[Dcarriker17]

Took my 91 I just bought apart and found the cylinder head had some chips near the valves but didn't seem to affect them. Except my exhaust valve leaks but does not leak where the chip is. What should I do Do I need a new head or can I get it fixed

 

[Dcarriker17]

Pics attached

 

[fishfiles]

I would say if you re-lap the valves you would be ok , check the valve stem for being straight and not bent -----can't imagine what caused that dent , did you have timing chain slack

 

[Dcarriker17]

I am getting new valves and no I did not Idk what could of done it either gonna get it checked out at the shop I take my stuff to see what they say. Hopefully just what you said is all I need

 

[retro]

It looks to me like the exhaust valve seat come loose in the head casting... so the previous owner staked it down with a flat-bladed screwdriver and hammer... so he/she could sell the bike for more than its worth. It could also be a screw that come loose and got ingested... but thats a long shot with gazillion:1 odds, cause I see where the flat-blade staking job dinged the valve seat inline with a stake. The person who did it was careless.

Regardless of what happened its a heavy oil burner and needs a complete top end rebuild, minimum. Good news is, you may be able to rebuild it for $600 or so...? Hope so, those old 300s may be the best bike Honda ever made...

 

[fishfiles]

Retro , I am usually with you 100% , but this time I am going out on the limb to say that is not a stake mark , they are two smaller marks also and no rhythm to the spacings of the mark , you would think if staking was the purpose of the marks , the stake would have used a pattern of a triangle or square ---------- I would guess the engine had a stretched out timing chain at one time , maybe the electrode broke off the spark plug , or it could have happen when the head was dropped or stored in a box when the engine was previous part ---- CSI New Orleans

 

[one1]

I'd tap that material back to the wall with a flatblade and dremel it so the valve seats. The hole is irrelevant if the valve seats. You'd end up with a tiny crack instead of a huge gap.

 

[misterclean59]

I think it was a foreign object that bounced around causing those dings. Don't worry about that. You could polish them out tho. I agree with Retro that the engine is worn out. I'd do a complete check and overhaul of the top end. You can ask us for details about that later when you have specific questions.

 

[retro]

CSI New Orleans ---- thats a great tag line!!! I'd better fall back and hush up... my record making calls from photos is terrible and its only getting worse. LOL

 

[Dcarriker17]

I am rebuilding the top end the cylinder is getting bored and new valves are ordered with a complete top end kit. Would y'all suggest just taking to a shop and getting it worked on or how could I do it at home

 

[Dcarriker17]

Took the head to the shop I use and they are gonna do a head service on it and get it all fixed up! I appreciate all the responses !! Thanks

 

[misterclean59]

Took the head to the shop I use and they are gonna do a head service on it and get it all fixed up! I appreciate all the responses !! Thanks

Good for you. Check the cam chain and sprocket while you're at it. This is a good time to clean the carb, tank, petcock, air filter, change oil etc.