jcoahran
Scoot Enthusiast
89 zuma ii
Posts: 347
|
Post by jcoahran on May 12, 2012 15:54:30 GMT -5
after buying and selling many junk scooters i decided it was best to build my own to my own needs, it's a first generation "sunny" style. first thing to do? put a big bore kit in it. removal of the engine was a very simple procedure. as i had already had every line/hose disconnected that only left me with 1 long bolt to remove the engine. after doing so i removed the engine case to have a look at the engine, this was a very very corroded 50cc so i brought it back to my room along with my toolbox, and started stripping it down. easy enough...after i removed the stock pistion i ran into a minor setback, i had to spend the next 15 minutes with a knife scraping the base gasket from the case, normally this would be an easy process i believe. but not in my case :lol: there was bits and pieces all along the case, since this was my first time ever doing any work to the inside of an engine i wanted to make sure i done it right no matter how long it took. so when i finished getting that done, i made another newbie mistake...i couldn't figure out which gasket was the base gasket, and the tutorial i was using didn't explain which was which, so i followed the pictures as best as i could. most say they have trouble getting the wrist pins in...i was able to do it with my fingers, fairly easy too. so after i got the new piston on came the hardest part for me, getting the piston with the rings on, inside the cylinder. i tried and tried and tried, eventually my luck helped me out and i got it in. even though the locater dowels gave me a hard time getting the cylinder against the case. the rest of the process was fairly easy. i put my big bore head on and it went right into place. next was my cam. this took me a minute to figure out, as i couldn't get the cam straight, so i went ahead and put the rocker arms in place. and start slowly tightening them. next thing i know..SNAP...i thought for sure that i had broken something, but nothing was falling off so i looked at the cam again to find that it snapped itself into place. after that i gave it a good valve adjustment, and put the valve cover on, there will be pictures of what i was doing at the very end of this. so just today, i got my spark plug throttle grips and air filter in the mail, so i decided it was time to re-jet my carburetor, so i did, now it was time to get the studs from the old head so i could re-use them, it made me very angry for the first couple of minutes, then i used this process, put one nut onto the stud, put another nut onto the stud and tighten it all the way against the 1st nut...then loosen the 1st nut and remove the stud. i did this for both my exhaust and intake studs. so then i proceed to put the valve cover on..simple. then the intake boot and then my carburetor with the airfilter on it. simple. now for the next phase (which i still haven't done) i need to get a drill bit, and drill the rivets out of the gray pipe on my custom exhaust that some of you may have seen in previous posts from me. im doing this for a nice snug fit against my stock pipe. my custom pipe was made from a car exhaust tip and a generator muffler. this should allow for good air flow, and good back pressure. after i get that done and get the exhaust on the pipe, i will then put the exhaust on the engine and start it. here is a couple pictures from my proceedures explained in this post.      :chinese: :twisted:  :popcorn: :drool: :disco: |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 12, 2012 16:21:45 GMT -5
|
|
jcoahran
Scoot Enthusiast
89 zuma ii
Posts: 347
|
Post by jcoahran on May 12, 2012 16:41:31 GMT -5
don't worry 1fastqmb, mines there ^.^ it was a little broke on top and as you can see i just used some plastic from a gallon of ice cream to cover it, i done that before i even took the engine out of the scoot, and i made it so the plastics i made bolt right on to the engine cover, thats why it looks like its not there in the pics, when i put the plastics back on i'll post another pic so you can see what im saying. but trust me, it is there.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 12, 2012 16:47:08 GMT -5
no im saying the ones that go over the cylinder.
|
|
jcoahran
Scoot Enthusiast
89 zuma ii
Posts: 347
|
Post by jcoahran on May 12, 2012 16:49:30 GMT -5
oh lol their there too, i just pulled them off for installing the big bore kit. its laying on my bedroom floor right now those definitley go back on for 2 reasons, 1. its a part of the cooling system that the scooter obviously needs. 2. i want my engine to look as stock as possible.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 12, 2012 16:57:29 GMT -5
what were the oil ring gaps? if they are over .02 it will smoke like a chimney. I like for mine to be no wider than .15
|
|
jcoahran
Scoot Enthusiast
89 zuma ii
Posts: 347
|
Post by jcoahran on May 12, 2012 16:59:08 GMT -5
no idea, the kit i ordered said they were all already gapped like their supposed to be. all i had to do was put them on  didn't have any way to measure it anyway, if i was lied to, would it cause engine damage? |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 12, 2012 17:08:07 GMT -5
if they are too wide it will smoke like a train. if they are too close they will break. If it was me I would take it back apart and check the gaps while its still easy to do.
compression rings .07-.09
oil ring gaps not more than .2....less is ideal.
if its the kit off ebay from robotechlegacy odds are the gaps are too wide..they usually are. I had to do 2 motors over again after not checking the oil gaps on those kits and believe me i check them now that was alot of work.
Get some feeler gauges from napa or autozone etc...
|
|
jcoahran
Scoot Enthusiast
89 zuma ii
Posts: 347
|
Post by jcoahran on May 12, 2012 17:18:44 GMT -5
i ordered my kit from scrappydoggs and it was written on the package the rings were in, it said "Preset rings"
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 12, 2012 17:20:38 GMT -5
i ordered my kit from scrappydoggs and it was written on the package the rings were in, it said "Preset rings" those kits are the same china kits that robotechlegacy has. dont trust anything that comes from china that says 'preset'. |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 12, 2012 17:23:52 GMT -5
i bought some rings from SDS and sure enough the oil ring gaps were too wide as well. I buy the 50mm hoca piston and ring set and use the rings out of that. (cant use a hoca piston with a china bore unless you use 2 thick hoca base gaskets.)
|
|
jcoahran
Scoot Enthusiast
89 zuma ii
Posts: 347
|
Post by jcoahran on May 12, 2012 17:28:32 GMT -5
seriously? i ordered it because i was tired of fooling with crappy china parts -.- ill get me a feeler guage and check it, thanks alot for the advice 1fastqmb!
|
|
jcoahran
Scoot Enthusiast
89 zuma ii
Posts: 347
|
Post by jcoahran on May 19, 2012 21:25:19 GMT -5
finallly got her running after multiple issues, with electrics. swapped the motor to a twin bike with no issues, fried the starter, but i could kick start it, then i let my dad drive it and he blew my head gasket...i think...LOL
heres a video of her first run
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 19, 2012 21:31:12 GMT -5
finallly got her running after multiple issues, with electrics. swapped the motor to a twin bike with no issues, fried the starter, but i could kick start it, then i let my dad drive it and he blew my head gasket...i think...LOL heres a video of her first run why are you revving the piss out of it? |
|
jcoahran
Scoot Enthusiast
89 zuma ii
Posts: 347
|
Post by jcoahran on May 19, 2012 21:34:50 GMT -5
hard break in process.
|
|
:chinese: :twisted: 
:popcorn: :drool: :disco: 
didn't have any way to measure it anyway, if i was lied to, would it cause engine damage?