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Author Topic: 1969 Honda Cub 90 (CM91) - Almost Done (hopefully)  (Read 16425 times)

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Offline CBJoe

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Re: 1969 Honda Cub 90 (CM91) - Up and Running (mostly)
« Reply #75 on: August 03, 2019, 04:25:46 AM »
Yessir...I can check the valve clearances again.

Hope your right about the smoke.




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'07 Bonneville Black
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CB750K2 Hot Rod Revival http://forums.sohc4.net/index.php/topic,171693.0.html
'65 CB77
'66 CM91 (C90'ish)

Offline CBJoe

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Re: 1969 Honda Cub 90 (CM91) - Up and Running (mostly)
« Reply #76 on: February 01, 2020, 03:37:51 PM »
3rd go...top end coming off again to see why it’s burning oil...pretty sure I damaged the exhaust guid seal...so new one going in.




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'07 Bonneville Black
'15 Moto Guzzi California 1400
CB750K2 Hot Rod Revival http://forums.sohc4.net/index.php/topic,171693.0.html
'65 CB77
'66 CM91 (C90'ish)

Offline CBJoe

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1969 Honda Cub 90 (CM91) - Up and Running (mostly)
« Reply #77 on: February 01, 2020, 05:30:02 PM »
Verified the exhaust guide seal leaking....theres evidence of wet oil on the valve below the seal.



But another bad thing is....(as david guessed) I likely didn't have the lash set correct...and the rocker faces have some damage...cam lobes look good though.



new rockers ordered.  All else looks good.
« Last Edit: February 01, 2020, 05:34:00 PM by CBJoe »
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'07 Bonneville Black
'15 Moto Guzzi California 1400
CB750K2 Hot Rod Revival http://forums.sohc4.net/index.php/topic,171693.0.html
'65 CB77
'66 CM91 (C90'ish)

Offline CBJoe

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Re: 1969 Honda Cub 90 (CM91) - Almost Done (hopefully)
« Reply #78 on: February 17, 2020, 12:00:22 PM »
Replaced the Rocker Arms, Exhaust Valve Guide Seal, Adjusted lash and timing. Fresh ethanol free gas and cleaned out carb.  So far so good.  I let it idle for about 10mins and no sign of smoke.  Just water vapor as its very damp and cold outside. 


Need to:
- Change Oil
- Check Cam Chain Adjustment
- Button up small items and hopefully its good to go to just park and ride around

Joe
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'07 Bonneville Black
'15 Moto Guzzi California 1400
CB750K2 Hot Rod Revival http://forums.sohc4.net/index.php/topic,171693.0.html
'65 CB77
'66 CM91 (C90'ish)
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