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early eng diff's

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baz
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early eng diff's

#1 PostAuthor: baz » Wed Jan 07, 2015 1:29 pm

does any one know roughly what the eng numbers were in 73 when the early engines with the wonky 3 on 903 and the slim timing chain adjuster etc changed to the more common type you see........cheers
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malmojoe

#2 PostAuthor: malmojoe » Wed Jan 07, 2015 2:51 pm

I guess it changed when they added the cam chain tunnel o ring. Don't know when though. Z1A >20000?
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#3 PostAuthor: baz » Wed Jan 07, 2015 3:36 pm

malmojoe wrote:I guess it changed when they added the cam chain tunnel o ring. Don't know when though. Z1A >20000?


it was way earlier than that i think pal :??
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malmojoe

#4 PostAuthor: malmojoe » Wed Jan 07, 2015 3:43 pm

Just a guess.
Last edited by malmojoe on Wed Jan 07, 2015 4:44 pm, edited 1 time in total.
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wilsonsjw11
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#5 PostAuthor: wilsonsjw11 » Wed Jan 07, 2015 4:10 pm

Baz,
I think the early cam chain tensioner housing was fitted to the first 4000 odd bikes.
Regards
Steve
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z2.john
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#6 PostAuthor: z2.john » Wed Jan 07, 2015 4:11 pm

Early block with the 'wonky' 3 as you put it was circa 14300.
Thin cam chain adjuster was up to circa 10000
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baz
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#7 PostAuthor: baz » Wed Jan 07, 2015 4:57 pm

z2.john wrote:Early block with the 'wonky' 3 as you put it was circa 14300.
Thin cam chain adjuster was up to circa 10000


that sounds about what i thought, but iv'e got an eng here with all the early bits on it, short head nuts, wonky 3, slim chain adj, etc, the head as even got the tool marks in the fins around the spark plug holes, all pointing to an early eng ?? but eng number is in the 17000's.
does'nt look like its ever been apart either :??
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wilsonsjw11
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#8 PostAuthor: wilsonsjw11 » Wed Jan 07, 2015 4:58 pm

wilsonsjw11 wrote:Baz,
I think the early cam chain tensioner housing was fitted to the first 4000 odd bikes.
Regards
Steve

Baz sorry for the bum steer :roll:
Regards
Steve
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baz
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#9 PostAuthor: baz » Wed Jan 07, 2015 6:02 pm

wilsonsjw11 wrote:
wilsonsjw11 wrote:Baz,
I think the early cam chain tensioner housing was fitted to the first 4000 odd bikes.
Regards
Steve

Baz sorry for the bum steer :roll:
Regards
Steve


no probs pal ....... :wink:
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z2.john
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#10 PostAuthor: z2.john » Wed Jan 07, 2015 9:37 pm

baz wrote:that sounds about what i thought, but iv'e got an eng here with all the early bits on it, short head nuts, wonky 3, slim chain adj, etc, the head as even got the tool marks in the fins around the spark plug holes, all pointing to an early eng ?? but eng number is in the 17000's.
does'nt look like its ever been apart either :??


Baz,
The engines with the wonky 3 are the ones below 14319 and those NOT in the ranges below

Z1E 14319-15096
Z1E 15948-16458
Z1E 16533-17088
Z1E 18270-18379
Z1E 18442-19079

The reinforced adjuster started to appear around the 10000 engine with a mixture of engines ranging from numbers (approx.) 9000-11000 either having the old or new adjuster
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