Honda-SOHC

Ah that makes perfect sense. When you explain it like that the exhaust valve does sound like the culprit. Could it also be the inlet as well?
I might just redo the entirety of the exhaust valve, stem and guide, just to be safe.
Is it an easy job to change the guides yourself?

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Hey guys

After over 20 years sat rusting and feeling sorry for herself, I have finally got the old girl started! Very chuffed.

She runs really well, and sounds great with the 4 to 4 drag exhaust I made up.



Carbs are all synced and work great together.
She fires up straight off the kick even on a cold start.

 

However, I didn't think that my first engine rebuild would go smoothly and I do have a problem which im struggling to figure out.

The #1 cylinder is smoking quite a bit but only one the bike is fully warmed up. Nothing on cold idle or light revving from cold. Its a combination of blue and grey smoke and is definitely an issue.

Compression tests across all 4 cylinders :
1- 150
2- 155
3 - 150
4 - 158

After 5 mins of idle and revving these pictures are what I discovered:

Still image from a video I took.


End of the exhaust.


Exhaust valve.


Wet oil from the exhaust hole.


But the spark plug looks ok?






I've been reading reading checking and struggling to figure out what the primary cause may be.
 I'm running the carbs lean on 3 turns out due to the pods and 4-4 exhaust.

The previous topics on here point to leaking oil around the piston rings and leaking oil from the valve stem seals. But both are brand new.

I'm running an electronic ignition with brand new dr8es ngk plugs and ngk caps and leads.

Any ideas at all?

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Well all I can say is - balls!

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Ah. The repaired one is on the underside of the bike, and not beneath the points cover where I think you're referring to. That one fortunately went on ok. Does that change it?

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Looking good. Are they bullet holes on the tank?

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Hi Mace

Great job so far keep it going. Two questions - what shocks are you using and then who did your seat cowl( loving it)



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Thanks. I built the seat myself from sheet steel and tube bars in a ring roller. I then welded it together and put two 6mm bolts on the underside. It was the first time but I'm happy with the overall stance of the seat.

I'm afraid that I can't remember for the life of me where I got those rear shocks. I think I got them back in 2012 so my memory has failed me on that one!

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So I bottled the custom bracket idea. I fitted up a test one and I wasn't happy with it.



So I did this instead.







Oh and I assembled the engine casings to get a feel for what the colours will look like in the frame. Bear in mind the unpainted will be painted black one I have it overbored.





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