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Post by hanc1961 on Aug 13, 2016 17:26:03 GMT
any idea whats happened ?
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Post by hanc1961 on Aug 13, 2016 18:40:32 GMT
are 250 tappets a different size to 400 tappets
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Post by hanc1961 on Aug 13, 2016 18:41:20 GMT
it is a 400 motor
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Post by na44superdream on Aug 13, 2016 19:49:46 GMT
I had up till now assumed they were the same  , (though the engines I have/had almost all have been 250s), do you have the dimension between centres of those valve and tappets?  |
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Post by hanc1961 on Aug 13, 2016 20:46:06 GMT
no but I will measure them in the morning
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Deleted
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Post by Deleted on Aug 13, 2016 22:11:01 GMT
That looks like a 250 rocker arm fitted to a 400 head. Logically exhaust rocker is the same as only one valve, but the 2 inlet valves on the larger bore 400 are further apart so the rocker is different. As the parts book suggests.....
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Post by hanc1961 on Oct 29, 2016 0:31:31 GMT
sorry for not posting sooner but my vernier gauge has gone walk about - has anyody managed to shed any light on the problem
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Post by hanc1961 on Oct 29, 2016 0:37:40 GMT
has anybody near (Rotherham/Doncaster)got any 400 tappets I can try on my motor
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danrush4th
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Post by danrush4th on Oct 29, 2016 6:18:28 GMT
Like Paul said mate you have a 250 rocker arm fitted to a 400.
The bore is smaller so that means the combustion chamber is also smaller, making the valves closer together and smaller.
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Post by hanc1961 on Oct 29, 2016 17:20:47 GMT
evil bay have rockers advertised as 250/400
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Post by hanc1961 on Oct 29, 2016 17:22:05 GMT
 valve measurements |
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Post by hanc1961 on Oct 29, 2016 17:26:18 GMT
tappet measurement  |
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Deleted
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Post by Deleted on Oct 29, 2016 18:28:33 GMT
Sellers on Ebay often lump 250/400 parts together as most of the time they are the same. Not for inlet rockers though. Just looked at Ebay and I see our old friend superdream_parts is one of the offenders....again.
I suspect your rockers have "414" on the casting which was actually the Honda model code for the CB250T- cannot get a better sign than that.
I also see plenty of proper 400 rocker assemblies for sale on Ebay now, and you can see from the photos that the inlet arms are more widely spaced than yours. Let me know if it is still not clear and I will post up the actual links....
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, (though the engines I have/had almost all have been 250s), do you have the dimension between centres of those valve and tappets? 
