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Discussion Starter · #1 ·
I am trying to figure where all the oil is going in our cx. We took it for a 200km ride in the moutains and it burnt half the range on the dip stick e.g. from half full to empty on the cross hatching on the dip stick. The clutch would slip quite badly above 7000rpm if you gave your wrist a bit of a flick. Think i have the clutch slippage sorted, sticky cable, but was wondering if the plates would get hot enough while slipping to burn oil. Also do cx's ever suck oil out of the crankcase breather at high rpms, the foam peice in the air box was disintergrated when we got her going again and we replaced it with a circle piece of filter foam. I suppose after I ruled both of them out I could pretty saftely assume its rings or valve guides??? The only time its smokes is when im follwing and my dad gives it some revs, normally up a hill, not a big plume of smoke more of a constant haize untill he upshifted or backed off.
 

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Discussion Starter · #3 ·
we have adjusted the valves but did not do the valve guide seals. On a 80, 000 km cx500 would the guides need replacing or just the seals? Bear in mind this is a one owner bike, my old man, and he does not thrash engines, just sat for 15 years. Btw we still have the headgaskets and valve seals from the full gasket kit got.
 

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It's possible that after sitting that long , it may have a sticky oil ring thats causing the oil smoke. If it were smoking on deacceleration, it would tend to be valve seals leaking under hi vacum in the intake tract.Trying a lil Marvel mystery oil in the gas might be worth a try though, in case it is a sticky ring... sure worth a try! Good luck with it!!
 

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On most cx's, the oil scraper rings get tired way before the compression rings. You will find most of your oil goes to the airbox via the breather, they will run this way for 30-40,000 mls or more, I've seen some very tired cx engines and not very many blow lots of blue smoke from the exhaust. As long as you are aware that it uses more oil than you would like and check it often its not a problem. If you can't put up with it, new rings along with a bore hone will remedy this, the bores wear very little, the rings take most of the wear on these engines.
 

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Discussion Starter · #7 ·
When you first go to start the bike cold do you get a puff of white smoke from the exhaust?




Na no smoke when starting. as with the sticky oil ring, i might try some upper engine cleaner next time i change the oil
 

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Na no smoke when starting. as with the sticky oil ring, i might try some upper engine cleaner next time i change the oil


What mileage is on the engine?



Possible worn valve stem seal/valve stem guides.
 

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49000 miles


Then possibly as per above.I have a stack of heads in my garage that all have worn valve guides so if used on my engines will cause excessive oil use especially under-load.Gentle riding and under 60 mph there's no so much.

All the parts I have used have been abused by POs.We don't get a lot of low mileage examples over here.My now Main CX this year I bought new Valve stem guides,seals and valves and got them professionally fitted,the seats re-cut and ground-in.This bike now has an acceptable oil usage for it's age.Total cost was around £250 UK.

I could have risked an engine off Ebay but that's how ended up with loads of heads/spares so decided to pay the money and do a set of heads.

I have just this week received a set of low mileage(19,000 miles) Heads with valves etc from a US EbaY seller which I am going to fit to my Other CX which suffers the same.This was one third the price of getting another set of heads done.A slight gamble but if the seller is to believed they should cure that one.

This may not be your problem but just food-for-thought.



It's unfortunate that in some cases the engines have been abused,badly maintained by POs leading to premature engine component wear.The Valve guides like cranks are quite capable of doing well over 150,000 miles if looked after.



If you ever spot a low mileage engine going for a decent price buy it as a spares depot.



 
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