I'd like to know the cause of this. Intakes ? I'd look for this brown stuff I mentioned. It has stopped quite a few Honda lawn mower engines over in the PE division. You can clean guides with a .22 bore brush (brass). If I remember correctly the size is 5.5mm. MMO keeps this from happening. Short of additive deposits, check for galling. This is a first. Keep me posted as to what you find. Not unusual, unheard of.
--- On Wed, 8/5/09, Creative Residential Designs <[email protected]> wrote: From: Creative Residential Designs <[email protected]> Subject: [Nighthawk Lovers] Re: Stuck/warped exhaust valves.. To: [email protected] Date: Wednesday, August 5, 2009, 2:06 AM I apologize...it was 2 intake valves that are warped (the big ones..) and not in the same cylinder. One was only going part way up creating a tap-tap and one was completely stuck. I think that the one that was only partly sticking was the noise that's been there since I bought the bike. That one was also in the cylinder that was leaking oil and may have been the cause of that. I will clean everything with carb cleaner of course before re-assembly. I can see no other damage to the motor. ----- Original Message ----- From: Dennis Hammerl To: [email protected] Sent: Tuesday, August 04, 2009 10:46 PM Subject: [Nighthawk Lovers] Re: Stuck/warped exhaust valves.. I'm having a tough time with this. Did they strike the pistons ? Evidence of galling in the guides ? Valves do not bend without contact with a piston. A very unusual failure given the care you give the bike. Any chance of close-up pix of these ? You never replied about losing a cylinder at time of noise, I'll assume you did. Both in same cylinder ? A loose guide that passes oil does not stick it's valve. There is a condition that occurs in some motors now that is fuel related. The intake valves stick because of a deposit of a fuel additive that gums up the guides. Invert the head and spray carb cleaner or oven cleaner down the guides and allow it to drip into a clean white cloth. The deposit is a dark brown color and very stubborn to remove. This has not happened to exhaust valves. Have the guides cracked as well ? I'm very curious about this. Failure is a PITA, cause is vital. --- On Tue, 8/4/09, Creative Residential Designs <[email protected]> wrote: From: Creative Residential Designs <[email protected]> Subject: [Nighthawk Lovers] Stuck/warped exhaust valves.. To: [email protected] Date: Tuesday, August 4, 2009, 2:25 PM Well gang I finally got my answer to my engine problem. I have 2 warped exhaust valves. It's off to order parts.....HotrodMamma. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en -~----------~----~----~----~------~----~------~--~---
