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Unread 03-03-2015, 05:33 AM   #21
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Default Re: Spirit 340 Install Woes

I'm thinking it is the carburetor that's the problem... When I first ran it, there was no air filter. I know for a fact that the plug wires aren't switched, and I don't think anything's wrong with the valves... With your 500, do you know if the internal ports are symmetrical or asymmetrical? And as for the exhaust, what did you use? I butchered an old soccer goal for 90 bends and short straight pieces, then used the exhaust manifolds from an old Kholer motor I found at my local dump (the closest thing to a scrap yard within 20 miles or so, which is nice, because my Cherokee's ignition completely died on me last saturday), and it seemed to work just fine.
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Unread 03-03-2015, 06:44 PM   #22
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Default Re: Spirit 340 Install Woes

Just a thought: if the engine has for whatever reason been comprimised, what would you recommend for a replacement? And should I bother with trying to get essentially a 4X4 ATV chassis crudely thrown under it, or should I wait until I have more time/money/a better equipped place to do so?
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Unread 03-03-2015, 07:11 PM   #23
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Default Re: Spirit 340 Install Woes

These have no valves.
If it ran before, you've likely messed up a piston direction, snagged a ring, got a massive gasket leak.
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Unread 03-03-2015, 10:30 PM   #24
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Default Re: Spirit 340 Install Woes

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Originally Posted by TheGDFP View Post
These have no valves.
If it ran before, you've likely messed up a piston direction, snagged a ring, got a massive gasket leak.
Every 2 stroke atv/sled/jet ski engine that I have ever messed with has had valves, They are completely different then 4 stroke valves, but valves none the less, they are located in between the carbs and jugs. Some people call them reeds, some call them valves, I call them valves. This is one of them things I love to hear, just like someone telling me that they had a power band put in. Most of these valves can be turned around and still work, but I have seen some that can't. the ones in the pic are from a Polaris 350 2 stroke
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File Type: jpg reed valves.jpg (103.8 KB, 0 views)
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Unread 03-03-2015, 11:05 PM   #25
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Default Re: Spirit 340 Install Woes

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Originally Posted by Baseless View Post
Just a thought: if the engine has for whatever reason been comprimised, what would you recommend for a replacement? And should I bother with trying to get essentially a 4X4 ATV chassis crudely thrown under it, or should I wait until I have more time/money/a better equipped place to do so?
unless you are going to be doing some serious off roading, I'd stick with your build. Even if you did break a ring, you could replace the rings a lot cheaper then buying a running atv to put under your cart. I spent $400 to get my jugs bored, new piston kits with all the gaskets to put the engine back together. with yours, you might get away with just replacing the rings. I still not convinced that that is your problem. did your pistons have holes in the skirt that pointed towards the carbs? If so you can look to see when you take the carbs off to clean them or look through the exhaust port. You should be able to see if you have a broken ring this way too. Now for the exhaust, I tried to use the exhaust from a 400 single cylinder on my 500 twin, It ran, but not worth a darn. In fact, it ran better without it on. But if yours ran before, it should still run. If it was me, I'd stick with what you've got, do some looking into the jugs through the intake and exhaust ports, clean the carbs, check for spark and compression, all the simple things before tearing into the engine.
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Unread 03-04-2015, 05:45 AM   #26
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Default Re: Spirit 340 Install Woes

The spark seemed kinda weak when I checked it monday, and I don't believe I broke the rings... I'm going to take the carb apart to see what's what on the inside of it THIS time, then go from there. Should also have a few pics of it so far to upload, as well.

As for the ATV chassis, I know how I'd do it, but don't know what kind I'd use. Was just a nifty idea a friend threw my way yesterday.
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Unread 03-04-2015, 09:43 AM   #27
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Default Re: Spirit 340 Install Woes

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Originally Posted by knkyle View Post
Every 2 stroke atv/sled/jet ski engine that I have ever messed with has had valves, They are completely different then 4 stroke valves, but valves none the less, they are located in between the carbs and jugs. Some people call them reeds, some call them valves, I call them valves. This is one of them things I love to hear, just like someone telling me that they had a power band put in. Most of these valves can be turned around and still work, but I have seen some that can't. the ones in the pic are from a Polaris 350 2 stroke
LOFL. I'm pretty familiar with reed valves, and engines in general.
Google "piston port" ;)
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Unread 03-04-2015, 04:07 PM   #28
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Default Re: Spirit 340 Install Woes

SO! Tore the carb apart: was surprisingly clean. Looked into the exhaust ports: noticed that the piston ring gaps were visible, so I turned them around, and put the jugs on the RIGHT way. Was unable to tighten any of the hardware, as I ran out of time for the day. I should HOPEFULLY have it running by Friday, if not tomorrow. Also, here's some pics! I would have uploaded a pic of the ring gaps, but it didn't come out quite the way I had hoped...
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File Type: jpg WP_20150304_001.jpg (361.7 KB, 0 views)
File Type: jpg WP_20150304_004.jpg (369.7 KB, 0 views)
File Type: jpg WP_20150304_006.jpg (364.2 KB, 0 views)
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Unread 03-04-2015, 09:32 PM   #29
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Default Re: Spirit 340 Install Woes

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Originally Posted by TheGDFP View Post
LOFL. I'm pretty familiar with reed valves, and engines in general.
Google "piston port" ;)
I'm not familiar with any piston port atv type engine.
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Unread 03-05-2015, 08:09 AM   #30
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Default Re: Spirit 340 Install Woes

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Originally Posted by knkyle View Post
I'm not familiar with any piston port atv type engine.
Never heard of Polaris? 250/300 had no reeds.
THE JetSki original 400/440, also no reeds.
Lots of snowmobile engines, including the 340 Suzuki in this thread, also have none.
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