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post #41 of 92 (permalink) Old 09-30-2019 Thread Starter
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ok how much further with threading crankcase, 1 whole revolution?
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how are things going with it ??? got any more pictures???

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Re: uberscoot 2x50cc

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ok how much further with threading crankcase, 1 whole revolution?
You mean cranksnout?....Seeings 10* is roughly 1/8" alls you need to do is turn the threading die only an extra 1/8" to get the advance..

You can also use a tap to to the flywheel too....Remember its a very-very smsll teeny tiny amount needed...........


AlGores gonna ave brain stew after finding out that even the most heavily equipped EPA engines can be modified to deliver the power we pay for and then some.........LOL
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post #44 of 92 (permalink) Old 09-30-2019 Thread Starter
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here is cylinder, have new one coming in mail
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that one looks ok you might as well use it up 🙂 but that gasket looks glued lol you might have to go to the next level in gasket removal

https://www.walmart.com/ip/Tapered-B...caAl8CEALw_wcB

https://www.walmart.com/ip/2-Roloc-D...ll&athena=true

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Last edited by MrKitty; 09-30-2019 at 11:45 PM.
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post #46 of 92 (permalink) Old 10-01-2019 Thread Starter
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got gasket off, gasket maker on both sides, but couldnt put cylinder in past the piston rings, i pinched and rotated them simultaneously to try and sit them inside?
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Re: uberscoot 2x50cc

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got gasket off, gasket maker on both sides, but couldnt put cylinder in past the piston rings, i pinched and rotated them simultaneously to try and sit them inside?
The way that cylinder looks it looks like your engine was on the brink of dying anyway....Looking at all the blow-by staining on the transferports and intake port tells me that engine was on borrowed time..

Ill even wager that piston has a black or brown stain on the underside of the piston too...….You can see the problem was with the fuel mix also the tuning was the culprit as that engine ran on the hot side an aweful lot...…...

I know you said that you were getting a new cylinder but right now what you need to do first is fully decarbonize the cylinder dome and also the piston top then remove the piston rings from the piston and bolt down the cylinder to the base then carefully rotate the crank to see if the piston now strikes the dome at TDC which could be an issue for you...…

Sounds like how you are describing trying the set the cylinder again you don't have the rings oriented correctly as there are locator pins set in the piston grooves that orient the rings aswell as stop the rings from rotating...….

My restrictor plate on my 49cc EPA engine was casted into the crankcase....Yours was added and glued down heavily to thwart removal so hopefully the cylinder has a super-huge squishband now or youre gonna have to use thick gaskets to stop the interference between the piston and the dome or get another plate then modify it......... ....

Another option is getting a 49cc topend kit that doesn't have split transfers

When you buy the new topend kit buy a new coil too...…They go hand in hand….

Good Luck

Last edited by CAM2; 10-01-2019 at 08:50 AM.
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more then likely its his exhaust system to blame those bicycle exhaust systems are way too restricted its not leting the carbon or the heat leave the engine on top of running it on a bad tune...

the rings are indexed with a tiny pin to keep them from spinning then geting snaged in the transfers you have to line the ring gap up with the pin or the cylinder wont go on.

I will take a picture when I get home

you need to cleen all of the black stuff off the top of your piston using a 3M green dish scrubber then try to clean the top of the cylinder as well what i do is put the spark plug back in then flip it over spray about a quarter of an inch of carburetor cleaner into the top of the cylinder let it soak for about 30 to 45 minutes making sure that the carburetor cleaner doesn't evaporate you might have to keep adding some then I stuff the green dish scrubber up in there and try to use the handle on the dish brush to clean it out then I pop it into the dishwasher...

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Re: uberscoot 2x50cc

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more then likely its his exhaust system to blame those bicycle exhaust systems are way too restricted its not leting the carbon or the heat leave the engine on top of running it on a bad tune...

the rings are indexed with a tiny pin to keep them from spinning then geting snaged in the transfers you have to line the ring gap up with the pin or the cylinder wont go on.

I will take a picture when I get home

you need to cleen all of the black stuff off the top of your piston using a 3M green dish scrubber then try to clean the top of the cylinder as well what I do is put the spark plug back in then flip it over spray about a quarter of an inch of carburetor cleaner into the top of the cylinder let it soak for about 30 to 45 minutes making sure that the carburetor cleaner doesn't evaporate you might have to keep adding some then I stuff the green dish scrubber up in there and try to use the handle on the dish brush to clean it out then I pop it into the dishwasher...
He doesn't have to clean it squeaky clean..he just needs the layers of carbon removed so he can calculate proper squish and make sure the piston doesn't hit the dome after removing that restrictor plate seeings he stated he's getting a new topend kit in the mail.....

Those old rings are gonna be too rubbery and toasted to reuse looking at all the internal blowby on the intake n transferports...

If anything he added to the stress of the engine by uncorking the exhaust and not having a carb he can adjust most likely aswell.

That's how I found my restrictors after I still couldn't go faster than 18mph even after gutting the box muffler and adding an adjustable pumper carb modded to almost 18mms to tune it in better and only got 21mph.....

It kept hitting a wall that limited it harshly so I popped the cylinder to see what the deal was and found out first hand...

Now it cruises at a nice 31-32mph with enough mondo torque to lift the front wheel with ease by removing all obstructions,polishing and modding a few things and putting brand new piston rings..

My gutted box muffler actually worked alot better than an exhaust the pipe program said would work with the porting too...LOL

With opensided transferports it's harder to get a tuned exhaust to work when theres no actual sealed cylinder to totally be in control of the transferport bleed-down that takes place with-in while building compression...
.
That bike exhaust has negligible negative effects on his engine compared to the chambered and restricted box muffler with a 10mm outlet and a spark arrestor screen that comes on it....

The restrictor plate doesn't allow the cylinder to fill and scavenge correctly at high rpms creating a bottleneck obstruction to where it causes the engine to scavenge back more spent exhaust than it should......

Last edited by CAM2; 10-01-2019 at 03:33 PM.
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post #50 of 92 (permalink) Old 10-01-2019 Thread Starter
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so removal of the gaskets might create head knockers, do i gasket up the spark plug? if so where i find them and r they called spark plug gappers or spark plug gasket?
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Re: uberscoot 2x50cc

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so removal of the gaskets might create head knockers, do i gasket up the spark plug? if so where i find them and r they called spark plug gappers or spark plug gasket?

Like I stated you need to see if the piston is going to strike the dome now before the new topend gets there and you find out you'll need a few basegaskets to make the magic happen or not which will cause this project to linger further into the future unless you're cool with it and surprises to go with it...

Last edited by CAM2; 10-01-2019 at 03:38 PM.
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defentley put it together now and check the squish as Cam2 has advised
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post #53 of 92 (permalink) Old 10-05-2019 Thread Starter
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i think its running good but now going to have to bore out muffler holes and put old muffler back on but need next size up drill bit and tap set. i know to drill hole and take baffle out but what does baffle look like
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Re: uberscoot 2x50cc

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i think its running good but now going to have to bore out muffler holes and put old muffler back on but need next size up drill bit and tap set. i know to drill hole and take baffle out but what does baffle look like
The baffle is a metal divider with tiny holes that divides the box muffler into sections.......

Its literally crimped into the box muffler when the two halves are bonded together...…...It can be seen through the flange hole...

What I do is use a metal rod through the outputhole to break the tube that sits like 1-2" inside the box off then through the flange hole you drill a series of small holes in it so you can grab the baffle with a pair of needle nose pliers and twist rip it out like you're opening a spam can with the supplied metal key................


Last edited by CAM2; 10-06-2019 at 08:17 AM.
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post #55 of 92 (permalink) Old 10-10-2019 Thread Starter
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do i take this gasket in picture off and yamabond it too i forgot about this one?
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Re: uberscoot 2x50cc

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do i take this gasket in picture off and yamabond it too i forgot about this one?
No you put a new gasket there...
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post #57 of 92 (permalink) Old 10-11-2019 Thread Starter
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so i think my squish is good, no weird metal to ketal sound... i checked by rotating crankcase, is that how u check?
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Re: uberscoot 2x50cc

Looks like you have a 42.7mm bore cause the intake has 4 bolts, the 49cc is 44mm bore with 2 bolt intake, so I would check the cyld bore size first. I bought one of those engines a few years ago, but I bought a new 44mm bore cyld and piston kit.. $20 or so.
I could not find a 42.7mm piston or cyld at pocket bike parts stores.
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post #59 of 92 (permalink) Old 10-11-2019 Thread Starter
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****....i need a caliper for cylinder size right? if i dont hear anything different with the engine is it fine? i dont hear any knocking?
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Re: uberscoot 2x50cc

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so i think my squish is good, no weird metal to ketal sound... i checked by rotating crankcase, is that how u check?
No you need 5/32" rosin core silder and through the sparkplug hole you squish the solder then measure the squish point with a digital caliper..

If your squish is tighter than .040" youre gonna need higher than norml octane fuel from 95-100 octane to keep it running optimal and tuneable...








Last edited by CAM2; 10-11-2019 at 04:30 PM.
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