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X-80 z-80 engine

2 stroke engine kits need careful installation and setup, find out how from our professionals here!


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  #1  
Old 02-05-2012, 12:02 PM
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Default X-80 z-80 engine

Just wanted to let everyone know I will only buy these kits in the future.
Both these engines have an improved high compression head with a proper squish band. And also come with an improved aluminum intake that solves the erratic idle that most kits have. both engine kits are identical except for the sprockets. The z comes with a 41 and the x comes with a 44. these kit also has the heavy duty 415 chain.
I've also switched the head and intake from my dead z kit that I roasted over reving it to 55 mph with a 30tooth to an older tired feeling engine and it ran like a beast.

(looking over boy go fasts auctions todat, it apears he's selling a diffrent engine now and still calling it a z-80. Leb still has the good x-80) when looking to buy, look for aluminum cast intake and muffler with a heat shield. I beleave Pirate cycles picked up a container of them.
http://www.piratecycles1.com/66bienkit.html

Last edited by SlowBalt; 02-07-2012 at 02:11 PM.
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Old 02-05-2012, 01:05 PM
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Default Re: X-80 z-80 engine

I just bought a Z80S from bgf is this the same as what your talking about? How long is to long of a run time for these engines? Sellers says 30 min...
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Old 02-05-2012, 01:27 PM
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Default Re: X-80 z-80 engine

I'm not shure but I think it's the same just with the small front mount. When you get it take the head off and take a pic of the inside of the head and the intake, and i'll let you know. Also It's always a good idea to pull the head and look for debris befor the first run. With crapy china packing i found a nut in the cilinder one time from all the packing roling around in shiping.
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Old 02-05-2012, 07:26 PM
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Default Re: X-80 z-80 engine

Quote:
Originally Posted by SlowBalt View Post
Just wanted to let everyone know I will only buy these kits in the future.
Both these engines have an improved high compression head with a proper squish band. And also come with an improved aluminum intake that solves the erratic idle that most kits have. both engine kits are identical except for the sprockets. The z comes with a 41 and the x comes with a 44. these kit also has the heavy duty 415 chain.
I've also switched the head and intake from my dead z kit that I roasted over reving it to 55 mph with a 30tooth to an older tired feeling engine and it ran like a beast.
Have you actually taken both of your motors apart? The reason I ask is because I bought both a X80 and Z80 motor kit, and I found several distinct differences.

A major difference was the engine blocks. The X80 had a wide 50mm front mount. The Z80 was regular size 40mm. The heads on mine are different.

The crank assemblies were identical, and were the bolt on flyweight type. The cylinders, and pistons were identical.

In this pic the X80 head in on the right, Z80 left. As you can see there's quite a bit of difference.

The sprockets in my kits were the same as you mentioned, and the X80 kit came with the bigger size gas tank.



I should also add that the crankshaft in my X80 motor was a lemon that was so out of true, and out of balance, that to motor went south in 500 miles.

The crank in the Z was better true, but still had way bad balance.

The question is, are these findings any different from any other China girl kits? IMO no.

Last edited by biknut; 02-05-2012 at 07:28 PM.
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Old 02-05-2012, 08:41 PM
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Default Re: X-80 z-80 engine

The head on the right is the head that came on both my z and x 80kits. I actualy had the older manic head witch actualy lost compreshion and power compared to the head on the right. I also have the head on the left witch came off one of my older kits i bought off BGF. I think he shiped you one of his older kits by acident. He's ben known to do that from time to time.
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Old 02-05-2012, 09:21 PM
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Default Re: X-80 z-80 engine

Quote:
Originally Posted by SlowBalt View Post
The head on the right is the head that came on both my z and x 80kits. I actualy had the older manic head witch actualy lost compreshion and power compared to the head on the right. I also have the head on the left witch came off one of my older kits i bought off BGF. I think he shiped you one of his older kits by acident. He's ben known to do that from time to time.
That wouldn't suprise me at all.

I put 500 miles on my X80 motor before it blew. Performance wise I had no complaints. It ran 37 mph with a 36T and even did 39.8 once.

the motor itself was very noisey right out of the box, and vibrated badly starting about 25 mph. Above 25 the motor started making an imbarrisingly loud squaking noise, that only reduced slightly at even higher speeds.

Even though my crank was lousy, I think everything else was pretty good quality by China Girl standards.
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Old 02-05-2012, 09:21 PM
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Default Re: X-80 z-80 engine

Quote:
Originally Posted by SlowBalt View Post
The head on the right is the head that came on both my z and x 80kits. I actualy had the older manic head witch actualy lost compreshion and power compared to the head on the right. I also have the head on the left witch came off one of my older kits i bought off BGF. I think he shiped you one of his older kits by acident. He's ben known to do that from time to time.
What size were your front motor mounts?
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Old 02-06-2012, 01:07 AM
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Default Re: X-80 z-80 engine

here is a head off a BGF 66cc.....



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  #9  
Old 02-06-2012, 06:04 AM
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Default Re: X-80 z-80 engine

That's not a z or x engine . The way to spot them is slotted bolts . They don't have Philips heads, also head bolts are 13mm socket on the x-z older are 14mm.
Both mine are large front mount.

Last edited by SlowBalt; 02-06-2012 at 06:07 AM.
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Old 02-06-2012, 06:06 AM
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Default Re: X-80 z-80 engine

I have over 3000 mi on my x motor. The z will be saved for the east cost race.
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