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  #2041  
Old 08-17-2011, 11:57 PM
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rustycase rustycase is offline
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Default Re: what did you do to your motor bike today?

LOL

Yah, it sure is frustrating, Map...

and that's part of what I don't like about the cns.

When things do not respond to an adjustment you have made to the carb internals, you find yourself questioning pilot error. "Did I get that carb nice and snug up against that manifold???" Maybe it's the dci/coil??? Maybe that NEW plug is bad? Perhaps the crank seals are bad and I should have replaced them?

Well, I hit 23 mph today after dropping the needle all the way down. Best speed yet... performed much better and I was able to ride it to the parts house to get the O-ring to use with the nt carby, as advised by Alf.

So, I'll keep messing with the cns another few days... 2morrow I'll solder up the jet and re-drill it just one size smaller, and see what the results are.

Fun little things to work on!
I'll conquer this cns before I check out, if I'm lucky!
rc
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  #2042  
Old 08-18-2011, 04:44 PM
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Default Re: what did you do to your motor bike today?

RC it sounds like you have tried all the tricks with no big gains, my little 48cc runs 25 to 28 cruise speed easy. It may give you a idea what it should run like if you go ahead and put the nt on, I have a nt as a back up and have run it on my bike. I found out what alot of people said about rich jettting but it still ran about 30 wot. With my cns and the copper spacer I got 32.6 sunday on a long flat country road.
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  #2043  
Old 08-18-2011, 05:11 PM
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Default Re: what did you do to your motor bike today?

The biggest thing to the cns carbs I found is loose jets, maladjusted floats, airleaks around the spacer, and the choke slipping on. After taking care of those things I hit 33 on a quarter mile.
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  #2044  
Old 08-19-2011, 01:15 PM
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Default Re: what did you do to your motor bike today?

Noticed a small leak on the carb float bowl drain screw, the red thing had gas around it. Unscrewed it and slapped Teflon tape on the threads. Also tinkered with my carb needle setting since I'm sure my motor is broken in now. The needle clip was in te middle so I moved it down 1, that gave me really no throttle pull response. Had to put it back in te middle of 5.
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  #2045  
Old 08-19-2011, 02:00 PM
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Default Re: what did you do to your motor bike today?

Pulled head, Jug, carb and piston from my Kulana bike today, and what I found was surprising.

I knew I had a knock on the top end of this engine and that is why I had it down until repair, I figured it was the wristpin bearing causing the problem but this wasn't the case entirely, after getting the piston off of the con rod I pulled the wrist pin out or actually drove the wrist pin the rest of the way out being it was very tight in the piston and noticed that the bearing looked in perfect condition but the wrist pin itself was hammered out and flattend on one side where the bear rides on it, I also noticed that the wrist pin in this engine was a much larger dia. than in any of my other engines and the needle bearing was narrower also, the standard piston, wrist pin, needle bearing or clips would not interchange in this engine, I bought this engine used so I'm not sure of the manufacturer but I do know it is an older one because it sat in a fellas garage for 1.5 years before I got it and it was used when he got it, anyway........

I had a new standard size domed piston, rings, pin, clips, and some of the heavy duty needle bearings I had ordered from motion industries so I just pulled it down, cleaned everything up real good, made a new jug-block gasket, put some high tack permatex sealant on each surface and after a quick light criss X cross hone job of the jug with a brake cyclinder/small engine hone, I got it all back together, fired it up and went for a 10+ mile ride averaging 30-32mph almost the entire way, never missed a beat and ran very good considering the new rings and piston haven't had a chance to seat well yet, this bike has a 34T Alum. Kings sales Sprocket and I hit 41mph for just a short burst going down a slight decline, and it hit 38mph on the flat pretty easy, the exhaust is just a throw on bunch of stuff I had laying around until I get another SBP expansion pipe ordered for it, but it pulls good, runs smooth and NO MORE KNOCKING.....!

Anyone else ever run into the different size wrist pins and bearing before?

This was a first for me, the external size of the needle bearing is the same it just has real tiny rollers and is much thinner and narrower in width than the standard bearings.

below is a pic that may not be real clear but will hopefully show what I'm talking about with the size difference of the pins and bearings.

Sorry about the book here guys.!

Peace, map
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  #2046  
Old 08-19-2011, 09:29 PM
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Wm Holden Wm Holden is offline
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Default Re: what did you do to your motor bike today?

Added some Bose speakers to the trike and blasted down the beach with green day, 3 doors down, etc...blastin'
drank a beer and had many thumbs up...
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  #2047  
Old 08-19-2011, 10:19 PM
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Default Re: what did you do to your motor bike today?

Wm, Seaward, or the Point?
Bet it was nice...
cool & foggy at Morro Rock this morning... the usual summer WX lol


Thanks Greg !
I know I'm missing something...
7 mile speed run today. It just won't gather the R's...
Engine noise sounded like a periodic compression release engaged.
Crazy !
Maybe I'd better pop the head and inspect the gasket. Only reason I haven't is because I have none on hand and would need to make one from copper stock if it were bad... Just what I need, another project.

Ran through the radar sign at 24mph... best speed ever!
Gosh it was running horrible.

Interesting wrist pins/bearings, Map...
What's the group think is better, lighter for more R's and the nice looking roller cage, or the heavier pin with more rollers?
Which one went bad?

Best
rc

Last edited by rustycase; 08-19-2011 at 10:24 PM.
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  #2048  
Old 08-19-2011, 10:45 PM
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mapbike mapbike is offline
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Default Re: what did you do to your motor bike today?

The bearing and wrist pin that went bad is the larger one ( odd ball size one ), I have never seen the larger pin and bearings in these engines before, but then again I dont have loads of experience tearing down a hundred of them either, it may be a very early version right after the brass bushings went away or something, not sure.

All I know is since I put the new piston, rings, pin & bearing in today that little rascal has really come alive, it lack a bit of low end torque from the throwd together exhaust I put on the bike I'm sure, but it will cruise easy at 32-34MPH now after just 12 miles on that new set of parts I put in.

It's pretty darn smoothe doing it too, and that makes it real nice.

I hope you just keep getting yours better and better......

Peace, map



Quote:
Originally Posted by rustycase View Post
Wm, Seaward, or the Point?
Bet it was nice...
cool & foggy at Morro Rock this morning... the usual summer WX lol


Thanks Greg !
I know I'm missing something...
7 mile speed run today. It just won't gather the R's...
Engine noise sounded like a periodic compression release engaged.
Crazy !
Maybe I'd better pop the head and inspect the gasket. Only reason I haven't is because I have none on hand and would need to make one from copper stock if it were bad... Just what I need, another project.

Ran through the radar sign at 24mph... best speed ever!
Gosh it was running horrible.

Interesting wrist pins/bearings, Map...
What's the group think is better, lighter for more R's and the nice looking roller cage, or the heavier pin with more rollers?
Which one went bad?

Best
rc
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I dont always ride WOT, but when I do..I do my best to keep the rubber side down..Ride safely my friends!
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  #2049  
Old 08-20-2011, 01:23 AM
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anim8r anim8r is offline
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Default Re: what did you do to your motor bike today?

Put the rear sprocket on. Park tools order finally arrived so I cleaned out my rear hub guts & packed em with red grease. Didn't have a syringe so I made one out of an inner tube, a chip clip, & this white cone thing I found in the kitchen drawer

I think it's a cake decorator.


Tomorrow should be the final mount & hooking everything up. Still gotta bend the exhaust pipe & get a headlight & speedo. Oh yeah.....need a gas can & oil lol
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  #2050  
Old 08-20-2011, 01:58 AM
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Wm Holden Wm Holden is offline
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Default Re: what did you do to your motor bike today?

Quote:
Originally Posted by rustycase View Post
Wm, Seaward, or the Point?
Bet it was nice...
cool & foggy at Morro Rock this morning... the usual summer WX lol


Thanks Greg !
I know I'm missing something...
7 mile speed run today. It just won't gather the R's...
Engine noise sounded like a periodic compression release engaged.
Crazy !
Maybe I'd better pop the head and inspect the gasket. Only reason I haven't is because I have none on hand and would need to make one from copper stock if it were bad... Just what I need, another project.

Ran through the radar sign at 24mph... best speed ever!
Gosh it was running horrible.

Interesting wrist pins/bearings, Map...
What's the group think is better, lighter for more R's and the nice looking roller cage, or the heavier pin with more rollers?
Which one went bad?

Best
rc
Exactly that...from surfers point down to seaward and back..LOL!! nailed it..
BEAUTIFUL DAY!
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