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May 30th, 2011, 08:35 AM
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#1 |
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ninjette.org member
Name: Tony
Location: Surrey UK
Join Date: Aug 2010 Motorcycle(s): GPX250 + many others! Posts: 184
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Re-use old head gasket ?
Ok, Ok, I know, of course I shouldn't re-use an old head gasket, but I want to get the bike running in a hurry and it's a bank holiday here in the UK. I've carefully scraped the old gasket cement off, should I use a very thin smear of gasket sealant on it, try it dry, or am I doomed to failure ??
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May 30th, 2011, 11:28 AM
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#2 |
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GDTRFB
Name: Drew
Location: SE PA
Join Date: Nov 2010 Motorcycle(s): 2009 Ninja 250 - sold 2005 EX500R project Posts: 496
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Get a new gasket. Seriously...
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I don't want a pickle Just want to ride on my motorsickle -Arlo Guthrie |
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May 30th, 2011, 11:34 AM
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#3 | |
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ninjette.org certified postwhore
Name: Scott
Location: Carlise Ohio
Join Date: Apr 2010 Motorcycle(s): Yahama v star 650 classic Posts: A lot.
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Quote:
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May 30th, 2011, 03:28 PM
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#4 |
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ninjette.org member
Name: Tony
Location: Surrey UK
Join Date: Aug 2010 Motorcycle(s): GPX250 + many others! Posts: 184
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OK, thanks for the comments, it's going downhill anyway now, I need a special spanner for adjusting the valve clearances, and I may have made a mistake with the cam chain tension. I timed the cams up as per the manual, set the tensioner, but when turning the motor over, even slowly, the chain is going slack at the front and the ex cam is skipping.
Just off to bed with my factory manual, to re-read and see what I've missed 
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May 31st, 2011, 08:35 AM
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#5 |
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ninjette.org certified postwhore
Name: Frugal
Location: Dallas/Fort Worth (DFW)
Join Date: Mar 2010 Motorcycle(s): Several Posts: A lot.
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Just for clarity: Head gaskets typically have a metal "fire" ring at the combustion chamber. This ring is designed to crush to fit as the head bolts are torqued, and as such it stays permanently deformed. There is a high risk of failure of the fire ring when head gaskets are reused because it won't crush properly the second time around.
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May 31st, 2011, 08:42 AM
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#6 |
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IC2(SW)
Name: Kerry
Location: Pensacola
Join Date: Nov 2008 Motorcycle(s): . Posts: A lot.
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Think he's talking valve cover gasket.
Head gasket would just be too funny........ |
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May 31st, 2011, 02:46 PM
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#7 | |
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ninjette.org member
Name: Tony
Location: Surrey UK
Join Date: Aug 2010 Motorcycle(s): GPX250 + many others! Posts: 184
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Quote:
Cheeky sod, I WAS talking about the head gasket !!! I'm the eternal optimist, and I was in a hurry to get the damn back on the road. Going to try and order a head gasket tomorrow ....... |
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May 31st, 2011, 02:51 PM
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#8 |
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ninjette.org member
Name: Tony
Location: Surrey UK
Join Date: Aug 2010 Motorcycle(s): GPX250 + many others! Posts: 184
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You've got to bear in mind in 33 years of riding bikes and working on them, this is the first watercooled bike I've owned, (the other 40+ were aircooled), and often you could get away with re-using a head gasket. Triumph copper gaskets are the best, anneal them each time and re-use them ad infinitum.....
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May 31st, 2011, 04:03 PM
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#9 | |
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ninjette.org certified postwhore
Name: Frugal
Location: Dallas/Fort Worth (DFW)
Join Date: Mar 2010 Motorcycle(s): Several Posts: A lot.
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Quote:
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May 31st, 2011, 11:54 PM
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#10 | |
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ninjette.org member
Name: Tony
Location: Surrey UK
Join Date: Aug 2010 Motorcycle(s): GPX250 + many others! Posts: 184
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Quote:
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June 1st, 2011, 06:27 AM
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#11 | |
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ninjette.org certified postwhore
Name: Frugal
Location: Dallas/Fort Worth (DFW)
Join Date: Mar 2010 Motorcycle(s): Several Posts: A lot.
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Quote:
100HP/L was a big deal when manufacturers were able to obtain it reliably, much like 1HP/Cu.Inch was back in the muscle car days. To put it in context, at 150HP/L a 5.7L car motor would be making 855HP. That's a lot. The main way bikes do it is with RPM, since HP is a function of torque and RPM. Smaller motors can spin higher RPMs. |
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