SKE...
I didn’t notice any metallic specks on the plug! In fact, it actually looked good as far as color goes??
I replaced it and rode for about 45 min back to the truck. It seemed to run the same as it did before???
Hit a rock earlier in the day and examining it further. Looks like I’ll be pulling the engine and replacing/straitening some stuff before It gets back on the snow.
This will be a good time to dig into the engine and see what’s up?
As soon as I get it apart I’ll let you know what I find!
Thanks everyone and have a great new year!
By the way this is the second engine and it’s got 400+ miles on it.
I replaced it and rode for about 45 min back to the truck. It seemed to run the same as it did before???
Hit a rock earlier in the day and examining it further. Looks like I’ll be pulling the engine and replacing/straitening some stuff before It gets back on the snow.
This will be a good time to dig into the engine and see what’s up?
As soon as I get it apart I’ll let you know what I find!
Thanks everyone and have a great new year!
By the way this is the second engine and it’s got 400+ miles on it.
Pull it apart now, before it gets expensive- my bet piston skirt
When I smoked the first engine down--did about the same thing--spark plug got slammed shut--not metal on it--regapped it and rode it for about 4 or 5 hours and on the way out--it slammed the plug agian--this time it was the bearings(crank) that allowed the picton to come up and hit the plug. Get in the motor and check it out.
Something is not right.
H20SKE...
Or face a tow out of somewhere.
Something is not right.
H20SKE...
Or face a tow out of somewhere.
Got the head off and I can’t find a thing wrong with it!
There are no marks what so ever on the top of piston or on the domes? No sign of detonation!
It looks really good!
I haven’t gotten to take a look at the piston skirt on the intake side yet, but I suspect it will be OK?
This is really weird??? Glad nothing seems to be damaged but Weird!!
Don’t know how the piston could hit the tip of the plug as it’s just barely sticking into the dome. The top of the piston would have to smash right through the squish band to get to it? Or have come apart, which it didn’t.
Maybe I just Fu*ked up and dropped the plug before I installed it?? I’m pretty careful not to do things like that but I can’t say for sure it didn’t happen?
Don’t think that was the case because I put several hundred miles on it before it started missing?
Here some crappy pictures, sorry!
There are no marks what so ever on the top of piston or on the domes? No sign of detonation!
It looks really good!
I haven’t gotten to take a look at the piston skirt on the intake side yet, but I suspect it will be OK?
This is really weird??? Glad nothing seems to be damaged but Weird!!
Don’t know how the piston could hit the tip of the plug as it’s just barely sticking into the dome. The top of the piston would have to smash right through the squish band to get to it? Or have come apart, which it didn’t.
Maybe I just Fu*ked up and dropped the plug before I installed it?? I’m pretty careful not to do things like that but I can’t say for sure it didn’t happen?
Don’t think that was the case because I put several hundred miles on it before it started missing?
Here some crappy pictures, sorry!
The same thing happened to my RT1000 last year...... Then it burned down.... I don't have any advice though, I took mine apart too.
It couldn't be a buddy screwing with you could it? We used to close the gap on one plug of the old tripples if someone got bored while waiting for a tour to show up.
Closed gap also
I also had this happen. In my case there were no mechanical problems like the other posts. I had some custom machining on a stock 02 700 rmk head. It was not on the first ride but after 500 miles I was smoking across a lake when all of the sudden it lost a cylinder. When I pulled the plugs one gap was closed. After installing new plugs the machine never missed a lick for the rest of the year. I think it lost a piece of carbon and just happen to close the gap. I for sure had no detenation. Still black magic to me!!
I also had this happen. In my case there were no mechanical problems like the other posts. I had some custom machining on a stock 02 700 rmk head. It was not on the first ride but after 500 miles I was smoking across a lake when all of the sudden it lost a cylinder. When I pulled the plugs one gap was closed. After installing new plugs the machine never missed a lick for the rest of the year. I think it lost a piece of carbon and just happen to close the gap. I for sure had no detenation. Still black magic to me!!
S
Summit 800
Well-known member
mine did that on an 04 Doo 800. Broken ring was my problem.
happened to me once, ring broke and bounced around tore some chit up. New piston, new cyl jugg and some head surfacing. Don't know what to tell ya. Talk to slp!
Do a compression test, I have had it happen when chit broke, BUT I also had it happen on my 01 800 summit from Detonation, I checked compression and have been running the same engine after it did it for over 1000 hard miles. So yes, it can happen from detonation.
Better to be safe than sorry, a broken ring or skirt can cause it. A skirt can spit out the exhaust and not see any other visible damage from the outside and it will still run sometimes, for a bit.
Better to be safe than sorry, a broken ring or skirt can cause it. A skirt can spit out the exhaust and not see any other visible damage from the outside and it will still run sometimes, for a bit.
A local dealer told me once..
The 07's (some of them) had the bearings go, too tight tolerences, and pieces of the bearing would get shot up and spit out, and mashing inside the heads. Dealerships would see small pitting, and assume detonation, and replace the required parts... thinking it is bad fuel or something.. Later the bottom ends go and then you are looking at more fun..
I would get your crank checked.. It might cost less now.
The 07's (some of them) had the bearings go, too tight tolerences, and pieces of the bearing would get shot up and spit out, and mashing inside the heads. Dealerships would see small pitting, and assume detonation, and replace the required parts... thinking it is bad fuel or something.. Later the bottom ends go and then you are looking at more fun..
I would get your crank checked.. It might cost less now.
Agreed.
Pop the top and look. Ive had this same thing happen with a piston skirt on a mod jet ski. there where multiple pieces that formed a ball and beat the plug shut and damaged the head. After replacing the plug it ran for a bit--and then destroyed the entire cylinder, chunks into the bottom end, etc.
detnoation... it can bend, break, erode, hammer
many things can bend the electrode... broken parts are the no brainers... yet detonation works like a hammer when ignition occurs at the wrong time with fuel and air present.. it can erode the top of a piston, make small or big holes, shatter the life out of the piston rings, flatten bearings..... in a car you can hear it best, sounds like some one hammering on the inside of the cylinder head..... in a minor case, one can look for small white flecks on the plug, which again is from the pistons..
many things can bend the electrode... broken parts are the no brainers... yet detonation works like a hammer when ignition occurs at the wrong time with fuel and air present.. it can erode the top of a piston, make small or big holes, shatter the life out of the piston rings, flatten bearings..... in a car you can hear it best, sounds like some one hammering on the inside of the cylinder head..... in a minor case, one can look for small white flecks on the plug, which again is from the pistons..
