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  #1401  
Old 05-26-2011, 04:02 PM
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mapbike mapbike is offline
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Default Re: what did you do to your motor bike today?

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Originally Posted by Skarrd View Post
nope not at all...

got a new top end coming from zoom bicycles.

cylinder
piston
rings
head and base gasket

this weekend gonna pull the engine off the bike and turn it upside down and shake it to see if anythings still lingering in the crank case.

Be sure and check the lower con rod bearing and make sure it is not missing rollers, this is what happend to my first engine that did exactly what you just described yours did.....

Mine seized up on me, I was able to get it unseized and then I thought it might be ok, I put it on another bike an it started and seemed to run fine, I took of one day on a 8 or 9 mile trip and on the way back about 200 yards form my house itjust quit and wizzed down to nothing, I could tell it had lost all compression....so I knew it wasn't a good thing that just happened, I pulled the jug and I had a ring broke, deep score it piston, deep score in cylinder wall, large chunk busted out of transfer port and then after checking things closer I realized that I was missing one or 2 needle bearing on the crank because there was way too much space in between the ones that were left and I could see that they tried to turn at an angle on the crank instead of sitting straight on the crank journal.

This is when I got a used crank form someone and rebuilt that engine and it ran very good until that used crank petered out on me and ate into the case on the clutch side allowing the mag rotor to eat into the case on it's side and destroy the crank seal.

Check that lower end out very good or you may be rebuilding another grenade.......

best wishes to ya

Peace
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  #1402  
Old 05-26-2011, 04:07 PM
chrisme chrisme is offline
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Default Re: what did you do to your motor bike today?

^ sound advise. I too was going to rebuild a top end after a piston ate itself, and everything involved.

But the bottom end was totally hosed. Tipped it upside down and needles fell out...
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  #1403  
Old 05-26-2011, 04:07 PM
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Skarrd Skarrd is offline
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Default Re: what did you do to your motor bike today?

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Originally Posted by mapbike View Post
Be sure and check the lower con rod bearing and make sure it is not missing rollers, this is what happend to my first engine that did exactly what you just described yours did.....

Mine seized up on me, I was able to get it unseized and then I thought it might be ok, I put it on another bike an it started and seemed to run fine, I took of one day on a 8 or 9 mile trip and on the way back about 200 yards form my house itjust quit and wizzed down to nothing, I could tell it had lost all compression....so I knew it wasn't a good thing that just happened, I pulled the jug and I had a ring broke, deep score it piston, deep score in cylinder wall, large chunk busted out of transfer port and then after checking things closer I realized that I was missing one or 2 needle bearing on the crank because there was way too much space in between the ones that were left and I could see that they tried to turn at an angle on the crank instead of sitting straight on the crank journal.

This is when I got a used crank form someone and rebuilt that engine and it ran very good until that used crank petered out on me and ate into the case on the clutch side allowing the mag rotor to eat into the case on it's side and destroy the crank seal.

Check that lower end out very good or you may be rebuilding another grenade.......

best wishes to ya

Peace
thinking now i'm gonna swap the mag coil over to the grubee bottom end when i rebuild it. that way i'll have time to pull this one apart and carefully inspect everything in it.
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Traditional bicycle riders think we're cheaters. Non riders think our bikes are toys. Bicycle shops think we're a threat. Tree huggers think we're polluters. The police don't know what to think.
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  #1404  
Old 05-26-2011, 04:27 PM
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mapbike mapbike is offline
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Default Re: what did you do to your motor bike today?

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Originally Posted by Skarrd View Post
thinking now i'm gonna swap the mag coil over to the grubee bottom end when i rebuild it. that way i'll have time to pull this one apart and carefully inspect everything in it.
Very good idea.....I would hate to see you put all that money and trouble in that lower just to hammer it again like I did mine..........

I was just being a cheap skate noob when I did mine, but I learned a valuable lesson from that mistake.
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  #1405  
Old 05-27-2011, 11:08 AM
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Skarrd Skarrd is offline
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Default Re: what did you do to your motor bike today?

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Originally Posted by mapbike View Post
Very good idea.....I would hate to see you put all that money and trouble in that lower just to hammer it again like I did mine..........

I was just being a cheap skate noob when I did mine, but I learned a valuable lesson from that mistake.
ouch man, that sucks.

was almost tempted to get some puch parts to replace it with c:
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Quote:
Originally Posted by biknut View Post
Traditional bicycle riders think we're cheaters. Non riders think our bikes are toys. Bicycle shops think we're a threat. Tree huggers think we're polluters. The police don't know what to think.
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  #1406  
Old 05-27-2011, 04:29 PM
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mapbike mapbike is offline
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Default Re: what did you do to your motor bike today?

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ouch man, that sucks.

was almost tempted to get some puch parts to replace it with c:
Yeah, I really should have known better with all the small engine I've built up and repaired over the last 30 years, I wasn't sure what my problem was at the time and thought since the engine came loose I would just go ahead and give it another try...........it lasted about 10 miles and bam ther she went and it was done, that lower con rod bearing was faulty from the factory and it cost me that engine, only thing I saved was the case and clutch parts, then I rebuilt it with a used crankshaft that looked to be in very good shape and it failed again after only 420 miles, engine was still running but the crank shifted and ate up the case under the mag rotor which also destroyed the crank seal which caused it to rev out of control and run like it had cruise control...it didnt run long this way and the jug, piston and rings are all still in good shape, so I'm gonna order a new lower engine assy. from BGF and just put the jug & piston over on it and after a short run in period for the lower end, I should have myself another good engine........if the lower I get is a good one.!

Peace
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Last edited by mapbike; 05-27-2011 at 04:31 PM.
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  #1407  
Old 05-27-2011, 05:02 PM
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mapbike mapbike is offline
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Default Re: what did you do to your motor bike today?

Just ordered that new lower end and a few other parts from LEB/BGF I have a bike I just got a week or so agao that this engine will go on with a 32T sprocket, it will have a sorta board track racer look when I'm done, won't be fancy to start with and may never be real fancy but I hope it will make a nice riding bike that will cruise real nice at around 35MPH, I may give that reversed jug a try on this one, not for sure on that one yet, but I might...... I know I will be doing some mods to this engine that I havent done to the others yet just to see if I can squeeze a bit more power out of it for that 32T sprocket.

Peace
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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!

Last edited by mapbike; 05-27-2011 at 05:04 PM.
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  #1408  
Old 05-27-2011, 06:41 PM
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WildAlaskan WildAlaskan is offline
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Default Re: what did you do to your motor bike today?

it was so hot out today i had to go for a 8 mile ride to cool off. a woppin 72 degrees felt like i was in an oven
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  #1409  
Old 05-27-2011, 06:53 PM
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Default Re: what did you do to your motor bike today?

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it was so hot out today i had to go for a 8 mile ride to cool off. a woppin 72 degrees felt like i was in an oven
You would just love our Texas weather then, over 100 here today and thats in the shade.

I have a daughter -in - law and two grandbabies that live in the Fairbanks area so I guess they are experiencing the heat wave there too..LOL!
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  #1410  
Old 05-27-2011, 07:01 PM
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Default Re: what did you do to your motor bike today?

LOL WA. I read th 1st 5 words and thought; "wut, got up to 70?"

80 and muggy today here after the snowiest winter I have seen in CT. It just rained for 11 st8 days and we got 'skeeters bitting skeeter as we 2 legged folks are running out of blood for em. As soon as I get done mowing/fixing mowers, I am building about 50 bird houses and one big butt bat house, snork. Only thing I got to do with my motorized bicycle is move it out of the way this week
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