Author Topic: I think I've done something wrong!  (Read 8483 times)

Offline McCabe-Thiele (Ted)

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Re: I think I've done something wrong!
« Reply #45 on: October 22, 2024, 10:49:46 PM »
I'm the same, I don't like doing valve clearances so do my best to get each one spot on first time.
Honda CB400NA Superdream (current money puddle)
Honda CB500 K1 (second money pit)
https://www.sohc.co.uk/index.php/topic,28541.0.html
Honda CB400 four super sport (first money pit)
Link to my full restoration http://www.sohc.co.uk/index.php/topic,23291.0.html
This is a neat 500 restoration in the USA.
http://forums.sohc4.net/index.php/topic,151576.msg1731556.html#msg1731556

Offline SeanFD

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Re: I think I've done something wrong!
« Reply #46 on: July 04, 2025, 11:01:23 AM »
Well, since last time ....

Everything went back together, but an electrical gremlin prevented me from trying to start the engine. So after spending Xmas at home in France, I continued my RTW trip to Belfast(s).

belfast2belfastbybike.com) for anyone interested

I have now done NZ and Oz, then got held up by the Pakistan/India dispute, spent 2 weeks on little hired bikes with my sons in northern Pakistan, and now, because of the Israeli action in the Middle East, my 750 is being stored in The Bikers Cafe, Dubai

https://www.facebook.com/search/top/?q=bikers%20cafe%20dubai If you're in Dubai, pay a visit; the food is great and the strawberry milkshake wonderful!  :)

However, every cloud ....  This delay allowed me to return to Rusty the 400F2.

Without too much effort the engine started, but it was lumpy.  The oil pressure light didn't go out either, and then I realised I hadn't put any oil in after the last episode!  :-[. The carbs were overflowing. and the throttle grip was sticking.

So I removed the carbs, cleaned and blew through the jets, did a bench synch leaving the slides at 3mm using the idle screw, set float heights at 21+/- (range 20,5-21,5) and replaced them - what a job replacing them is! I removed the powder coating from the right handlebar and the grip started moving much more freely.

Rusty fired up with the first prod of the starter  :D, responded well to the throttle but wouldn't drop below 4000. She started several times with the same result.

https://youtube.com/shorts/jydaCl9nJXU?feature=share

Checking the plugs, 1, 2 & 4 were clean, but No 3 was black. I unscrewed the idle screw fully, and reset the air screw at 2 turns out - they were at 4 turns out!

The bike wouldn't start! There was a good spark, and fuel seemed to be getting through. At this point I noticed that the starter spun much more freely when the kill switch was off, and there was an unsettling noise from the engine when it was on. I was about to start from scratch with checking the valves and timing when I noticed some oil on the floor  :o There was a hole in the clutch cover; the bolt retaining the secondary drive gear had come loose and punched it's way through the crankcase!

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Sorry for the biblical length of the post, but a few clear questions:
  • Apart from the hole in the crankcase, what damage might the loose bolt have cause?
  • I plan to try to fix the hole with JB Weld Extreme Heat; any thoughts?
[li] What can I now do the get it running again (once the hole is repaired)? Go through the usual suspect list of valves, timing and carbs  :( ? Or is there something I have forgotten?
[/li][/list]
CB750 K2 - Ridden from Belfast(SA)-2-Belfast(NI) & Belfasts, N America!
CB750 K1 - The less, said the better!
CB450 K1 - A work in progress.
CB400F Supersport - Rusty - not any more!

 

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