Crank case exhaust oil blowing

[Joe Vandal]

My 98 supercharged Valk has been blowing out oil from the crank case exhaust. It has a K&N filter that now sits on top of a short (2") hose that is attached to the crank exhaust. Oil does not seem to come out until you get a little aggressive with the throttle. Anyone have any clue to what might be the cause of this and how to resolve the problem?

[Jeff K]

Sure do!
Three broken pistons on the left side of the motor.
No doubt in my mind.  

Second land on the bottom of the piston as it sits in the bore.

[Bob E.]

Sure do!
Three broken pistons on the left side of the motor.
No doubt in my mind.  

Second land on the bottom of the piston as it sits in the bore.

Sounds like a man who speaks from experience...

[Jeff K]

Sure do!
Three broken pistons on the left side of the motor.
No doubt in my mind.  

Second land on the bottom of the piston as it sits in the bore.

Sounds like a man who speaks from experience...

You got that right. I have seen more than my fair share of broken Valkyrie pistons.

[Joe Vandal]

How expensive / tough of a fix is it?

[Jeff K]

Big job. Split the case. Buy new forged pistons.
Cost? Is this something you'd do by yourself. Or pay a shop to do it?


Where do you live?

[Joe Vandal]

possibly myself

[Jeff K]

How many miles are on the motor?
You can quite possibly replace the pistons without having to bore the block.

It's also a nice time to back cut the transmission.

[Joe Vandal]

32k on the motor.

[Jeff K]

32k on the motor.

Most likely could just do with std. bore pistons

[Joe Vandal]

Is there a performance piston that could be put back in? Do you have any recommendations?

[Jeff K]

Is there a performance piston that could be put back in? Do you have any recommendations?

JE will make a set of forged pistons. I have the specs, if they don't have them on file.

[fstsix]

Is this oil dripping to the ground or just minor seepage around small filter?.

[Joe Vandal]

The oil spits from the crank exhaust filter when you get aggressive at all with the throttle.

[fstsix]

You changed your oil lately or added oil maybe over fill?. I have had the hose clamps loose on Breather before and had some seepage oil after ride before but it was not coming out of the actual breather it was coming from the rubber hose under the breather. Can you tell its coming from the fiber area?.

[Joe Vandal]

You can see the oil spitting / bubbling at the base of the filter when you rev the engine. The hose is clamped tight at the filter and the engine breather.

[fstsix]

Dam!! Do you have Dyna 3000 with retard set? And did you hammer it hard just curious? before this happened.

[Patrick]

As Jeff stated, this appears to be somewhat common on blower equipped  engines.. Since the damage is to the left side pistons I've always thought it was due to  manifold baffling problem..What kind of blower speed do you have?? I've always wondered whether engines with lower blowers speeds/pressures had higher survival rates..

[Jeff K]

You changed your oil lately or added oil maybe over fill?. I have had the hose clamps loose on Breather before and had some seepage oil after ride before but it was not coming out of the actual breather it was coming from the rubber hose under the breather. Can you tell its coming from the fiber area?.

I don't even have a clamp on mine. I can just grab it and pull it off.

[fstsix]

For all those who have blown Valk. How many Did( not )have the 40 HD CV carb on thier bike when it  FAILED?.

[Joe Vandal]

Mine has the HD carb. Could that be the problem?

[fstsix]

Well as far as the oil coming out of your breather as Jeff said not good. But to watch a brothers bike melt down burns my A$$!!. I have had Turbo Sand rails and Ran Nitrous in the last ten years. And i will say this ( LEAN ) is a dirty four letter word to any boosted engine. That CV 40 is P.O.S and to add insult that regulator with the Dial is even (worse) I gave my HD carb away after i gave up on the idle circuit tuning or lack of to a friend in VA. And he took it to a racing shop and put his HD on the Dyno. And found that someone had modified the air bleeds and the Vacuum slide was not going all the way up. The problem with that is the Needle jet is on that slide is not letting full fuel to full throttle with the butterfly wide open the air to fuel ratio on dyno was serious lean on the graph @ WOT. 

[Jeff K]

Well as far as the oil coming out of your breather as Jeff said not good. But to watch a brothers bike melt down burns my A$$!!. I have had Turbo Sand rails and Ran Nitrous in the last ten years. And i will say this ( LEAN ) is a dirty four letter word to any boosted engine. That CV 40 is P.O.S and to add insult that regulator with the Dial is even (worse) I gave my HD carb away after i gave up on the idle circuit tuning or lack of to a friend in VA. And he took it to a racing shop and put his HD on the Dyno. And found that someone had modified the air bleeds and the Vacuum slide was not going all the way up. The problem with that is the Needle jet is on that slide is not letting full fuel to full throttle with the butterfly wide open the air to fuel ratio on dyno was serious lean on the graph @ WOT.  

Here's the problem with that.

You can't put that carb back on a Harley... because the vacuum hole has been modified.
The hole was made smaller for a reason.
The V twin has less of a "vacuum signal" than a flat 6. So with the slide hole opened up to OEM the slide opens WAY to fast on a Flat 6. So Bill modified the slide hole to control the speed of the slide.
So if you put it back on a HD it will not have enough vacuum to pull the slide all the way up.

How do I know this?
When I got my blower kit first installed I took it to the local Dyno shop to have it "fine tuned". They showed me the hole and then drilled it out. It made pretty good numbers on the dyno. But... I barely made it home. It was running so rich it had fouled the plugs bad. It was belching black smoke. So I called Bill and asked about the carb. He told me about the mods he made, and why.

Don't get me wrong, that carb is a POS but there is a reason for the slide mod.

[Joe Vandal]

Is there an alternative carb to use?

[Jeff K]

Is there an alternative carb to use?

The new kits have a Mikuni 45 on them

[fstsix]

Agree with the air bleed already sorted this out when wee where along side the Dyno.But yes you can put this carb back on the Harley when you have a Pro that has already pointed these mods out in front of you. Here is my thoughts Unlike the Harley the Honda Blower carb sits pointing forward towards frame when tuning could not see W/O mirror down the carb With the Harley as we know sits on side on Dyno you can stare rite down. This is how we were able to solve.Whats my point i never had the chance to look down the carb when was on my bike so cant really assume. I will say that i did talk to Bill at length and is Super Guy and already new about mods ect by no means do i want to through him under Bus so i referred to as Someone. Btw this Motor is thirsty 45 flat slide (mods) Larger excel pump     larger slow jet (95 riches jet needle ) And had to go from 175 main to drilling @ 240 Results Amazing but 31 mpg bike came ALIVE.      PS my back tire hates me LOL

[Joe Vandal]

Would you recommend replacing the HD with the Mikuni?

[fstsix]

I live in Rhode Island now if you are close by i let you ride you would be shocked. Yes if you are going to add 45 buy it from Magnacharger ( Bill ) I did this years ago and purchased from SUDCO. I still have the bypass tube no problems.

[Jeff K]

Agree with the air bleed already sorted this out when wee where along side the Dyno.But yes you can put this carb back on the Harley when you have a Pro that has already pointed these mods out in front of you. Here is my thoughts Unlike the Harley the Honda Blower carb sits pointing forward towards frame when tuning could not see W/O mirror down the carb With the Harley as we know sits on side on Dyno you can stare rite down. This is how we were able to solve.Whats my point i never had the chance to look down the carb when was on my bike so cant really assume. I will say that i did talk to Bill at length and is Super Guy and already new about mods ect by no means do i want to through him under Bus so i referred to as Someone. Btw this Motor is thirsty 45 flat slide (mods) Larger excel pump     larger slow jet (95 riches jet needle ) And had to go from 175 main to drilling @ 240 Results Amazing but 31 mpg bike came ALIVE.       PS my back tire hates me LOL

Oddly enough I spent many hours on this too and have put quite a few miles on the bike with the fuel tank off.
I put a fuel bottle in the saddle bag and did some testing without the tank on because I wanted to see if the slide was opening all the way. It was. I put a mirror where the air cleaner was.
But worse than looking in a mirror between your legs while you drive... I've been known to strap my laptop to my bars and tune my EFI.
My wife was pissed!

[Joe Vandal]

Unfortunately fstsix, I am clear across the country in Idaho. Lots of amazing riding here, why don't you come out here for a ride.

[fstsix]

Joe i had just did my tour around country Sep-Dec 2007 had my Valk with me in Raptor Tail Gate. Came down rt 90 to Bellingham WA. and did loop back south to rt 10 to Florida. Idaho is pretty mountains Next trip i will look you up. Jeff K Well you out did me for real with the Lap top on the bike    By the way i have a Coffee Can full of DEAD spark plugs. PS i put a Video Link to a friends blower killing his Big Block On the BLOWER parts thread by PVAN.

[Jeff K]

Joe i had just did my tour around country Sep-Dec 2007 had my Valk with me in Raptor Tail Gate. Came down rt 90 to Bellingham WA. and did loop back south to rt 10 to Florida. Idaho is pretty mountains Next trip i will look you up. Jeff K Well you out did me for real with the Lap top on the bike    By the way i have a Coffee Can full of DEAD spark plugs. PS i put a Video Link to a friends blower killing his Big Block On the BLOWER parts thread by PVAN.

Dead Plugs?
Yeah I have a pile too.
I used to go through them pretty quick until I got my fuel and timing all set.

I wonder where the bracket went? I'll bet my wife threw it out!

I had always wished I had a motor head\ computer geek friend that could follow me down the road and make the observations and changes via wireless network!

I bought an old dyno, but I need a way to put a load on the bike, a cheap way.