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Post by niz76 on Jul 16, 2015 22:12:09 GMT -5
Woops- that's right! Somehow I keep thinking you're running a single ring race piston... I don't think that copper spray ever really gets hard. I think it just stays kinda gooey like that (I think it hardens up after the engine heats up a bit). Nice sanding job on your head btw- Lookin good now! Hey you seem to be getting pretty good at this scoot tuning stuff!
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Post by sai on Jul 16, 2015 22:49:28 GMT -5
Woops- that's right! Somehow I keep thinking you're running a single ring race piston... I don't think that copper spray ever really gets hard. I think it just stays kinda gooey like that (I think it hardens up after the engine heats up a bit). Nice sanding job on your head btw- Lookin good now! Hey you seem to be getting pretty good at this scoot tuning stuff! You think so? I can tell some parts are more sanded than the other and the corners are a little rounded -_- I really hope this works... it's 11pm and I'm going to take the cylinder out, stuff the ports with towels and paper towel and spray copper into it. Then use a light bulb on the cylinder and head... I also learned that I can use carb / brake cleaner to get rid of the copper spray, so I'm going to do that to the cylinder wall. It's more like I'm desperate to get this running soon since I have volunteer work in a day. PS: I'll have my Liquid cooled parts in hand in a week... are you interested in figuring it out with me?
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Post by sai on Jul 16, 2015 23:15:27 GMT -5
so I ductaped the walls of the cylinder, stuff towel from the bottom and then started spraying the copper liquid. Going to put the cylinder and head under a hot lamp since it's 11pm now so I can put it together in the morning and test
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Post by sai on Jul 17, 2015 0:01:03 GMT -5
I'm just wondering, say I have a new BBK, why not do the cylinder head shave right off the batt? Wouldn't this make the compression even more powerful?
Or is this method only best to use when we are compensating for a loss in cylinder wall and piston ring integrity?
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Post by niz76 on Jul 17, 2015 0:18:50 GMT -5
Right off the bat is actually the best/correct time to do it! Checking and adjusting your squish settings should be a priority when setting up a new performance cylinder. Eventually you'll probably even get into checking/setting your port timings etc. but that's a whole nuther discussion lol.
I have come across some scoots during my flips that had crappy cylinders/rings with low compression and I just happened to use the squish trick to get the compression back up just to get them to run again, but setting your squish clearance is usually not a compensation thing at all- it's a performance thing!
BTW- Sure I'm Down with helping you figure out the liquid cool conversion! But, I really don't have any experience with liquid cooled, but a few guys here have/are doing the conversions!
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Post by sai on Jul 17, 2015 1:16:08 GMT -5
Right off the bat is actually the best/correct time to do it! Checking and adjusting your squish settings should be a priority when setting up a new performance cylinder. Eventually you'll probably even get into checking/setting your port timings etc. but that's a whole nuther discussion lol. I have come across some scoots during my flips that had crappy cylinders/rings with low compression and I just happened to use the squish trick to get the compression back up just to get them to run again, but setting your squish clearance is usually not a compensation thing at all- it's a performance thing! BTW- Sure I'm Down with helping you figure out the liquid cool conversion! But, I really don't have any experience with liquid cooled, but a few guys here have/are doing the conversions! Wouldn't shaving the cylinder head from a fresh new bbk make the compression even higher thus making it push even more mph / power? Im assuming that a company like malossi would have decided the way the kit is out of the box is the best setting?
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Post by 190mech on Jul 17, 2015 4:04:00 GMT -5
Many companies design a kit with too much squish clearance as a safety factor for the tons of folks out there that slap them on with 0 tuning,,the closer to the 'right' setup the chances of meltdown is much greater with bad tuning...
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Post by iwiketuddlz on Jul 17, 2015 7:38:02 GMT -5
Make sure you get a big enough radiator!!! It will certainly help to maintain a normal steady operating temperature!!! And make sure it has plenty of air flow!!!!
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Post by sai on Jul 17, 2015 13:45:39 GMT -5
Update:
So I let the cylinder and head dry over night from the liquid copper and even set it under the sun for 3 hours. Put it together, turn on the manual choke to start, it runs for 200 feet, died on me, can't start it, open the cylinder back out (yes, at this point, I'm sick and tired of it)
and behold, one side of the cylinder I see black, so it blew the copper spray seal out completely. I'm putting the used rubber o-ring back in, sprayed more copper on that side again and letting it set in the sun.
I'm assuming that side is slightly lower than the rest of the cylinder head flatness -_-
I'm so tired of this...
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Post by sai on Jul 17, 2015 16:17:36 GMT -5
Another update... after adding the head rubber o-ring back I finally can start the engine with the kick starter... the electric starter won't even start to rev it.
How reliable is this engine usually once we shaved that 1mm, and did all those work? I have to travel about 40miles each way tomorrow =\
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Post by niz76 on Jul 17, 2015 16:40:04 GMT -5
I shaved the head on mine and drive it every single day without issue... Have done many many long rides that eat through full tanks of fuel on a regular basis!
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Post by sai on Jul 17, 2015 16:58:02 GMT -5
I shaved the head on mine and drive it every single day without issue... Have done many many long rides that eat through full tanks of fuel on a regular basis! Just rode it for 10 minutes each way... I can tell the compression is slightly better, but definitely not at what it used to be. Perhaps it's because of the rubber o-ring that I had to add to compensate for the 1 side that I shaved too much.
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Post by Jwhood on Jul 18, 2015 0:22:20 GMT -5
Kymco makes a nice stock crank,aeromyst over at scooter invasion is a kymco guru I'd talk too him!!
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Post by sai on Jul 18, 2015 2:24:40 GMT -5
Thanks for the heads up,I'll go stalk him soon.
Niz, anything else I cAn do at this point?
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Post by niz76 on Jul 18, 2015 21:53:25 GMT -5
At this point we need to know the numbers again with that o-ring in there. That'll tell us what we need to know...
What it the squish clearance now? What is the compression now?
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