skiroule, just throwing some easy ideas to eliminate the obvious and diagnose where the real issue may lie without first tearing into or down something you may not have to, at my shop I am always doing pressure/vac tests on 2 stroke and 4 mix engines not only to determine a cause but to prevent repeat failures as there is always a cause for every effect and sometimes the cause is not so obvious, I have a box full of rubber wedges and block off plates and I hear ya about these and being sure for proper fit. compression like you said 135 not perfect but it is a 45 year old engine, that seal design is definitely an easy fix without major tear down. I just worked on a mud buddy engine in a duck boat , it was a briggs engine that someone had purchased a Mikuni carb kit for, the customer had installed it, couldn't get it running right, would spit back through the carb, idle was unstable and the transition between idle and acceleration really lacked luster, the mikuni kit came with an intake boot same as an older style intake boot on a snowmobile. It had the molded o-ring on backside which was meant to seal when the boot was tightened to manifold but when you would tighten it down it wouldnt seal against manifold, it would warp and leak in the middle of the boot. I thought before I had found this that maybe there was some jetting that had to be done. I ended up carefully taking a razor blade removing sealing ring from behind boot so it would fully sit flat against manifold, remounting it and using Rite-stuff sealant between boot and manifold and problem solved. Sorry to get long winded, there is always a cause for every effect and some are always not so obvious and can be easily overlooked, by some simple tests which don't involve a lot of tear down, the obvious can be eliminated and the true problem can be determined. When people come into my shop and want to order a part that I feel they are doing so based on an assumption or a hope that I will be an instant fix I always question and help to determine that they truly need what they think they need. Hope I was able to help you and am anxiously awaiting the result.
Polaris Mutt Mod
- Thread starter skiroule
- Start date
skiroule
Well-known member
I really appreciate your throwing out ideas, you've dealt with more two-stroke engines than most see in a lifetime. I think i'm guilty of being one of those people that would be coming in, looking for an instant fix.
It's interesting that you mention the boot because that is exactly the type of boots that are on it. I don't think it would take much of a boot leak to really mess up the fuel ratio. If the new seal doesn't change things, that will be my next move. I just can't think of anything else that would be leaning out the fuel ratio on that cylinder. I have some older style boots that came with the used carbs and maybe some others lying around that could maybe be used to swap it out. It's a long shot but then, so is the seal.
It's interesting that you mention the boot because that is exactly the type of boots that are on it. I don't think it would take much of a boot leak to really mess up the fuel ratio. If the new seal doesn't change things, that will be my next move. I just can't think of anything else that would be leaning out the fuel ratio on that cylinder. I have some older style boots that came with the used carbs and maybe some others lying around that could maybe be used to swap it out. It's a long shot but then, so is the seal.
the only other thing outside of everything else would be damage around the intake or transfer ports will directly affect idle but that would be last resortI really appreciate your throwing out ideas, you've dealt with more two-stroke engines than most see in a lifetime. I think i'm guilty of being one of those people that would be coming in, looking for an instant fix.
It's interesting that you mention the boot because that is exactly the type of boots that are on it. I don't think it would take much of a boot leak to really mess up the fuel ratio. If the new seal doesn't change things, that will be my next move. I just can't think of anything else that would be leaning out the fuel ratio on that cylinder. I have some older style boots that came with the used carbs and maybe some others lying around that could maybe be used to swap it out. It's a long shot but then, so is the seal.
skiroule
Well-known member
Well, the Mutt has finally learned to bark.' Like garageguy said, it might be a tippy little screamer yet.
Put everything back together and the seal wasn’t the issue, just as euphoric1 suspected that it probably wasn’t. But his story about the warped carb boot prompted me to pull the boot. I could see that there was fuel residue outside the built-in O-ring (there shouldn’t be). Luckily, I had various boots lying around and I found one that would fit.
Yep, turned out to be the friggin’ brand-new carb boot. Have to decide if I just want to leave the boot I put on or replace it but at least I can now think about moving on. It sounds pretty good.
It’s looking like I might have to find a longer belt. I have the chain case adjusted all the way forward and the belt still seems too tight and it probably will creep at idle.
Put everything back together and the seal wasn’t the issue, just as euphoric1 suspected that it probably wasn’t. But his story about the warped carb boot prompted me to pull the boot. I could see that there was fuel residue outside the built-in O-ring (there shouldn’t be). Luckily, I had various boots lying around and I found one that would fit.
Yep, turned out to be the friggin’ brand-new carb boot. Have to decide if I just want to leave the boot I put on or replace it but at least I can now think about moving on. It sounds pretty good.
It’s looking like I might have to find a longer belt. I have the chain case adjusted all the way forward and the belt still seems too tight and it probably will creep at idle.
Seriously though glad you got it figured out!
skiroule
Well-known member
LOL, I suspect that at times, trying to follow this thread is like watching paint dry. Not much is happening.
Soft water fishing is done for the season and we’ll be moving back to the house full-time next week so maybe that will help with the progress.
I did just order hood decals and headlights so at least I’m thinking about getting at the hood.
Most of my spare time over the last 6 weeks has been spent fortifying the foundation on the front of the cabin (almost done!). Much of it is typically under water and with no breakwater to protect it, years of waves and wakes had started to gnaw away at the seam between the foundation and the bedrock. With the lake level being low, I had to take advantage of the opportunity to repair it.
I added more concrete all along the base but first I had to build a work path out of rock and crushed rock. It would have been impossible to work from the sloped, underwater snot-slick bedrock. I hauled all the concrete and rock down to the front of the building by hand (there is no access to the front for a vehicle). I’m no spring chicken so this was a workout for me.
The path might be a sufficient breakwater to protect most of the repaired seam but I plan use it as a base to build a higher breakwater this winter when I can haul larger rocks via snowmobile. I’ll finish the painting next year.
Ski,
That may be a cabin in Minnesota, but it's called a second home here in Wisconsin. Very nice!
skiroule
Well-known member
Funny stuff Gary. It's come a long way since we bought it 10 years ago but I seem to be on a 50 year improvement program. If you think my sled work is slow......
pclark
Well-known member
I feel your pain Skiroule, hauling rocks and concrete is a ballbuster, take the rest of the fall off and enjoy the winter!
Jim, all I have to say is WOW!!!! let me see... Pleasant Prairie or....Cisco Chain?? Hmmmmm Holy crap Jim! Beautiful place!!!! And that view...WOW!
pclark
Well-known member
I guess so, looks good!
goofy600
Well-known member
Cisco chain, on longer in PP.
I know, just sayin that couldn't have been a tough decision to make
skiroule
Well-known member
Beautiful! In my opinion, this is what a dream home looks like. Your hard work is paying off.
skiroule
Well-known member
Not something to be concerned about at all. I really enjoy it when people share some of their experiences and accomplishments and believe me, your place is an accomplishment. I keep looking at your photo and thinking about what it must be like to sit out on that deck on a nice day/evening. Then there is the matter of the rock
I have neglected the fishing somewhat this summer myself. It's good when friends and family come up to fish because it makes me get my priorities back in order and take the time to really focus on fishing.
skiroule
Well-known member
I been working on a sled trailer, hoping to get it ready to sell before the snow flies but guess I missed that deadline. A little wet snow today and more to come over the next day or so.
Anyway, I figured I better show some sign of life on the project. It occurred to me that I hadn’t test-fit the hood since it was painted and the under-hood stuff was mostly finished. The side emblems were ready to install so I stuck those on before seeing how the hood fit. Everything clears so I think it’s good to go.
Not a huge update but it does provide a small glimpse of the end-goal. Interesting looking little sled, a one-year-only model design from Polaris.
Anyway, I figured I better show some sign of life on the project. It occurred to me that I hadn’t test-fit the hood since it was painted and the under-hood stuff was mostly finished. The side emblems were ready to install so I stuck those on before seeing how the hood fit. Everything clears so I think it’s good to go.
Not a huge update but it does provide a small glimpse of the end-goal. Interesting looking little sled, a one-year-only model design from Polaris.