freelheeler
Pro
another thought
due to rolling the sled over when stuck or hell just for fun, i get a bit of oil in the air box thus the foam was soaked with oil (cleaned), could this have been another contributer to air flow restriction.
my general primus at this point is my sled has been running rich. and when air flow is restricted even a litte (big snow days) it causes massive bogging. by leaning out the sled to a hopefully normal condition or on the lean side, restriction of air should affect the sled less?
plus i'm installing a fan!
due to rolling the sled over when stuck or hell just for fun, i get a bit of oil in the air box thus the foam was soaked with oil (cleaned), could this have been another contributer to air flow restriction.
my general primus at this point is my sled has been running rich. and when air flow is restricted even a litte (big snow days) it causes massive bogging. by leaning out the sled to a hopefully normal condition or on the lean side, restriction of air should affect the sled less?
plus i'm installing a fan!
freelheeler
Pro
how'd the fan work out?? 30" would be enough to get mine bogging.
installed my fan last night it fit rather nicely in the nose of the machine, point down ward in order to hopefully facilitate air movement into the belly and air intake. thought about installing it like an exhaust fan but were do you mount it to prevent build up on the exhaust? figured its better suited to move air around i haven't had the issue with icing on the airbox and that's a concern. i'm optimistic!
in summary, in order to reduce bogging, popping, and backfires aka hopefully a rich condition, and minimize loading of the engine and facilitate air flow around the engine and intake.
-rejetted my MJ 135 to 130
-moved needle 4th from top
-cleaned carbs including pilots
-decreased secondary 10 degrees to 100
-installed fan
tomorrow we set out on a long weekend in cooke, locked and loaded!
installed my fan last night it fit rather nicely in the nose of the machine, point down ward in order to hopefully facilitate air movement into the belly and air intake. thought about installing it like an exhaust fan but were do you mount it to prevent build up on the exhaust? figured its better suited to move air around i haven't had the issue with icing on the airbox and that's a concern. i'm optimistic!
in summary, in order to reduce bogging, popping, and backfires aka hopefully a rich condition, and minimize loading of the engine and facilitate air flow around the engine and intake.
-rejetted my MJ 135 to 130
-moved needle 4th from top
-cleaned carbs including pilots
-decreased secondary 10 degrees to 100
-installed fan
tomorrow we set out on a long weekend in cooke, locked and loaded!
Kachess
TY 4 Stroke Junkie
I don't get the needle"fourth from the top". Is the clip on the fourth notch down from the top? We run ours on the second notch down from the top. So your needles are higher, which means a richer midrange. I thought you wanted it leaner.
We rode in some very deep snow yesterday, but it was a little above freezing and the snow was heavier and not the dry flowing over the hood stuff. Sled ran fine, except after very very long, full open throttle, pulls, we would chop the gas and the the engines would stumble and and sound like they were running only on two or three cylinders. They would then clean out. I turned on my fan and it seems to possibly help, but the stumble did not happen every time, and I'm not sure it is the same as the "snow over the hood issue". One thing I do recall when I've had the "snow over the hood issue" is that it has also involved long sustained full throttle running, which would point to heat being the cause.
We rode in some very deep snow yesterday, but it was a little above freezing and the snow was heavier and not the dry flowing over the hood stuff. Sled ran fine, except after very very long, full open throttle, pulls, we would chop the gas and the the engines would stumble and and sound like they were running only on two or three cylinders. They would then clean out. I turned on my fan and it seems to possibly help, but the stumble did not happen every time, and I'm not sure it is the same as the "snow over the hood issue". One thing I do recall when I've had the "snow over the hood issue" is that it has also involved long sustained full throttle running, which would point to heat being the cause.
freelheeler
Pro
back from the weekend... generally the sled ran spot on! however i did have a few major concerns.
day 1
fan, worked excellent, we found some excellent deep powder over the hood type riding and i started to feel the dreaded bogs, flipped the switch on the fan few seconds later and it just seemed to clean out and purrrrr again!
day 2
hot seemed like mid 40's plus and sunny, snow was melting and we were riding in more or less long sleeve t shirts, beautiful. sled was running strong all morning lots of playing and hard riding just go, go, go. i started to feel it miss or slightly bog in the low end but it seemed to clean out at a little higher rpm. flipped the switch to the fan thinking things were hot and maybe a little more air flow would be a good thing.
anyhow we're down in this steep north facing drainage, again it feels like it's near 50 degrees, but the snow is still real nice and we're climbing and playing hard. the group decides to move to another area so we find a good route up and out. i'm following the group and all the sudden the sled bogs and stops dead mid hill. it's like it just ran out of fuel!! no bang, clank, smoke or anything. i grab for the the break and keep it from rolling, it's a pretty bad spot.
so i hit the key a few times and it will not start, i just it choke and it starts and runs for a second but really go and dies with the choke off? after a bit a buddy gets turned around and comes looking for me. we're able to get the sled turned around and coost it to the bottom of the drainage! and there i sit for the next 1.5 hours, pulling plugs, checking gas pumps, carbs, etc. nothing works i splash gas in the carbs and still nothing! to make things better i'm starting to get concerned about my battery!
so i'm dead in the water at the bottom of this huge drainage. i honestly don't know if we could pull the sled out! so i borrow a buddy's sled and bomb back to the truck for more tools and starting fluid. the only other time this has happened (which i posted about a few months ago) starting fluid worked and the sled ran great the rest of the day. so 1.5 hours later i'm back to the sled and spray down the carbs, hit the key, nothing! minutes later the battery is dieing and barely turns it over. yeehaw...
one last ditch effort before attempting to pull the sled. i rap a rope around the primary and attempt to pull start, 2, 3, 4, attempts then with assist from turning the key and pulling, bam the sled comes to life. the rope gets stuck in the primary and nearly takes me and another guy out but the sleds running! we kill it, get the rope out and start it back up with the key. she's running, just purrring like nothing ever happened! i let it run for a few minutes and take it for a spin, she running great again?? we pack up and climb out of the drainage and finish off the day going hard. the only other stumble was when i'd stop and start the sled it seemed to take a minute to clean out before i could hit the throttle, it'd act like it wasn't warmed up in the morning and you try and give it gas to get off the trailer and it'll hardly run, they've got some sort of engine protection sequence or something. anyway as long as i hesitated and let it idle a second it ran awesome the rest of the day...?
so now that i'm home i want to figured out what happened and why?? all i can figure is it over heated the sled and had some sort of vapor lock issue? or my fuel pump is starting to die?
thoughts/comments????
day 1
fan, worked excellent, we found some excellent deep powder over the hood type riding and i started to feel the dreaded bogs, flipped the switch on the fan few seconds later and it just seemed to clean out and purrrrr again!
day 2
hot seemed like mid 40's plus and sunny, snow was melting and we were riding in more or less long sleeve t shirts, beautiful. sled was running strong all morning lots of playing and hard riding just go, go, go. i started to feel it miss or slightly bog in the low end but it seemed to clean out at a little higher rpm. flipped the switch to the fan thinking things were hot and maybe a little more air flow would be a good thing.
anyhow we're down in this steep north facing drainage, again it feels like it's near 50 degrees, but the snow is still real nice and we're climbing and playing hard. the group decides to move to another area so we find a good route up and out. i'm following the group and all the sudden the sled bogs and stops dead mid hill. it's like it just ran out of fuel!! no bang, clank, smoke or anything. i grab for the the break and keep it from rolling, it's a pretty bad spot.
so i hit the key a few times and it will not start, i just it choke and it starts and runs for a second but really go and dies with the choke off? after a bit a buddy gets turned around and comes looking for me. we're able to get the sled turned around and coost it to the bottom of the drainage! and there i sit for the next 1.5 hours, pulling plugs, checking gas pumps, carbs, etc. nothing works i splash gas in the carbs and still nothing! to make things better i'm starting to get concerned about my battery!
so i'm dead in the water at the bottom of this huge drainage. i honestly don't know if we could pull the sled out! so i borrow a buddy's sled and bomb back to the truck for more tools and starting fluid. the only other time this has happened (which i posted about a few months ago) starting fluid worked and the sled ran great the rest of the day. so 1.5 hours later i'm back to the sled and spray down the carbs, hit the key, nothing! minutes later the battery is dieing and barely turns it over. yeehaw...
one last ditch effort before attempting to pull the sled. i rap a rope around the primary and attempt to pull start, 2, 3, 4, attempts then with assist from turning the key and pulling, bam the sled comes to life. the rope gets stuck in the primary and nearly takes me and another guy out but the sleds running! we kill it, get the rope out and start it back up with the key. she's running, just purrring like nothing ever happened! i let it run for a few minutes and take it for a spin, she running great again?? we pack up and climb out of the drainage and finish off the day going hard. the only other stumble was when i'd stop and start the sled it seemed to take a minute to clean out before i could hit the throttle, it'd act like it wasn't warmed up in the morning and you try and give it gas to get off the trailer and it'll hardly run, they've got some sort of engine protection sequence or something. anyway as long as i hesitated and let it idle a second it ran awesome the rest of the day...?
so now that i'm home i want to figured out what happened and why?? all i can figure is it over heated the sled and had some sort of vapor lock issue? or my fuel pump is starting to die?
thoughts/comments????
Kachess
TY 4 Stroke Junkie
Man you have bad luck! Too wierd! Maybe fuel pumps. But when our's went it was only one of them so it would run on two cylinders. Did you pull off the lines in the field to see if they were pumping when you cranked?? When our's crapped out we could only get them going again by priming them. We had to suck on the fuel line. When I first started having issues with the pumps it was on warm days so I figured it was some sort of vapor lock issue. I think they just start to get weak, and heat and hard pulling lets them loose their prime. When I tested them in the garage, a good pump pumped much harder than the weak ones. it was easy to see they were bad by comparing them. Ghad. I'd be out shopping for an M8 if I were you.
freelheeler
Pro
yep pulled off the fuel pump hose (exit) and turned it over, fuel 'spit' out of both. it did seem weak at the time! however i have nothing to compare against? probably not a bad idea to just replace them both, although i'm sure they cost a good bit?!
crazy thing is i like the rx1? and when she runs well like this weekend it'll go where i don't need it to. the rejetting, cleaing and fan seem to be the ticket. rode a bubby's mm700 stock back to the truck and the real difference is the 'power band' where as the rx1 just pulls the 2 strokes hits. plus the lack of oil man a couple of days riding with 2 smoke gets to a guys head.
saw some crazy lines out in the hills of cooke city, people are really stick'n it out there. plus saw a few boosted sleds not sure i've got the 'balls'?
m8????? the local yamaha dealer has a new 07 apex $6500-
crazy thing is i like the rx1? and when she runs well like this weekend it'll go where i don't need it to. the rejetting, cleaing and fan seem to be the ticket. rode a bubby's mm700 stock back to the truck and the real difference is the 'power band' where as the rx1 just pulls the 2 strokes hits. plus the lack of oil man a couple of days riding with 2 smoke gets to a guys head.
saw some crazy lines out in the hills of cooke city, people are really stick'n it out there. plus saw a few boosted sleds not sure i've got the 'balls'?
m8????? the local yamaha dealer has a new 07 apex $6500-
freelheeler
Pro
sled seems to be running well.
another ongoing question, fuel consumption or MPG. i'm getting around 55-60 miles per tank, riding hard. the other weekend we rode 30 miles of trail (one way) and put on another 50 riding for a total of a 107 mile day. yes took extra fuel and cached it, 7 gallons and needed just about every drop. although the other sleds in the group needed some fuel it appeared i was the largest consumer.
i've got the 162x16x2.5 camo extreme which is a large track to run on the road so maybe fuel consumption is just another trade off? i tend to back out the shockwave in order to lower rpms on trails but it doesn't seem to affect MPG??
another ongoing question, fuel consumption or MPG. i'm getting around 55-60 miles per tank, riding hard. the other weekend we rode 30 miles of trail (one way) and put on another 50 riding for a total of a 107 mile day. yes took extra fuel and cached it, 7 gallons and needed just about every drop. although the other sleds in the group needed some fuel it appeared i was the largest consumer.
i've got the 162x16x2.5 camo extreme which is a large track to run on the road so maybe fuel consumption is just another trade off? i tend to back out the shockwave in order to lower rpms on trails but it doesn't seem to affect MPG??
ski-bum
Expert
Several years ago we had a similar situation where several rx1's in our group died in the same place after a long high altitude climb on a warm day. We were not able to restart them immediately, but after letting them sit for a short time they fired up with the throttle depressed and cleared out. I had carb heat shut off on mine, but the others didn't. The one thing I recall about all three was that I cracked the gas caps and there was a whoosh of air as if the tanks were pressurized.
All of the sleds were set up a little different as far as jetting, carb heat shutoff, float bowl updates, etc. so I rememmber being confounded that this could happen to all the sleds at the same time. I'll see if my original thread is still on here and post a link if I can find it. May give you guys some clues so you can piece it together.
All of the sleds were set up a little different as far as jetting, carb heat shutoff, float bowl updates, etc. so I rememmber being confounded that this could happen to all the sleds at the same time. I'll see if my original thread is still on here and post a link if I can find it. May give you guys some clues so you can piece it together.
ski-bum
Expert
Here is the link to my original post with some interesting input by others. Sounds very similar to your experience, even down to the temp.
http://www.ty4stroke.com/viewtopic.php? ... highlight=
Hope you can figure it out, because I never did.
http://www.ty4stroke.com/viewtopic.php? ... highlight=
Hope you can figure it out, because I never did.
