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Post by robinbanks on Nov 3, 2020 21:17:31 GMT
How loud should the average SD sound from the top end? I have a 1980 250N.
I seem to have quite a loud ticking / loose chain type of noise that I am convinced is getting worse.
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Post by johnfcbn44dx on Nov 3, 2020 21:40:19 GMT
Suggestions....
Check your tappet clearances.
Static tension of Camchain, push it down to assist the spring, to ensure it is tensioned. Since you have the rocker cover off.
Then still the same noise?
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Post by robinbanks on Nov 4, 2020 21:39:11 GMT
Thanks John. I have tried the method of undoing the nut behind the cylinder head and then tightening it up (with motor running) but I swear it sounds louder now.
I'll take the top cover off and check the valves this weekend.
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Post by andy1kenobe on Nov 5, 2020 9:44:27 GMT
Thanks John. I have tried the method of undoing the nut behind the cylinder head and then tightening it up (with motor running) but I swear it sounds louder now. I'll take the top cover off and check the valves this weekend. I followed the instruction in the Haynes manual to slacken then tighten with the engine running and it made it sound so rattley. This was about 1983 and on my 250. I took it apart and rebuilt with new parts. I have since found out it's not recommend to follow that particular Haynes advice and to do it statically. |
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Post by johnfcbn44dx on Nov 6, 2020 19:56:30 GMT
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Post by robinbanks on Nov 28, 2020 20:38:07 GMT
Thanks John just seen this, that's great.
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Post by Chris P Duck on Nov 29, 2020 19:55:28 GMT
Have you checked the "tappet clearances" lately? Depending on the CC, from memory the 250 tappet clearances adjusted cold inlet 0.004" exhaust 0.005" and contrary to popular belief, do not select the 0.004" or 0.005" gauge and try and "adjust" with one blade, you'll need two sets of clearance gauges, get the long bladed ones, and select 0.003" and 0.005" for the inlet valve and 0.004 and 0.006" for the exhaust valve Use the gauges as go no-go gauges....ie for a clearance of 0.004", the 0.003" gauge will slip under and the 0.005" gauge will not Enjoy  |
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