much carbon on intake valves

Discussion in 'Mechanic and Repair' started by metro-hp_48, Apr 25, 2004.

  1. metro-hp_48

    metro-hp_48 LawnSite Senior Member
    from TN
    Posts: 874

    Just ordered the gaskets, ect. that I will need, and getting everything ready to put it back together. (lapping the valves now)

    Question: This motor has low hours, but there is an excessive amount of carbon built up on both intake valves. Is there something to prevent this, or is this just nomal? (Kaw FH500V)

    Also, if anyone just happens to know the valve lash, and what the head bolts torque on, it would be most helpful, and much appreciated. (thankz)

    *did switch to full synthetic sooner than I might should have, but other than that, it's maintained to the letter+. (not that full synthetic would have any effect)

    Switching to NGK........hear they work alot better than the Champions....any thoughts?
     
  2. grass_cuttin_fool

    grass_cuttin_fool LawnSite Gold Member
    Posts: 3,504

    I get better results from champions than Ngk. Years ago when I raced motorcycles the NGK was the boss
     
  3. barnard

    barnard LawnSite Senior Member
    Posts: 618

    I agree with grass cuttin fool . GCF MX, flat track or road racing? Did the MX thing,myself with a few cross countrys(hare -n-hounds) in the old days with alittle 1/4 mile flat trackin.
     
  4. metro-hp_48

    metro-hp_48 LawnSite Senior Member
    from TN
    Posts: 874

    Anyone know where I can find online, what the valves lash on, and head bolts torque on? Have been looking, but no luck yet.
     
  5. fixer67

    fixer67 LawnSite Silver Member
    Posts: 2,100

    I work in a small engine shop and see this all the time. The number one reason for carbon build up is engine overload. I have seen people try to cut 3 foot tall grass in 6th gear or try it at quarter throttle. When a engine is at work it needs to be at 100% throttle. If the ground speed is too fast on a rider gear down but leave the throttle at full. The number two reason is carb out of adjustment. The 3rd reason is clogged air filter. And last I would have to say is the engine is too small for the job or all of the above. Now I am not saying these are the only reasons but I would start with these.
     
  6. metro-hp_48

    metro-hp_48 LawnSite Senior Member
    from TN
    Posts: 874

    Let a real good friend use it for 1 yard, and I could not believe he was running 4th through thick, tall grass. Atleast it wasn't wet. (LAST time I let him use it)
     
  7. barnard

    barnard LawnSite Senior Member
    Posts: 618

    The number one reason for carbon build up is oil consumption either past the rings or thru the valve guides.
     

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