I have a feeling something is wrong
Senior Member
Joined: Jul 2010
Posts: 1,414
From: Missouri
1st Gear Member
Personally i would check the head with a machinists square and feeler gauge for warpage before you stick it all back together.
At least set it on a nice flat surface (like a piece of quality glass) and see if it has any perceptible wobble.
At least set it on a nice flat surface (like a piece of quality glass) and see if it has any perceptible wobble.
Senior Member
1st Gear Member
Joined: Sep 2010
Posts: 695
From: Western NY
The head gasket is blown between the 2 smaller (ex) valves into the water jacket. this explains the hissing noise you were hearing. I would take the head to a machine shop and ask if it can be shaved (planed) Find out what the ring end gap is supposed to be and check it at the top of the cylinder.
I don't think the starting problem has anything to do width this problem.
Can you get a picture of the piston skirts? And another one of the thermostat from a different angle?
Head gasket
Cylinder gasket
Thermostat and gasket
Valve cover gasket
New oil and antifreeze.
Oil Filter
So far.
Best of luck
David
David
I don't think the starting problem has anything to do width this problem.
Can you get a picture of the piston skirts? And another one of the thermostat from a different angle?
Head gasket
Cylinder gasket
Thermostat and gasket
Valve cover gasket
New oil and antifreeze.
Oil Filter
So far.
Best of luck
David
David
Senior Member
Joined: Sep 2009
Posts: 5,050
From: Abilene, TX
1st Gear Member
dacoontz, it really looks like a simple head gasket failure, but while you have the head and cylinder off, it will be easy and cheap to insure the mating surfaces there are nice and flat without warpage from heat...or the problem with the head gasket in the first place. Some will tell you that you can do it at home with a straight edge and such, but unless you're fairly experienced, it's worth having an expert look at it. Take it to a very good motorcycle shop with some engine building experience, or better yet, take it to a machine shop. A machine shop makes its living insuring the surfaces mate and match without issue and have the tools to check for such. This may sound complicated, but it's easy to find a good machine shop or such to really check for warpage. You could probably put that back together with a new head gasket and rings and probably be OK, but why not be sure. Heat can do bad things to flat surfaces sometimes. Is it time for a big bore kit?
On your starting issue, yes, it could be tight valves or one or a combination of several small factors. Before you pulled the cams, you did check the clearances, didn't you? Have you drilled the starter jet on your carb?
On your starting issue, yes, it could be tight valves or one or a combination of several small factors. Before you pulled the cams, you did check the clearances, didn't you? Have you drilled the starter jet on your carb?
Thread Starter
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Senior Member
Joined: Jan 2008
Posts: 255
1st Gear Member
How should the thermostat sit in their and does the angle really matter?
I think you have some luck on your side. You've blown the head gasket and run her dry with a faulty thermostat and still have a serviceable bike.
These shots clearly show the blow by from the cylinder into the water jacket Just above the exhaust port.. New head gasket for you my man.
Looks like there has been little or no contamination of the oil (very lucky) and despite the faulty thermostat and the "cook up," the head, valves and cams haven't suffered.
Fit it all back up together with new thermostat, top and base gaskets, fresh oil, filter, and coolant and it should run sweet.
Just read Larrys post and looked at the pictures again, and I too agree that some new rings are in order so add them to the parts list.
BTW, do you have a service manual? I ask because I've shared around plenty of copies to guys on the forum (PDF file.) Just askin'.
As for rebuilding the carb'. If it aint broken, don't fix it! Maybe fix up the cylinder first, and get it running before you look into the carb.
Could have been much worse. You'll be back on the road by the weekend if you get the parts today.
These shots clearly show the blow by from the cylinder into the water jacket Just above the exhaust port.. New head gasket for you my man.
Looks like there has been little or no contamination of the oil (very lucky) and despite the faulty thermostat and the "cook up," the head, valves and cams haven't suffered.
Fit it all back up together with new thermostat, top and base gaskets, fresh oil, filter, and coolant and it should run sweet.
Just read Larrys post and looked at the pictures again, and I too agree that some new rings are in order so add them to the parts list.
BTW, do you have a service manual? I ask because I've shared around plenty of copies to guys on the forum (PDF file.) Just askin'.
As for rebuilding the carb'. If it aint broken, don't fix it! Maybe fix up the cylinder first, and get it running before you look into the carb.
Could have been much worse. You'll be back on the road by the weekend if you get the parts today.
Thread Starter
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Senior Member
Joined: Jan 2008
Posts: 255
1st Gear Member
I would not worry about the flat side on that elbow. The seal is not made by the whole fitting only the innner discolored part. You should be good but I would recomend you evenly torque all three bolts in steps when you put it back together. If you torque 2 of them down all the way with little to no torque on the third you can **** the fitting a little and less sealing pressure will be applied near the third bolt even if they all have the same final torque.
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dan888
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