Installing a new right crankcase

KHPower · Post by **KHPower** » Mon Jul 09, 2007 10:59 am

I got the flywheel of using a basic puller. I went to the hardware store and bought the right size bolts 6mm to fit the area where the fan mounts to the flywheel. At first it was hard , then I tried again and the final hard turn , it poped off! At first I almost damged the cdi by puting a little scrape on the outside housing , but I believe it did no damage.

Now I wait for my parts (right Crankcase) but , now I am wondering if I can pull the half off with the puller I used , using the same bolts but in the bolt threads where the cdi was mounted towards the middle of the case.

I also unscrewed the bolts holding the head and jug and with a gental tap , it came loose and I could see the piston and how it works. All looks good inside.

When I get the right crancase off (I am going to do this right before I install the other so I dont get anything dirty) What kind of lube should I use on the crank? and can I make my own gasket like the way Noiseguy said in the advanced tech docs? or should I just plug and play and bolt?

Thanks Guys

KHPower · Post by **KHPower** » Mon Jul 09, 2007 11:29 am

Here are some pics of my progress

I have a clamp on the head to keep the piston intact for now , but I am still trying to figure if I should use those inner bolts to remove the case since as you can see how much of it is broken I have limited options

chevyguyjay · Post by **chevyguyjay** » Mon Jul 09, 2007 1:26 pm

to me, wouldnt be easier to take the engine of the bike and work on it? im thinking your going to have to anyway. changing the side of the case really isnt that hard to do. if u think u have the room to use that pully kit, use it. theres 5 screws that hold that side of the case on. bolt your pully kit to the middle two holes. make sure u dont damage the crank using that as your center piece. as for oil, any oil should work. just put on a light coat.

KHPower · Post by **KHPower** » Mon Jul 09, 2007 2:40 pm

I realized it would be easier to do this with motor off also , This is how I started so I will eventually need to take it off.
I dont want to ruin the crank putting on all that pressure , but would it ba a good Idea to tap the broken rightside case with a hammer to maybe loosen it a little , since I more than likely will never use it , taking care not to ruin or chip the left case?

mousewheels · Post by **mousewheels** » Mon Jul 09, 2007 2:59 pm

Thanks, Nice pics, great progress...

Not an expert here, but I have tapped on the 2 cases I broke apart. It worked and both halves came through usable.

Kenny_McCormic · Post by **Kenny_McCormic** » Mon Jul 09, 2007 3:00 pm

just whatever you do be very very careful not to get any dirt in there or the engine will not have a very long life expectancy. it would be k to tap on the case if your worried about chipping it use a block of wood in between the hammer and the case. And for assembly oil oil just use whatever you want i use 30 weight when i build chainsaws and stuff.

KHPower · Post by **KHPower** » Mon Jul 09, 2007 3:19 pm

I will be very carefull not to get any dirt in the case. Its in a garage , but the bike is dirty and before I remove the case , I will degrease it and blow away any peices of dirt,grease and the pieces of weld that did not hold.

I was thinking of welding the old case just for fun when its removed , because if done right and the cast aluminum is cleaned and heated properly , that Alumiweld I think would actually work

When I recieve the motor I bought I will either use the case from that and clean it up and repair my original motor. I have around 3,000 miles on it and the one I bought has 6,000 see my other post asking about the Elite ES and E.

HuskieMobileMan · Post by **HuskieMobileMan** » Mon Jul 09, 2007 4:11 pm

Yep, use the two center holes that the cdi/alternator bolted to to pull the case. Thread the nut on the crank about halfway and then pull the case half. This will help you not damage the crank. It should come off fairly easily. Hopefully the bearing comes off with the case and doesn't stay on the crank.

KHPower · Post by **KHPower** » Mon Jul 09, 2007 8:01 pm

Thanks for the tips
I was about to order from scooter therapy and in my order I wanted a kickstart gear and a right crankcase and I asked about a gasket and the guy wrote me back and said a new gasket was not nessesary
So basicly , when I get my motor , I remove the right crankcase ,lube the crank with 30 w oil and install the crankcase , tighten everything and I am good to go?

my4sons · Post by **my4sons** » Mon Jul 09, 2007 8:08 pm

Been working on a 1989 sb50p, new piston and rings, running but making a noise that I think is coming from the bearings in the crankshaft. When the piston is down, you can wiggle the flywheel back and forth a little and there's a clicking type noise in there. Wondering if they are easily accessible to check and change once the right side of the crank case is off?

Thanks

Apologize if this is a duplicate, new to this, but learning alot!

KHPower · Post by **KHPower** » Mon Jul 09, 2007 8:16 pm

HuskieMobileMan wrote:Hopefully the bearing comes off with the case and doesn't stay on the crank.

If they do stick to the crank ,cant I just pull them off? my luck they probably will

I checked out the Hayes scooter book a few weeks ago , I will check on what the bearings look like , so I ahve a good idea what to look for.

Do you guys think I should pull the case off now ?or wait till I get the new one??

Thanks again

Kenny_McCormic · Post by **Kenny_McCormic** » Tue Jul 10, 2007 2:30 am

wait until the new one comes that keeps it from staying apart or too long and getting dirty

HuskieMobileMan · Post by **HuskieMobileMan** » Tue Jul 10, 2007 9:12 am

KHPower wrote:
HuskieMobileMan wrote:Hopefully the bearing comes off with the case and doesn't stay on the crank.

If they do stick to the crank ,cant I just pull them off? my luck they probably will

I checked out the Hayes scooter book a few weeks ago , I will check on what the bearings look like , so I ahve a good idea what to look for.

Do you guys think I should pull the case off now ?or wait till I get the new one??

Thanks again

The bearing will be pressed onto the crank so it may be difficult to remove. I bought a cheap jaw puller for if this happens to me.

HuskieMobileMan · Post by **HuskieMobileMan** » Tue Jul 10, 2007 9:14 am

my4sons wrote:Been working on a 1989 sb50p, new piston and rings, running but making a noise that I think is coming from the bearings in the crankshaft. When the piston is down, you can wiggle the flywheel back and forth a little and there's a clicking type noise in there. Wondering if they are easily accessible to check and change once the right side of the crank case is off?

Thanks

Apologize if this is a duplicate, new to this, but learning alot!

Yep, sounds like the bearings.

my4sons · Post by **my4sons** » Tue Jul 10, 2007 2:48 pm

Started to take everything apart to get inside the crankcase to check/change those bearings. Just put the new piston/rings in the other day, ran it a couple of times maybe went a mile, left it idling in the garage for a few minutes. Wanted to see if the piston/rings still looked good but no go, the new piston is scored, almost looks as bad as the one I replaced and the cylinder is all scratched up too (had it honed a little at the local HS shop, took it to the local Honda dealer and they checked it to make sure it was still round, gave me the go ahead). Does dirt, possibly broken piston pieces down in the crankcase cause this and probably ruined the bearings? Appreciate any/all help, my sons said I couldn't fix it and I'm determined to prove them wrong or give it my best shot before calling quits.

Thanks,

The mom

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Installing a new right crankcase

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