ruima 80cc BBK install failure (1996 SA50)

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Eft37
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ruima 80cc BBK install failure (1996 SA50)

Post by Eft37 »

14 months of procrastination ended Thursday.
I attempted the BBK install.
All was going well. Got the old piston & jug off, greased up the new one, got it on. Discover my torque wrench only goes as low as 20lbs, but forum consensus says 14lbs. I decide to go for it and wing it. Didn't lose any circlips into the crank. The jug seems not on straight, I figure the bolts will straighten it out. None of the bolts are grabbing. Pull the bolts, pull the head, then put my rag on jug & start with the mallet. Start again with the cross pattern of the head bolts, 3 grab, 4th won't even go in the hole. Mallet it down in frustration. Realize this isn't going right. Decide to try and repair the tabs on my body panels to cool off (spent 4 hours trying to do this). As I started to open the tube to cement the screen to the panels, I sliced open my hand, preventing me from further damage to the bike.
I may just give it up and take it to Ace Motorcycle Mechanics later next month, and try and get my NU50 running.
Advice?
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kingkamehameha
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Re: ruima 80cc BBK install failure (1996 SA50)

Post by kingkamehameha »

Get longer head bolts lol
ua mau ke 'ea o ka aina i ka pono o hawaii
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evilone
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Re: ruima 80cc BBK install failure (1996 SA50)

Post by evilone »

Pics might help?
2001 Honda Elite
1995 Yamaha Jog
1994 Yamaha Axis

I can't believe
that cop put me
in the backseat
when I clearly
called shotgun.
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Re: ruima 80cc BBK install failure (1996 SA50)

Post by ottoman »

The cyl not sitting down straight and that the bolts wont reach should have told you to stop and find out the issue before using a mallet on it.
Hope you didnt ruin anything
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Re: ruima 80cc BBK install failure (1996 SA50)

Post by Eft37 »

I'd figured one bolt grabbing would pull the jug inline.

Pictures of what would help?
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Re: ruima 80cc BBK install failure (1996 SA50)

Post by Trafficjamz »

How did you slice you hand with a mallet? :confused:

Eft37 wrote:
Pictures of what would help?
Pictures of puppies.

Image
new best 1/8th mile time 9.647 seconds @67.155 mph 310lbs total weight
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Re: ruima 80cc BBK install failure (1996 SA50)

Post by Eft37 »

That helps my mood!
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Re: ruima 80cc BBK install failure (1996 SA50)

Post by Trafficjamz »

Eft37 wrote:That helps my mood!

Looking at pictures of puppies lowers frustration levels. :wink:
new best 1/8th mile time 9.647 seconds @67.155 mph 310lbs total weight
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Re: ruima 80cc BBK install failure (1996 SA50)

Post by Trafficjamz »

take a picture of the "jug that doesn't seem to sit straight".
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Re: ruima 80cc BBK install failure (1996 SA50)

Post by ottoman »

Sorry I cant make out anything wrong in your pics... does the piston move freely in the bore?
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Re: ruima 80cc BBK install failure (1996 SA50)

Post by Eft37 »

It does.

I'm going to bring it in to the shop next month, will proceed to work on/break my Urban Express in the meantime.
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Re: ruima 80cc BBK install failure (1996 SA50)

Post by Eft37 »

I got new bolts, hoping I'd just ruined the old ones. I had my neighbor help, we discovered the 2 exhaust-side holes weren't grabbing, he suggested I get a same size tap and see if the threads in the case were just dirty. I ran the tap in, and it went fine, but I used compressed air and a lot of metal flakes came flying out. I tried to then use the new bolts, but they didn't grab, so the holes are shot. Need to get them tapped and threaded. Advise please.
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Re: ruima 80cc BBK install failure (1996 SA50)

Post by kingkamehameha »

Sorry your having a difficult time. First time doing anything is always rough. Make sure you didnt get any shavings in the case. To the bolts go in when the jug is completely off? They make head stud kits but ive never once had problems using the stock bolts. Defiantely never ever use a mallet while installing your bore. Ever
ua mau ke 'ea o ka aina i ka pono o hawaii
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Re: ruima 80cc BBK install failure (1996 SA50)

Post by LMH »

You can NOT use the stock length bolts for a 50 mm jug, you should use studs or longer bolts. If you side by side the jugs you will see the problem.
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