Honda Spree top end kit problems.

[fairlead]

I have recently purchased 3 stock 49 cc top end kits off ebay. Each time I've installed them, I've had good runners for about two weeks, and then while riding they seem to seize up. Waiting a few minutes, you can restart them and go again. Two of the three kits have failed, having the bottom ring go to pieces and embed/scratch the * out of the piston and cylinder. Someone has suggested ring gap clearance may be to blame? I also wonder if a light honing might be in order?

I hate to give up on the sprees if the part quality sucks this bad. Maybe I should be buying from elsewhere like Treatland?

[patthesoundguy]

Who are the kits from? Is it this one? http://www.ebay.com/itm/HONDA-NQ50-SPRE ... 93&vxp=mtr
I got one of those out of curiosity. No go. Checked ring gap on install all good. But the cylinder seems to not be parallel. The cylinder is smaller in part of it or seems to be. Im going to pick up the snap gauges I need to properly measure it. I could get a few min out of the cylinder before it got tight. I heat cycled tons and was easy on it to start break in but simply no good. I have a good stock cylinder on the motor now to try when Ihave the time.to ccompare. And if you were using the base gasket from the kit and diddnt cut it. The intake ports and boost port can't breathe at all as the gasket is a pump gasket or something. And the exhaust port was already raised a mm or 2 from the factory.

[patthesoundguy]

I was thinking of taking the cylinder with the piston to wall clearance specs to a machine shop and get them to properly measure and check the kit. Honing at home might not do much good if you dont know where to remove material and how much.

[fairlead]

Glad to see I'm not the only one. I have no machine shops available to me here. Keep me posted. This sucks and I hate to give up on Sprees altogether due to inferior parts. I don't trust the thing over 2 miles! Good to hear from ya Pat. How's things in the Maritimes?

[fairlead]

Btw, that is the kit, and I did spot the untrimmed gasket problem. Do you know of a better supplier, or is this all we have?

[Johnniespeed]

I also had the cheapie cylinder kit not last more than a week, I think it was the same one you used. I ended up using an oversize OEM Honda brand piston and having Metric Motorsports in Muskegon bore the cylinder to match the piston with .0015" clearance. They do great work and cheap. I found the piston in the Netherlands, may have been the last one they had.

[paulpauly7]

the cheap cylinders need a light hone and the ports chamfered befor you install them .

[patthesoundguy]

the cheap cylinders need a light hone and the ports chamfered befor you install them .

I did that on mine before install. Maybe if Ihad measured it before hand and honed it out more where it was tight. Chop chop aka taz here on the board has quality stock size kits. He has a great supplier for his bbkits and I'msure the stock kits come from the same place. He only sells good stuff. http://www.ebay.com/itm/HONDA-NQ50-SPRE ... 4948&rt=nc

[patthesoundguy]

This eBay seller started selling these spree kits in the past little while. It says stock size but if the kit truley is the one in the pic it looks like the big bore kit the way the ports are an how thin the skirt is on the bottom of the cylinder where it goes in the block. I may order one to check it out.

[fairlead]

I hear there's a video on youtube detailing the port chamfering. My friend who has blown up 2 of the junk top end kits called the seller, who him-hawed around whether we even bought from him, and then said to send us a photo of the failed bottom ring (in all 3 cases) Never heard back from the dude, of course. Does chopchops kit need any chamfering or anything before install? I always port my intakes, but I've never screwed with chamfering the other ports on the jug.