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CB550K - engine rebuild (partial or full)

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Bryanj:
Wont hurt, i think the book calls for 140 hot

K2-K6:
The video sounds quite noisy to me,  but more chain type than other.

As mentioned already,  difficult to fully appreciate remotely but the audio if anything seems fairly clear playing it here.

If you video it the same agian but stand it on the ground and in first gear,  then let the clutch out until it only just starts to bite. This may give an indication (if it goes quieter) of primary drive noise as it will tension it rather than oscillate.

It'll be interesting to hear if you get any change to the noise.

Erny:
OK, I can test this weekend and post here, so warm up, engage 1st gear, pull clutch that is starts to move bike, right? Will be difficult to have 3rd hand but will try  ;)

K2-K6:

--- Quote from: Erny on October 23, 2020, 11:42:32 PM ---OK, I can test this weekend and post here, so warm up, engage 1st gear, pull clutch that is starts to move bike, right? Will be difficult to have 3rd hand but will try  ;)

--- End quote ---

Fix camera pointing at bike, first gear not to drive along but only just get the clutch to start dragging but brakes on.  Should pre-load transmission and tension primary drive just enough to take out "flip flapping" would show if the chain is worn if noise gets less.

Erny:
Small progress today

Engine warm-up made (approx 8km):

1. Idling + test of noise change after gear#1 enagage:
you can clearly hear that idle is not 100% regular, there are moment engine rises revs, even I felt during ride on low RPMs like engine running on 3cyl only occassionally... This is new behaviour to me. It feels like I ususally feel after bike washing (I did 1 week ago), engine does not rev more than 6k (feels like ign issue)

- time 0:08-0:15 - clutch fully pushed
- time 0:28-0:36 - clutch fully pushed
=> Rattling seem dissapeared

- time 0:58 - backfire (pipe#2?) - this happens to me for the first time, probaly linked to cyl#2 too rich (as was unable to fix that since long time|

Video here: https://youtu.be/gwZVUlbaXo4

Plugs after removal - photo attached


Seems like rattling comes from worn primary chain?


2. Compression test (hot) - made after idling test above on warm engine. Using kick start only
- dry test : 130/125/115/125
- wet test : 150/145/160/145

the same strange behaviour of cyl#3 observed during cold test (dry/wet)... what It could indicate? Rings issue?

Honestly I'm not sure about quality and capabilty of my tester, during kicking gauge arm is jumping up/down, see video from wet cyl#2 test
https://youtu.be/ROmpTSJdKIU

3. Before reassembling tank back, I left engine idling to burn oild from cylinders and raised idle - seems rattling is reduced / dissapeared. Smoke from pipes is white }condended water as enogine cooled down meanwhile)
https://youtu.be/lmlRuv11XtM

Note: I start to suspect something with coils/HT cables/plug caps (new in 03.2019) due to that irregular idle. Ignition is Boyer, so no points, no mech advancer

Anyhing else I should do before engine disassembly?

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