Wocka wocka wocka!

[R1]

I'd love to melt this thing down and make bullets out of it right about now.

The engine is well beyond the plastigauge part. This thing is ready to.....no wait.....this thing *was presumably* ready to rock until I checked the plugs after manually rolling the crank.

No other clearance issues other than the plugs and I imagine that's related to the crown on the top of the pistons. The new slugs are much different then the OEM ones so it is, in part, not really a surprise that this has occurred.

you know where the keys are

[butcher bergs]

you know where the keys are

You guys gonna be upset when you come back and find both bikes have been safety wired and race-numbered?

[R1]

no ill be upset if she wont let me do penguin and utilize the newly prepped bikes...

[butcher bergs]

I mean, I DO have that brand new spool of safety wire........

[Kurlon]

What plugs does that motor call for?

Edit: NGK-R0409B-9 or R0409B-10 would do the job, and is recommended by NGK for your application. The R0045Q is suggested as well, is a true surface discharge unit but costs more than twice as much.

http://www.ngksparkplugs.com/docs/racing_catalog.pdf

[butcher bergs]

Everything right down to the AMA documentation I read during my research suggested that the IMR9's were suitable so that's the plug I went with.

Some other thoughts I had were that someone might've planed the head but I think I would have noticed the machined surface as well as the fact that the valves are not contacting the pistons in all this and judging by what I saw, I'd say it's the the first time ever this motor has been apart.

As much as I hate to type this, I think my only real choice is to have the piston dimensions checked and go from there.

The build from hell I tell ya!

[CBR929RE]

I'm pretty sure you would have noticed this but I'll ask anyway. are there crush washers on the plugs? if they are missing for whatever reason maybe that's where your missing clearance went.

[butcher bergs]

Crush washers? I thought those were free key rings!


Yes, the spark plug crush washers were present, as was the head gasket....just in case anyone was wondering.

[Kurlon]

What are you running for squish?

[butcher bergs]

It's nothing to do with squish....trust me.

[Paul_E_D]

Do the threads on the plugs protrude into the chamber? or are they flush except for the wires?

[SVRACER01]

Wirelessly posted (Instinct: Mozilla/4.1 (U; BREW 3.1.5; en-US; Teleca/Q05A/INT))

Do you know what youre doing or are you reading along on the internet?

[seth399]

Not to be a wet blanket, or maybe I am missing out on an inside joke, but wont an engraving on the top of the piston cause some localized hotspots (corners/edges), and some potential issues down the road?

some stock pistons come with crap on top. My yz pistons have part# on top, an arrow for front and STD etc..

[Kurlon]

some stock pistons come with crap on top. My yz pistons have part# on top, an arrow for front and STD etc..

Where are you getting your pistons, crack whores in back alleys?!

[seth399]

Where are you getting your pistons, crack whores in back alleys?!

theys cheaper when I buy them from the alley!

[butcher bergs]

Do the threads on the plugs protrude into the chamber? or are they flush except for the wires?

Gonna be pulling the head off to check all that.

Thing is these plugs, and this build in general, isn't anything special. The IMR9 plugs are optional as far as the Honda factory is concerned but they are the recommended plug for this application from everything I was able to dig up. Obviously I can get the "crazy plugs" but I don't have $115 for spark plugs in light of my house purchase.

Do you know what youre doing or are you reading along on the internet?

Oxx, this isn't my first prom. My only variable all along has been the pistons. Everything else is more or less a direct OEM replacement.

[Kurlon]

Oxx, this isn't my first prom. My only variable all along has been the pistons. Everything else is more or less a direct OEM replacement.

Those pistons aren't just drop ins, those are some precision slugs designed for maximum squeeze, you've got to manually set the squish/deck height on them even assuming all else is bone stock. (That would also explain why the plugs are just kissing the pistons but you've got plenty of valve clearance, they're expecting wilder cams.) Even if you were doing a totally OEM build I'd tell ya to check squish and deck height along with all the other clearances, standard supersport build practice to dial them in.

[Doc]

damn this thread title

I keep thinking fozi bear is gonna pop up....

kinda like your "new bike" thread

[butcher bergs]

Those pistons aren't just drop ins, those are some precision slugs designed for maximum squeeze, you've got to manually set the squish/deck height on them even assuming all else is bone stock. (That would also explain why the plugs are just kissing the pistons but you've got plenty of valve clearance, they're expecting wilder cams.) Even if you were doing a totally OEM build I'd tell ya to check squish and deck height along with all the other clearances, standard supersport build practice to dial them in.

Trust me when I tell you that everything has been checked and set to within tolerance. I'm not publishing my numbers anywhere.

[Kurlon]

Trust me when I tell you that everything has been checked and set to within tolerance. I'm not publishing my numbers anywhere.

Ah, fair enough. (Damn, so much for building a bike JUST faster than Bergs by setting MY tolerances .00005" tighter...) Weird then, I would expect the plug relief to be cut by the same CNC program that does the rest of the piston crown, you'd think if the CNC was off all of it would be.

[butcher bergs]

We'll see once the top end comes off and the pistons are send out.

[butcher bergs]

Wow. I suck. I won't even need to send the pistons out because I went 0 for 4 on installing them.

My only excuse is I was drunk.

At least it's an easy fix......




They say there's a first time for everything.....

[obsolete]

What did ya do?

[Kurlon]

Did you put them in backwards?

[seth399]

you put 2 pistons in each cylinder...duh!!