I recently purchased a 1994 SPX and it ran fine out of the water. Once we put in the water, it will start but has no power. It runs great out of water while on a stand but once it is in water there is nothing. It will run very rough and then die. There is no throttle response when it is "chugging". Have any of you had this problem before? Thanks a lot, DGI140
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94 SPX, Won't run correct in water....
- Thread starter dgi140
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timmyboy76
New Member
need to rip thru the fuel system, and carbs, but prior to that, do a compression check...everything sounds good out of water...:cheers:
robin savell lloyd
Active Member
:agree: reread post#2
robin savell lloyd
Active Member
Hopefully above 120 psi per cylinder
Do a compression test. Here is some information on it.
You'll need a compression tester. Go to Auto Zone. I think they sell for like $25.00. The compression gage, will screw in the cylinder head in place of the spark plugs. To test compression, remove both spark plugs. Place spark plug caps on the plug cap studs near the cylinder head to ground the empty caps. This completes the circuit of the ignition electrical system and prevents any electrical problems from the caps being un grounded. Using the correct adapter for the threaded end of the tester,( same length of the spark plug threads length)screw in the tester in one plug hole. Hold the throttle wide open. Push the start button. Watch the compression gauge, when it peaks out at the most compression, let go the start button. Read the psi number. I would do it 3 times to be sure it is accurate. Check both cylinders the same way. The ideal compression is 150 psi per cylinder. If it is less, it's not a problem as long as they are close to being the same. If the psi is less than 90 it might need be time for a tear down and a rebuild. If the psi in 1 cylinder is say 140 psi and the other is 80 psi you need to tear down and repair. This difference is a lot and there is a problem. I hope this helps you.
Karl
You'll need a compression tester. Go to Auto Zone. I think they sell for like $25.00. The compression gage, will screw in the cylinder head in place of the spark plugs. To test compression, remove both spark plugs. Place spark plug caps on the plug cap studs near the cylinder head to ground the empty caps. This completes the circuit of the ignition electrical system and prevents any electrical problems from the caps being un grounded. Using the correct adapter for the threaded end of the tester,( same length of the spark plug threads length)screw in the tester in one plug hole. Hold the throttle wide open. Push the start button. Watch the compression gauge, when it peaks out at the most compression, let go the start button. Read the psi number. I would do it 3 times to be sure it is accurate. Check both cylinders the same way. The ideal compression is 150 psi per cylinder. If it is less, it's not a problem as long as they are close to being the same. If the psi is less than 90 it might need be time for a tear down and a rebuild. If the psi in 1 cylinder is say 140 psi and the other is 80 psi you need to tear down and repair. This difference is a lot and there is a problem. I hope this helps you.
Karl
timmyboy76
New Member
dg...that aint good, pull head off, see if anything visible...
It is a 650. Thanks for all of your help. I think I found the problem. I am in need of a new piston and "jug" or cylinder sleeve. It looks like that the guy that sold it to me tried to rebuild it. Somehow, it looks as if there was a screw left in the cylinder. It did a lot of damage. I am checking with a friend to see if the sleeve can be smoothed out and just try to get a new piston. Do any of you know a cheap on-line used parts store? I do not want to sink much money in it due to the fact that it is a 1994. I am no mechanic but luckily I have a friend that is helping me out a bit.
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