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Post by Florida Antique on Apr 20, 2015 12:03:24 GMT -5
Did you put the part between the case and the carb back in before you did the compression test. That should have been the reed block and if there is anything wrong with that it will definitely cause it not to start. If a reed was broken or missing, I think that will cause low compression too but Dave or Brent would have to back me up on that one.
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Post by lonewolfncubs on Apr 20, 2015 15:20:39 GMT -5
Well I removed both head and piston( which I bought new )and reinstalled old piston with the new head and compression went up But clearly still no where near it should be, so I removed new head and put on old head....... Compression went down a tad but pretty much the same, Florida Antique Yes I did have everything together, carb and valve reed both bolted back on the case, and air box still attached to carb as well. Anything else I should be looking for that can contribute to compression?
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Post by lonewolfncubs on Apr 20, 2015 15:47:14 GMT -5
Just showing everything is bolted back where it suppose to be I wish I can just go to L.A. So I can drop this scoot off with Dave and maybe I wouldn't have such a headache over this
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Post by Florida Antique on Apr 20, 2015 20:43:26 GMT -5
When you did the compression test did you open the throttle up wide open? If the slide is down on the carb it will show a lower compression. Other than that, I really don't know why your compression is low. You can put a couple of squirts of oil in the cylinder and see if the compression goes way up. If it does then it is a ring problem. Once you get the compression thing figured out, you should have it running.
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Post by 90GTVert on Apr 21, 2015 6:41:52 GMT -5
I'm still suspicious of a sealing issue or other issue with the tester. I switched out the rubber o-ring on one of mine and instead used a washer from a spark plug and that worked better for me.
If you indeed have 30-60psi compression the engine should turn over very easily even with the plug in... hardly any effort.
Compression we are referring to is secondary compression, what happens in the cylinder above the piston. Primary compression in a 2T is what goes on in the cases, below the piston, and not something you're worried about here or what you're testing. For the compression tests you're doing it matters not if you did indeed have the reeds out.
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Post by niz76 on Apr 21, 2015 9:40:21 GMT -5
On my compression tester the threads for the 14mm (2t) are way too long and I'm constantly trying to keep it sealed good with o-rings to get an accurate reading like Brent mentioned...
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Post by spaz12 on Sept 29, 2015 2:48:07 GMT -5
Well I removed both head and piston( which I bought new )and reinstalled old piston with the new head and compression went up But clearly still no where near it should be, so I removed new head and put on old head....... Compression went down a tad but pretty much the same, Florida Antique Yes I did have everything together, carb and valve reed both bolted back on the case, and air box still attached to carb as well. Anything else I should be looking for that can contribute to compression? Before I zoomed in on this picture I knew without a single doubt that you would have 60 psi on that Harbor Junk compression tester. Go to an auto parts store and borrow one from them with the correct adapter. It should have the right one... And I also believe that for every foot of hose, you should add 10 psi (?) to the total. Another question, exactly what plug are you using? If you stated it, I completely missed it and apologize. Where the stator is mounted on that motor...Is it adjustable? Have the mounting holes been elongated? Has the stator assembly worked itself loose? I'm wondering about your timing. I believe that you are getting all that fuel and oil down in the crankcase when you are severely restricting your carburetor. Your pulling a lot of vacuum but the only thing it has to draw in is fuel/oil mix because the carb throat is plugged off. I understand your reasoning in doing so, but your issue is elsewhere. Like, the size of your pilot jet? I don't remember anyone mentioning jet sizes. I'll reread your post, but these are just a few of the things that I can think of. They are just thoughts for now though as I was not paying a whole lot of attention while reading it this first time.
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Post by spaz12 on Sept 29, 2015 3:10:36 GMT -5
The reason I asked if your stator assembly is adjustable is because Niz, in his first response to your post included a link to scrappy dogs. I had clicked on it out of curiosity and remembered thinking that you had a weird stator... Does yours look like this? If so, it looks adjustable. Hopefully it has degree marks somewhere so that you can set it correctly.
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Post by spaz12 on Sept 29, 2015 3:12:43 GMT -5
Again, thanks you guys, it finally turned on! What I did was take it outside and remove the exhaust pipe and put my motorcycle muffler over the port and turn it on, and I did use a sock and covered the carb and it cranked over, at first it was high rpm then it started to idle lower then I put the oem muffler back on and it would not turn over, removed it again and turn on, all lights work, signal relay works, throttle works! So is there something I can do to this muffler or do I end up having to buy another muffler? oh I even put back the filter and it still turned on! This makes me think that your pilot that you currently running is too large. Why? because it started with an unrestricted air filtered and basically a performance pipe (WAY unrestricted!). Right now you are running a restricted air box and restricted pipe. This is probably your biggest problem. Maybe your only problem. I'm just trying to discover problems as I go back through your thread, so I might make several posts. Do forgive me
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Post by spaz12 on Sept 29, 2015 3:34:20 GMT -5
This post right here it seems like you are still using the unrestricted air filter that you had on earlier? At this point you have not installed the stock air box? And it still started with no complaints? Further points me to jetting... Hell, maybe you can just use the air filter you had before?? That would be nice, though I suspect it wont be perfect and that you'll still need to fine tune (jetting), which, if you have to buy jets, then you should really buy them for the stock air box since they are less susceptible to weather changes.
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Post by spaz12 on Sept 29, 2015 3:47:32 GMT -5
Thanks guys, I washed the filter with dawn and dried it, cleaned the filter housing down and installed the housing to the scoot, funny thing is I still had to remove the snorkel hose and suffocate the carb for it to start, and even that was extremely hard to get it started, I bought PWC two stroke low smoke full synthetic oil but have not put it in the scoot, bought it at walmart for a out $15 a quart! It's was meant for boats cause it said marine two stroke, wasn't sure if I should use it on my scoot, also bought mobile 1 10w30 for drivetrain, will update with pictures soon..... In this post you installed the restricted air box and started experiencing starting problems (again). I can almost certainly say that your problem is a jetting issue. That if you remove the stock air box and replace it with your other filter it should run. Running good is another story altogether. From here I'm not sure where to point you... I would however recommend you to jet for the stock air box. But with that carb I'm not sure what jets would be a good starting point since I don't know much about it. Anyway, start with a new plug, make sure there's fuel in the bowl and see if she'll start with the other air filter back on it. Decide from there. Cheers
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Post by lonewolfncubs on Sept 29, 2015 12:25:59 GMT -5
Thanks spaz12, it's funny, I have not been on this website in months. My nephew recently been leaving the new scooter unlocked when he gets home after numerous warnings I have giving him and last week someone stole it I was furious, so he does not want to invest on another scooter, especially when the colder months are coming, so we are looking for a little beater for now so he can get use to driving and be able to afford a better vehicle. And while I'm looking for this beater, I'm also looking for the SOB (who had the nerve to step into my property and steal something of mine) to be a real idiot and drive around with the scooter in this town so I can catch a domestic charge, good thing I had the scooter title and report it to the police in hopes of they catching him. Anyways when I bought this old scooter, it was in pieces, even the head and piston was removed from the engine. so when I got it home, I never put the old parts together, cause the old carb looked in bad shape, so since I had to wait for the carb to do anything else, and since the other parts were cheap as well, I had might as well buy the other new parts. So after all this nonsense I dealt with trying to get this scooter working, I failed to use the old piston and head. So after I checked compression, from the new piston and head, it had low compression, when I put the old piston and head back on, it had better compression, so further inspection of the new ring I had noticed the piston ring was fully inside the grooves and the piston had rub on one side of it. So using common sense I think that 2 full minutes of trying t crank her up for her to finally start was the engine building compression. So when I put everything back together with the old head and piston and the new carb and cranked her up, IT TURNED ON INSTANTLY so I had her running for a few and turned her off and let her sit for a while and turn her on again and once again turned on instantly, so my conclusion is I guess when I originally installed the new piston in the opposite direction, it was rubbing on the side wall too much and damaged the rings/piston I have not taken it out for a spin due to heavy rain these last few days
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Post by Fox on Sept 29, 2015 13:38:07 GMT -5
Glad you finally got it running. Two stroke pistons have an arrow on top that always points toward the exhaust port of the cylinder or in your case toward the front of the scooter.
My advice to you:
Sell that thing for as much as you can and get a scooter with a 1E40QMB 2 stroke engine or a 139QMB 4 stroke engine. Either one is going to out perform that scooter you have there and they are much better quality and ease of maint.
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Post by spaz12 on Sept 29, 2015 13:52:03 GMT -5
I've had enough scooters stolen from me that I can sure understand the anger. It's super frustrating. Anyway, glad that you got that one running and that your nephew will have something to ride.
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ceeja
Scoot Member
Posts: 57
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Post by ceeja on Sept 29, 2015 23:49:06 GMT -5
that arrow on the top sort of gets, covered, with black soot after a little bit of riding, that points towards the exhaust. you gotta get used to which direction the piston goes in, which direction everytime you put it on.
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