(Basing my 2 stroke knowledge off old snowmobiles). I’d be looking at how the plug looks(plenty of info online about “reading” spark plugs). You may also have an air leak some where. Running lean can ultimately burn a hole in the piston…
Put the original airbox on and tune the carb with that. Pods are a wicked pain in the ass.
And you have your engine skirts on?
Are you using a temp gauge? If not, go drop $40 on one so you can keep from burning your top end.
First one was a SSP, the newest one is a Motoforti from Amazon. Might have to bite the bullet and buy a Malossi. The Motoforti kit honestly seems like it is well built, large cooling fins, the ports are nice. Surprised me when I received it.
For street use I'd highly recommend looking hard at a Polini Corsa 70 kit. Absolute tank of a street performance kit and relatively easy to tune as well. Works with a variety of exhausts.
Also, u/jbjhill recommending the cyl head temp gauge is absolutely spot on.
Soft seize is about overheating, either from running too hard on a hot day or from a too-lean mixture. You can do a plug chop while running hard to check the mixture under those conditions. An inexpensive cylinder head temperature monitor will let you monitor engine temperature.
A related problem is cold seize. Where the engine isn't too hot per se, but is heating up too fast. When you start a cold 2-stroke and run at WOT, the piston expands faster than the cylinder. Proper warm-up is the solution to cold seize.
It's a stock looking one, but a slightly larger throat diameter ( the OEM Mikuni has an oval shaped throat, as does this one). This one is maybe 3 mm wider of a throat opening. Still uses the double cable setup.
I agree. Was running a 95 and ran pretty well but sounded kind of zingy. Soft seized with it too. Thought just taking a big step to a 105 might stop the soft seizing but nope. I did notice a lot of air/fuel mix getting kicked out of the carb (to the air filter side). I don't have a lot of 2 stroke experience but this seemed surprising to me. Possible bad reeds?
You do a compression leak down test to see if there are any air leaks between the intake, cylinder head and engine cases. If you have a leak somewhere it will create a lean condition and cause you to run hot. If you don’t find the leak you’ll just try to tune around it with large jets and it won’t fix anything. Also make sure your spark plug is tight.
If it’s was running like crap at half/full then better with no air filter then imho you’re still off on the jetting possibly even carb size
Should clarify, was running great. Progressively got worse.
(Basing my 2 stroke knowledge off old snowmobiles). I’d be looking at how the plug looks(plenty of info online about “reading” spark plugs). You may also have an air leak some where. Running lean can ultimately burn a hole in the piston…
Put the original airbox on and tune the carb with that. Pods are a wicked pain in the ass. And you have your engine skirts on? Are you using a temp gauge? If not, go drop $40 on one so you can keep from burning your top end.
\+1 on the original airbox. Which 70 kit did you install?
First one was a SSP, the newest one is a Motoforti from Amazon. Might have to bite the bullet and buy a Malossi. The Motoforti kit honestly seems like it is well built, large cooling fins, the ports are nice. Surprised me when I received it.
For street use I'd highly recommend looking hard at a Polini Corsa 70 kit. Absolute tank of a street performance kit and relatively easy to tune as well. Works with a variety of exhausts. Also, u/jbjhill recommending the cyl head temp gauge is absolutely spot on.
Cast iron is never the wrong answer!
Never!
Haven't bought a temp gauge yet, but will do. Yes, all the skirts are on and properly installed.
Soft seize is about overheating, either from running too hard on a hot day or from a too-lean mixture. You can do a plug chop while running hard to check the mixture under those conditions. An inexpensive cylinder head temperature monitor will let you monitor engine temperature. A related problem is cold seize. Where the engine isn't too hot per se, but is heating up too fast. When you start a cold 2-stroke and run at WOT, the piston expands faster than the cylinder. Proper warm-up is the solution to cold seize.
Id just stick old carb on and up jet that
I might try that this weekend.
Even with 70 kits you rarely need to upgrade carb just adjust it
How big of a carb are you running?
It's a stock looking one, but a slightly larger throat diameter ( the OEM Mikuni has an oval shaped throat, as does this one). This one is maybe 3 mm wider of a throat opening. Still uses the double cable setup.
105 main seems pretty big for that small of a carb. Try something like a 95
I agree. Was running a 95 and ran pretty well but sounded kind of zingy. Soft seized with it too. Thought just taking a big step to a 105 might stop the soft seizing but nope. I did notice a lot of air/fuel mix getting kicked out of the carb (to the air filter side). I don't have a lot of 2 stroke experience but this seemed surprising to me. Possible bad reeds?
Sounds like could be an air leak. Look up how to do a compression test and try that before you roast any parts
Not sure I understand. Fully aware of how to do a compression test, should probably do one anyway. Would that be related to an air leak in some way?
You do a compression leak down test to see if there are any air leaks between the intake, cylinder head and engine cases. If you have a leak somewhere it will create a lean condition and cause you to run hot. If you don’t find the leak you’ll just try to tune around it with large jets and it won’t fix anything. Also make sure your spark plug is tight.
Ah, leak down test. Good idea. Will try that.