[motoman2003]

I know the guys that build motors on here will like this one. I just built a new engine, the biggest most expensive i have ever.



Im all excited when i get the bike done right. So i push it outside to start it and see what happens, let it heat up so i can retorque everything. I kicked it over a few times with no plug to pump up the chain tensioner. Plug in, i bump start it and it fires right off and dies....dead. No compression...Damnit.



I checked over everything building it: timing, piston to head, clayed the valves, stacked gaskets and spacer plates for the right compression and everything....bla bla.



I took off the cam and flywheel cover, timing is good. Took out the plug, no shavings. Pop the valve caps off, and both valves are loose, like .015 loose. Bent valves....damn, why? I checked, i had like a hundred thou valve clearance during the build....



Can you guess what I did??



So, I shine a light in the plug hole. sure enough i can see light around the valve looking in the exhaust port. Tear it down to see where and why it hit the piston I guesss.....



I left a piece of paper towel in the intake while installing the motor in the frame. Sucked it right up and tried to blow it out the exhaust. I towel was under both valves.

 

[dougtrip]

that's pretty funny. a few years ago i drag raced cars. after a saturday at the track i ripped the engine apart to check everything over. when i did this i found a large rag that i must have left in the lifter valley. i must have set it there then grabbed the intake and placed it over the top of it.

 

[jbone483]

That sucks! A buddy of mine did something similar, he left a paper towel in the intake pipe of a turbo car. Idled fine but destroyed the impeller the first time it boosted up.

 

[SCAR8]

hahahahahahahhaahahahahahahhahahahahahahahahahahahahaha.



ha .



That motor is going to be slow anyways

 

[motoman2003]

ryaan, you cant even imagine,,its 190+cc in the stocker.

 

[HACKMUNCH]

whats you stroke in this engine?

 

[motoman2003]

68mm

 

[HACKMUNCH]

you building a John deere tractor huh.

 

[xr1million]

hahaa at least it wasnt anything major... and bet you wont do that again!

you building a John deere tractor huh.

and no he's going for a Kubota diesel like machine...

 

[HACKMUNCH]

sweet make sure you change to a different heat range plug for diesel lol.

 

[motoman2003]

massy yes. i have a 63 motor too. they rev too though, not like your always talkin

 

[HACKMUNCH]

i bet those rings dont last long though. i want to try 60x60 or 59x59. how are starting it?

 

[motoman2003]

The 63 58.5 has hours and hours on it.....fine. The 57 60 rips too.

 

[HACKMUNCH]

are you kick starting it or decompression valve.

 

[motoman2003]

They dont even have kitstarters. i bump em. one kick back and your busted

 

[FASTFREAK693]

They dont even have kitstarters. i bump em. one kick back and your busted

WOW! I WISH I HAD A MOTOR SO BIG IT COULD ONLY BE BUMPSTARTED

 

[HACKMUNCH]

i am hoping to start my lifan 172 by hand, so i can laugh at bbr for selling a $330 cam to make the klx110 east to start. decompression valve = priceless

 

[Guest]

WOW! I WISH I HAD A MOTOR SO BIG IT COULD ONLY BE BUMPSTARTED

What about one so big it has to be started with a starter motor.

 

[motoman2003]

60 68 is dumb. Not useable. Its is a tractor, thats all. You would be better off 57 60 to race.



I just wanted to build the biggest motor. I put in a big cam, carb, and valves. Im retarding the cam one tooth and reclaying the valve clearance tomarrow to try to make it rev more. Ive only ran it about 30 minutes total since yesterday.

 

[Kurlon]

Any room left in that cylinder to go bigger? (I wanna see 62mm but I'm loosing hope.)