Author Topic: What have you done with your bike/s today?  (Read 10521 times)

Online WozzA

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Re: What have you done with your bike/s today?
« Reply #615 on: 15.05. 2019 07:19 »
Apologies to the Mods I wasn't sure if I should have posted here or in Engine section.. *????*
Since the rebuild of my '51 plunger and 1st start up it has become really hard to kick over...
so much so that I can hardly manage to get it to turn over with all my weight (92Kg )
Yesterday and again today I decided to strip the motor down to see whats going on in there..
Head & barrels off... Valves, springs, bore, rings & pistons are all good..
Next the check the Cam & followers are moving freely & like new ...
Remove the oil pump which rotates freely..   
Remove all the primary to the crank & there lays a problem...   I can not rotate the stripped crank by hand ..
Next check endfloat.. nope the crank is rock solid sideways...

Soooo... it looks like it's a motor out of the frame again, & split the cases to find the cause. My thoughts are It's got to be either over shimmed or a conrod bearing has spun..  *pull hair out*
Any other thoughts of whats going on appreciated?  *????*
'51 Golden Flash Plunger
'57 Golden Flash Swingarm

Melbourne
The biggest lie I tell myself is
"I don't need to write that down, I'll remember it"

Online Greybeard

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Re: What have you done with your bike/s today?
« Reply #616 on: 15.05. 2019 08:34 »
What a bugger!

Online Swarfcut

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Re: What have you done with your bike/s today?
« Reply #617 on: 15.05. 2019 08:39 »
Wozza.. Looks to be a very good and competent recent build. The fault lies with the crank by your findings. Most likely suspect is the timing bush, set up with too little running clearance, and its partial then eventual seizure giving you the kick over problem. The next consideration too little endfloat, binding the crank on the back of the bush, then finally a big end problem, but this will give you a clue comparing rock on the rods at this stage.  All conjecture up to now, so alas, a complete strip is your next move. Ideal time to check that sludge trap......

 Swarfy

 

Online muskrat

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Re: What have you done with your bike/s today?
« Reply #618 on: 15.05. 2019 08:41 »
G'day Woz.
What was done to the bottom end in the rebuild? If it was over shimmed it would have been stiff to turn right from the start.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Online WozzA

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Re: What have you done with your bike/s today?
« Reply #619 on: 15.05. 2019 09:10 »
G'day Woz.
What was done to the bottom end in the rebuild? If it was over shimmed it would have been stiff to turn right from the start.
Cheers
Hi Musky... The 1992 receipt when it was built shows the bottom end had a crank grind, new bearing shells, crank bolts, cam / cam followers & main bearing... 
The motor had not been started & left out of the frame for 30 odd years.. 
The old parts were also supplied as spares when I bought it..
I previously stripped it to the cases,  check all parts were there as documented..
When I lifted the barrels I could see the new cam & rod bolts & main bearing..so only did a top end strip, I replaced all gaskets including the cork ones, & piston rings..
NOW I wish I dug a little deeper & split the cases..  *problem*
'51 Golden Flash Plunger
'57 Golden Flash Swingarm

Melbourne
The biggest lie I tell myself is
"I don't need to write that down, I'll remember it"

Online bsa-bill

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Re: What have you done with your bike/s today?
« Reply #620 on: 15.05. 2019 09:26 »
had this on my last rebuild, can't be certain but I reckon it was not line bored square, I took it back to the firm that did it with another new bush and it came back fine, no apology but also no charge so you know none of us are infallible
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline cyclobutch

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Re: What have you done with your bike/s today?
« Reply #621 on: 15.05. 2019 09:55 »
Mine seized solid on the timing side bush at just 250 miles after rebuild. Took it to Roger at Cake Street at that point. He reckoned there had not been enough clearance allowed for on the bush.

I was never convinced it wasn't the sprung anti-sump valve I'd fitted on the oil feed side (required on an all new built engine???).
Various, including ...
'58 Iron Head Flash Bitza


Online WozzA

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Re: What have you done with your bike/s today?
« Reply #622 on: 20.05. 2019 09:55 »
Mine seized solid on the timing side bush at just 250 miles after rebuild.
Ditto... When sized correctly it looked like it had not been reamed...  *razz* 
she's ALL FIXED now..  sludge trap tomorrow & polish a couple of nicks out of the rods..
Then re-assembly later this week.. 
'51 Golden Flash Plunger
'57 Golden Flash Swingarm

Melbourne
The biggest lie I tell myself is
"I don't need to write that down, I'll remember it"