09-04-2010, 08:58 PM #1
- Join Date
- Nov 2009
Will cracked exhaust manifold cause inaccurate compression readings?
Going to check out an '03 1300 with what the owner says is a cracked exhaust manifold. I assume that this will affect the compression check because it'll lose some back pressure. How do I check this thing out?
09-04-2010, 09:10 PM #2
it shouldnt the piston will be blocking the exhaust ports when its compressing at the top. If it didnt you wouldnt have any compression at all.
09-05-2010, 02:18 AM #3
+1 If the compression is off you got other problems with the motor. A cracked exhaust manifold will make the ski lose rpms but compression should be fine.
09-05-2010, 08:49 AM #4
if it turns out you need an exhaust manifold I have several
if you can't actually see the crack
if in fact it is cracked and leaking exhaust it will have a gdll grey dirty coating on everything in the vicinity
you should also try running it on a hose to see if there is a water leak
05-12-2011, 09:17 PM #5
- Join Date
- May 2011
- The Pas Manitoba, Canada
What would cause the exhaust manifold to crack? I have a gp1200r that ran great all last season and then one day I took it out and it was very very sluggish on mid to top end. I opened it up and saw water spraying from a crack in the manifold.
05-12-2011, 10:02 PM #6
05-12-2011, 10:16 PM #7
a cracked manifold will not cause low compression.
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