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[twistedrcpilot]

I need help diagnosing a problem. 

Here is my setup, VTX 1800neo, PC3 w/zero map, factory airbox, factory exaust w/ baffles removed(catalitic still intact), 1300 rear end and a CT out back. I've only got 12000 miles on it.

Stealer said I had piston slap.  They replaced the pistons and cylinders.  Everything is fine now.  The reason I brought it in is it sounded like a disel.  What causes this issue, and how can it be fixed so this doesn't happen again. 

Could it be idle?  I noticed now it idles about 1200, before was closer to 850. 

Is there any notification of oil pressure.

A/F mix pissibly?

I'm kinda lost here. Please help.

[j1mmyj4m]

Well, I know that some will drop the idle so it has more of a lope.  That will eventually damage the engine if you start hearing a slight pinging noise.  You're effectively messing with the detonation.  If you hear that noise then bump it up enough so that it stops.

I can't say if that's what actually caused your problem because it's so rare that these motors have to be dug into.  I think you and Gabe's new bike he got from Ron are the only two I've seen that needed to be taken all the way down.

[tom cat]

I have read about people claiming their PC3 failed. It dumps way too much gas washing oil out of the cylinders. See Kevin's post about how his PC3 killed his bike on VTXOA.

[RocknRoll]

I think Dusty had a similar problem that he healed somehow.  Maybe he will see your post and share his wisdom.

[RedDragon]

  I think you and Gabe's new bike he got from Ron are the only two I've seen that needed to be taken all the way down.

Out of all the honda's made and only two sake partys at the plant!

[POGOGOLF]

  I think you and Gabe's new bike he got from Ron are the only two I've seen that needed to be taken all the way down.

Out of all the honda's made and only two sake partys at the plant!

Unfortunately soon to be three....got a suspected cam bearing issue that needs attention. When you fire it up and let off on the throttle, I hear a metallic "thud"/"clunk" sound, if I give it a little gas, it stops; but sitting on it and dropping it into gear and easing off the clutch (w/ the front brake engaged of course), you can hear it as well. Such is life, think I'[ve found a reliable wrench here...I guess I'll find out soon enough?!

[twistedrcpilot]

That's how mine started.  then the metalic tud/tick became constant but only at idle and about 2500 rpms.  other than that is was quiet.  Compression got very low....to the point where I could acutally push start it.  Honda covered the parts (cylinders, pistons, etc) and labor.  I had to pay for diagnostic and teardown time. Seemed kinda crappy, but what can ya do?

 

[RedDragon]

  I think you and Gabe's new bike he got from Ron are the only two I've seen that needed to be taken all the way down.

Out of all the honda's made and only two sake partys at the plant!

Unfortunately soon to be three....got a suspected cam bearing issue that needs attention. When you fire it up and let off on the throttle, I hear a metallic "thud"/"clunk" sound, if I give it a little gas, it stops; but sitting on it and dropping it into gear and easing off the clutch (w/ the front brake engaged of course), you can hear it as well. Such is life, think I'[ve found a reliable wrench here...I guess I'll find out soon enough?!

Sorry to hear that Jeff.

So much for your bulletproof engine comments Brock! 

[POGOGOLF]

  I think you and Gabe's new bike he got from Ron are the only two I've seen that needed to be taken all the way down.

Out of all the honda's made and only two sake partys at the plant!

Unfortunately soon to be three....got a suspected cam bearing issue that needs attention. When you fire it up and let off on the throttle, I hear a metallic "thud"/"clunk" sound, if I give it a little gas, it stops; but sitting on it and dropping it into gear and easing off the clutch (w/ the front brake engaged of course), you can hear it as well. Such is life, think I'[ve found a reliable wrench here...I guess I'll find out soon enough?!

Sorry to hear that Jeff.

So much for your bulletproof engine comments Brock! 

Thanks, bro...it is what it is I reckon...never seen a "bulletproof" machine myself?!

[bluestreak]

That's how mine started.  then the metalic tud/tick became constant but only at idle and about 2500 rpms.  other than that is was quiet.  Compression got very low....to the point where I could acutally push start it.  Honda covered the parts (cylinders, pistons, etc) and labor.  I had to pay for diagnostic and teardown time. Seemed kinda crappy, but what can ya do?

Can't say for sure but it sounds more like you had a problem with the decompression starting circuit than piston slap.  "Piston slap" is a term given to excessive piston to cyclinder wall clearance in an engine. Unless you had 100K plus miles or you operated the bike with no air filter on it for a long time, I find it VERY hard to believe the cylinders were worn out. Much more likey the decompression circuit was hanging open and you nwere losing compression as a result.  The fact the sound was gone or reduced with engine speed, supports the decompression mechimisum............ not excessive piston/cylinder clearance. 

[bluestreak]

Well, I know that some will drop the idle so it has more of a lope.  That will eventually damage the engine if you start hearing a slight pinging noise.  You're effectively messing with the detonation.

The noise you may or might hear if the idle is reduced to a point of loping............... is defintley NOT detonation. It's just a rough slow idle due to the fact there isn't enough flywheel mass to carry the rotating crankshaft/assembly to the next combustion cycle smoothly.

[j1mmyj4m]

I'm not referring to the loping sound...I'm referring to the pinging noise.  Every VTX that I've heard that gets WAY too low to where it sounds like it's just barely running, has a pinging/ting noise like dropping a quarter on metal.

[Gumbo]

I'm not referring to the loping sound...I'm referring to the pinging noise.  Every VTX that I've heard that gets WAY too low to where it sounds like it's just barely running, has a pinging/ting noise like dropping a quarter on metal.

  Alright Bluestreak rebuttle please

[twistedrcpilot]

That's how mine started.  then the metalic tud/tick became constant but only at idle and about 2500 rpms.  other than that is was quiet.  Compression got very low....to the point where I could acutally push start it.  Honda covered the parts (cylinders, pistons, etc) and labor.  I had to pay for diagnostic and teardown time. Seemed kinda crappy, but what can ya do?

Can't say for sure but it sounds more like you had a problem with the decompression starting circuit than piston slap.  "Piston slap" is a term given to excessive piston to cyclinder wall clearance in an engine. Unless you had 100K plus miles or you operated the bike with no air filter on it for a long time, I find it VERY hard to believe the cylinders were worn out. Much more likey the decompression circuit was hanging open and you nwere losing compression as a result.  The fact the sound was gone or reduced with engine speed, supports the decompression mechimisum............ not excessive piston/cylinder clearance. 

Would that cause extreme scaring of the piston?  It look like a dirtbike piston after 2 years of racing.  All of the cross hatching was gone.

[twistedrcpilot]

Do these machines actually have a decompression mech.?