bigboss_an
Member
- Sep 21, 2005
- 36
- 0
Hello Everyone,
I have been working on my kids' bike (2000 CR80) for a while now and can't find a solution so your help is needed.
Even after sanding down cylinder head and top of cylinder on a mirror with 800 and then 1000 sandpaper and installing three new head gaskets (with correct torque on cylinder and head) I still get coolant in the exhaust and excessive pressure in radiator. Bike is also very hard to start. It will only start when pushed down a hill and jump starting it. When it finally starts it runs terrible, especially at higher RPM's.
Is it possible for coolant to leak into the exhaust by means of a (hairline) crack in the head or the cylinder?
I'm now considering new studs and a fourth set of gaskets, but maybe I should be looking at the head or cylinder for leaks? I know that the older CR's are very finnicky with head gaskets, but I can't believe the problem is a leaking head gasket anymore. Is the coolant being forced into the exhaust because of exhaust gases leaking into the cooling system (which makes no sense, I know) or is it being forced out by the temperature and pressure in the cooling system itself? I must say that this happens before the engine even warms up so I can't believe it's an overheating issue either.
BTW; Crankcase oil is perfectly clean.
My son is desperate so your help is really appreciated. Thanks.
'Confused' Marc
I have been working on my kids' bike (2000 CR80) for a while now and can't find a solution so your help is needed.
Even after sanding down cylinder head and top of cylinder on a mirror with 800 and then 1000 sandpaper and installing three new head gaskets (with correct torque on cylinder and head) I still get coolant in the exhaust and excessive pressure in radiator. Bike is also very hard to start. It will only start when pushed down a hill and jump starting it. When it finally starts it runs terrible, especially at higher RPM's.
Is it possible for coolant to leak into the exhaust by means of a (hairline) crack in the head or the cylinder?
I'm now considering new studs and a fourth set of gaskets, but maybe I should be looking at the head or cylinder for leaks? I know that the older CR's are very finnicky with head gaskets, but I can't believe the problem is a leaking head gasket anymore. Is the coolant being forced into the exhaust because of exhaust gases leaking into the cooling system (which makes no sense, I know) or is it being forced out by the temperature and pressure in the cooling system itself? I must say that this happens before the engine even warms up so I can't believe it's an overheating issue either.
BTW; Crankcase oil is perfectly clean.
My son is desperate so your help is really appreciated. Thanks.
'Confused' Marc