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Post by almar on Mar 5, 2023 11:03:11 GMT
I am planning on stripping the clutch on my CB400 and doing a rebuild. Before removing the casing I am wondering what the large silver cap with the groove is. There is no mention of it in my workshop manual. Does it need to be removed before removing the casing. What is behind it? Any help is appreciated.  |
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Post by andy1kenobe on Mar 5, 2023 11:54:06 GMT
It's for the balance chain to be adjusted.
In my Haynes it's described on page 11, routine maintenance, bottom right of the page, Nine monthly or every 10,000 miles section.
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Post by almar on Mar 5, 2023 13:11:52 GMT
Thanks.
I presume, in that case, I can simply ignore it and remove the whole casing?
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Post by duffer on Mar 5, 2023 13:27:46 GMT
You can. I also suggest that you leave the clutch connected, undo ALL the 8mm bolts, then pull the clutch in. That will then split the case from the engine without a load of banging and fiddling with screwdrivers (Which you should never do).
If you drain the oil while it is on the main stand first, then remove the cover whith it on the side stand. Reduces oil spill.
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Post by almar on Mar 5, 2023 16:10:34 GMT
Thank you again.
I particularly like your suggestion re separating the casing and will certainly try it.đź‘Ť
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Post by almar on Mar 8, 2023 9:51:18 GMT
Many thanks for the tip re reconnecting the clutch to separate the casing. It worked well once I managed to remove the one mangled nut that was thoroughly rounded.🤬🤬
New springs ordered as they were below minimum service length, also new clutch cable as old one’s outer perished and cracked. I have also bought a complete set of casing bolts to replace the old ones.
While the oil was drained I have changed the filter too.
Looking forward to being able to reassemble and test.
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Post by johnjones on Mar 8, 2023 14:19:45 GMT
Whilst the clutch cover is off you may as well check the clutch plates, attend to balance chain needs and flush out the crank case "sump"...you have the peg spanner ?
Use what's on bike to "lock" the gearbox input shaft...
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Post by almar on Mar 8, 2023 18:45:17 GMT
Thanks.
I have done all of those things. Plates are well within spec although the springs are below spec. The balancer chain tension has been done and the casing cleaned of sludge etc. I have ordered a clutch plate lock nut socket in order to torque it up, and ordered a new clutch cable while I am dealing with it.
All items have been despatched except the springs which I am currently chasing as they were invoiced on 6th March.
I am certainly learning about the bike thanks to the help and advice received from Forum members.
I am sure I will need further advice. e.g. the left cylinder is running lean. How do I adjust the mixture on the carb?
Fingers crossed in the hope of advice. My Haynes manual doesn’t help a lot in identifying the correct screw to adjust.
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Post by buster on Mar 9, 2023 5:52:56 GMT
if its lean on one cylinder I'd check the inlet rubber and its seal first job, the mixture screws are the ones on the underside of the carbs at the inlet side, very small adjustments can have quite major effects
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Post by almar on Mar 9, 2023 19:24:36 GMT
Thanks, will check the seal as recommended.
I have located the mixture screw.
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Post by almar on Mar 16, 2023 17:15:38 GMT
The springs arrived and the clutch has now been rebuilt and it is working well. Gradually getting to grips with the bike and rectifying the faults.
Need to adjust the mixture on the carbs now, or replace the intake rubber on the carb, if it is split, and the major mechanics should be done. I can then move on to tidying up some bits which can be improved cosmetically.
Thanks to the Forum and its members for the advice to date.
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