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1973 Z1-NOISE IN MOTOR

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johny brando
100Club
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Joined: 3rd Aug 2013
Location: australia

Re: 1973 Z1-NOISE IN MOTOR

#61 PostAuthor: johny brando » Mon Jan 14, 2019 3:08 am

PJONO wrote:Crank shaft sent away for check and report.See what it throws up. So that's now a bit of waiting game now. Will install new gearbox bearings and new clutch roller bearing to current gearbox. By doing this I feel I've covered all bases. It's a bike I intend to keep and ride for some years so it's fair enough. Will continue saga in due course. Theres other stuff I can be doing in the meantime. I typically like to do things/repairs in sequence as opposed to concurrently. Never know where the fault is if you've done loads of work -particularly electrical. Someone offering a brand spanking crank NOS on eBay £1295!


I'd be having a very close look at the clutch cush drive too.....nows the time while the cases are apart - if the springs rattle ...it's 40+ years old ,tired / buggered & apparently Buzzard has the means to now to get in & out & fit the new correctly rated progressively springs in the correct order . Plus as Rob zed1015+ stated ensure your Starter sprag gear float is set up correctly = a slight drag on it when revolved ( 3 different rubber damper sizes are available & you can adjust that too if needed..... with the use of a Sheet of Glass & some 400 grit paper ) Happy hunting, Cheers Johny B.

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PJONO
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Joined: 13th Jun 2018
Location: North Yorkshire

Re: 1973 Z1-NOISE IN MOTOR

#62 PostAuthor: PJONO » Mon Jan 14, 2019 9:23 pm

Hi,
The larger gauge 'cush' springs were free rattling in the clutch basket' .They were loose side to side by 2-3 mm. Have changed the clutch basket now.. The ones in the replacement unit are pretty tight. They will turn but no side to side play in them.

In respect of the starter drive -the noise wasn't anywhere in that area and all looks good there. The noise was deeper in the gearbox -thinking the basket. It would be consistent with the frequency of the noise which was at a lower speed than power going through the gearbox. Hoping I've sorted it. Time will tell. Suspect the crank check and repair is going to drag-on was told three weeks . Looks as though its going to be longer.
"Some people are like and old TV's. They need a few slaps to fully get the picture"

johny brando
100Club
100Club
Posts: 248
Joined: 3rd Aug 2013
Location: australia

Re: 1973 Z1-NOISE IN MOTOR

#63 PostAuthor: johny brando » Thu Jan 17, 2019 10:17 pm

PJONO wrote:Hi,
The larger gauge 'cush' springs were free rattling in the clutch basket' .They were loose side to side by 2-3 mm. Have changed the clutch basket now.. The ones in the replacement unit are pretty tight. They will turn but no side to side play in them.

In respect of the starter drive -the noise wasn't anywhere in that area and all looks good there. The noise was deeper in the gearbox -thinking the basket. It would be consistent with the frequency of the noise which was at a lower speed than power going through the gearbox. Hoping I've sorted it. Time will tell. Suspect the crank check and repair is going to drag-on was told three weeks . Looks as though its going to be longer.


Good call changing out the clutch basket that was a good move !...& the newer one sounds to be OK with better free spring / pre-load lengh . If your crank is being checked out with SEP @ Kegworth it is well worth the wait ..they were always ' really good' & did a great complete Z1 Crank rebuild & pin weld for me many years ago . I'd still also check out your Starter sprag clearance & it's correct assembly + the 3 Roller pins spring lengths & there condition.... as it would be sound preventative protection & easier to do this now while you have the motor apart . Seems like you'll have a nice motor when you have finished it . Cheers Johny B .

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PJONO
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Location: North Yorkshire

Re: 1973 Z1-NOISE IN MOTOR

#64 PostAuthor: PJONO » Thu Jan 17, 2019 11:07 pm

Hi Thanks for your thoughts. Replaced the starter springs and associated bearings prior to strip down. Crank gone to Chris Applebee who comes well recommended from many people. He has had a 'glance' only at the crankshaft and at this time and believes a couple of the rods are on the loose side. He's been asked to strip it and report. Assuming what's found isn't way over the top financially I'll have it refurbished. I've replaced all the gearbox bearings, clutch bearing , cam chain wheels and chain and if the crank's done properly I believe I covered all bases.
"Some people are like and old TV's. They need a few slaps to fully get the picture"


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