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@ray8 avatar
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Molto Verboso
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Molto Verboso
@ray8 avatar
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UTC quote
Hey guys,
Replaced my clutch in-frame. All went well until the top left cover bolt would hardly catch.
Put it back in with blue thread locker and got some bite. Not a lot at all but it didn't spin freely. Other two bolts are solid.
I'd like to ride it. I have everything ready to pull the engine to replace oil seals, etc. Repair those threads...
Just want to ride it for a while before then.
What do you guys think?
@greasy125 avatar
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Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
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Sergeant at Arms
@greasy125 avatar
Weird 80's Vespas & Cool Vintage Lambrettas
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Location: The state of insanity, SoCal
UTC quote
If it's snug? Then roll.

If it starts to leak or the clutch gets wonky then pull the whole thing out and while rebuilding drop a helicoil or timesert in there.

My $0.02 on it

-g
@chandlerman avatar
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Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 79 P200E, 66 Lammy S3
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Lucky
@chandlerman avatar
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 79 P200E, 66 Lammy S3
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UTC quote
You can fix it with a time-sert or a helicoil. It's not a bad job, can probably do it with the motor in the bike if you swing the motor down on the swingarm.
@jimvanmorrissey avatar
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Addicted
Vespa PX200
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Addicted
@jimvanmorrissey avatar
Vespa PX200
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UTC quote
I've run for tens of thousands of kms with only one properly threaded hole out of the three. Just try not no think about it and ride!
@charlieman22 avatar
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Nedminder
62 VBB1T Round Tail W/ leaner sidecar
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Nedminder
@charlieman22 avatar
62 VBB1T Round Tail W/ leaner sidecar
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Location: california
UTC quote
Ray - here is how I would treat:
1. Get a 7mmx1 tap and run it in - use plenty of oil. Get the type of tap that is made for a 'blind hole" since your hole has a bottom.
2. Use a caliper and measure depth - then use a longer bolt than stock. There will be some good thread that you are not utilizing - and it may save your bacon.

Be gentle - it might work.
UTC

Molto Verboso
One or two fun scoots....nothing too precious
Joined: UTC
Posts: 1983
Location: UK (South East)
 
Molto Verboso
One or two fun scoots....nothing too precious
Joined: UTC
Posts: 1983
Location: UK (South East)
UTC quote
^^ +1. I've found this with the screw that holds the cylinder cowl through the flywheel cover and onto the casing. I lost some thread at the top, but found good thread further in when I sourced a longer screw.

I typically replace all my clutch cover bolts with slightly longer flanged bolts of much better quality than the Piaggio ones, and then use 5 or 6 foot pounds to tighten
UTC

Jet Eye Master
PX221 MHR, O tuned PX200, PX125 and some motorbikes
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Jet Eye Master
PX221 MHR, O tuned PX200, PX125 and some motorbikes
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Posts: 4598
Location: London UK
UTC quote
^^ me too

If this doesn't work. The next step is a helicoil. This is normally great forever but if installed badly then still enough meat to put a timesert in.
@christopher_55934 avatar
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Ossessionato
2007 Stella 225
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Location: Rochester, Minnesota
 
Ossessionato
@christopher_55934 avatar
2007 Stella 225
Joined: UTC
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Location: Rochester, Minnesota
UTC quote
charlieman22 wrote:
Ray - here is how I would treat:
1. Get a 7mmx1 tap and run it in - use plenty of oil. Get the type of tap that is made for a 'blind hole" since your hole has a bottom.
2. Use a caliper and measure depth - then use a longer bolt than stock. There will be some good thread that you are not utilizing - and it may save your bacon.

Be gentle - it might work.
Bottoming tap, here is an M7 x 1

https://www.mcmaster.com/taps/thread-size~m7/individual-set~individual/for-use-on~aluminum/thread-direction~right-hand/application~closed-end-hole-threading/
@christopher_55934 avatar
UTC

Ossessionato
2007 Stella 225
Joined: UTC
Posts: 3547
Location: Rochester, Minnesota
 
Ossessionato
@christopher_55934 avatar
2007 Stella 225
Joined: UTC
Posts: 3547
Location: Rochester, Minnesota
UTC quote
M8 Tap ?
With a 1mm diameter difference, would drilling for an M8 tap be an option? I was thinking since you have to drill an oversized hole for a tap anyway. Would an M8 bolt fit through the clutch cover holes? Would the M8 be a big enough difference to get good threads? If it didn't work you would still be able to drill for a thread repair kit.
@chandlerman avatar
UTC

Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 79 P200E, 66 Lammy S3
Joined: UTC
Posts: 9935
Location: Nashville

70 Days Since Last Explosion
 
Lucky
@chandlerman avatar
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 79 P200E, 66 Lammy S3
Joined: UTC
Posts: 9935
Location: Nashville

70 Days Since Last Explosion
UTC quote
It's an M6 to start with, so M7 is already effectively "first oversize"
OP
@ray8 avatar
UTC

Molto Verboso
Joined: UTC
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Location: Los Angeles
 
Molto Verboso
@ray8 avatar
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Posts: 1886
Location: Los Angeles
UTC quote
Took several rides today. New clutch feels great (will make a new thread for that one--px engine on 8's solved).
No leaks.
Now I remember, there was one bolt longer than the other two. Pretty sure I put them back where they came out of, but it's possible that was the bolt that went there. Looked like it was around 10mm longer than the other two.
Really appreciate all your advice, guys. Enjoy your weekends!
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