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[porthole]

"Hoggy" mentioned this to me since I am still waiting or a part.

DRILLING ROCKER ARM STANDS (OPTIONAL ALL MODELS)
Included in your Mystfree kit is a number 43 drill bit, which measures .089 in diameter. There are two oil drain return holes located in the rocker arm stand cavity in which the

I have never had a "misting problem", although I can launch my dipstick if I try. Even then the only mist is from the oil tank.

Any pictures of what to drill? Still recommended even without a misting problem?

The above quote says drill the stand and drill the stand cavity, which is it?

I have always had the breathers as stock into the air cleaner. Also have used the new style breathers for awhile now.

[sadunbar]

"Hoggy" mentioned this to me since I am still waiting or a part.

I have never had a "misting problem", although I can launch my dipstick if I try. Even then the only mist is from the oil tank.

Any pictures of what to drill? Still recommended even without a misting problem?

The above quote says drill the stand and drill the stand cavity, which is it?

I have always had the breathers as stock into the air cleaner. Also have used the new style breathers for awhile now.

The holes they are suggesting drilling larger are located in the rocker arm support.  (see photo)

I've never had to do this, but I've never launched a dipstick either.  I did fix a friends bike that was launching the dipstick - his breather assembly was assembled ass backwards.  He had installed the latest version breather incorrectly (easy mistake to make) and it completely plugged the system.  Launching a dipstick is due to building crankcase pressure.  There are a number of potential causes, including your breather system not functioning properly.  I don't know of a downside to drilling out the drain holes, but then again, I'm sure there's a reason for the designed hole size...

[SteveFLHTK]

My bike is coming apart next week for a cam upgrade, so this is on the table to be done.  Basically, I am puking just a bit of oil into the filter area.  It gathers on the bottom of the cover, and eventually will drip out, if allowed to accumulate.  I do run 1/2 quart low, btw so that's not the problem.  Basically, the oil is vaporized and is supposed to go through the holes and into the intake before liquifying.  The holes are so small, it allows the oil to liquify, causing it to build up and end up dripping out the oil filter assembly.  You can drill up to 1/8" but I haven't heard of any bigger. 

[porthole]

Scott, the dip stick has only been an issue under hard, high rpm use. Basically 3/4 plus throttle and 3500 plus.

I have never launched the stick running under those parameters. 4500-5000 is not a problem either, as long as it is not high throttle.
I have ridden as far as 8-10 miles with no dipstick, just a paper towel stuffed in the hole with no problem as long as I kept it under 3000.

I changed out the breathers some time ago to the new style.
I removed the Baisley oil pump spring (SE cam plate and pump) several years ago.

And as I mentioned it above, I don't have a misting problem.

So I guess since have this apart does it hurt to drill?
Don't fix what ain't broke?

[porthole]

BTW, I'm hoping my dipstick issue is related to the rings I found in the other thread.

[Twolanerider]

I've done it twice Duane.  Both times on engines with significant misting problems.  One an 03 and the other an 05.  Didn't help either one.

[grc]

It's a very old "fix" that predates our 103's (the problem can be traced all the way back to 1999), and to the best of my knowledge it has never really been shown to cure a carryover problem.  The theory was that the oil wasn't draining from the heads quickly enough, so the oil level in the heads became too high and overwhelmed the breather/separator system.  Enlarging the drain back holes would theoretically keep the oil from backing up in the heads.  Unfortunately the carry over problem is much more complex than that, so while it may help in some cases it isn't a panacea.

I can't think of any reason why you shouldn't enlarge those holes, but I also doubt it will make a significant difference unless you actually have an abnormal restriction due to a casting flaw or machining error.  As for the problem blowing the dipstick out, I'd be more inclined to suspect a restricted vent line (oil pan to crankcase).

Jerry

[porthole]

Jerry,  my vent is the replacement chrome pipe. 3/8" I believe and has always been clear whenever I had it off.

[HILLSIDECYCLE.COM]

We open those to .125" on all in-house installs.
Scott

[sadunbar]

Scott, the dip stick has only been an issue under hard, high rpm use. Basically 3/4 plus throttle and 3500 plus.

I have never launched the stick running under those parameters. 4500-5000 is not a problem either, as long as it is not high throttle.
I have ridden as far as 8-10 miles with no dipstick, just a paper towel stuffed in the hole with no problem as long as I kept it under 3000.

I changed out the breathers some time ago to the new style.
I removed the Baisley oil pump spring (SE cam plate and pump) several years ago.

And as I mentioned it above, I don't have a misting problem.

So I guess since have this apart does it hurt to drill?
Don't fix what ain't broke?

I don't think it will hurt, but I've never seen an instance where it helped anything either...   

[porthole]

So, the vote looks like it doesn't solve the misting issue if you have it, but it can't hurt to help drain all the oil from up there.

And it' s a freebie, guess I'll give it a whirl since the support are sitting on the bench.

BTW, the gaskets are not available separately for the new style breathers, the foam filter is  

Also found out tonight the clutch and front brake master cylinder gaskets are no longer available separately, you have to buy a cover assembly for $30+

[prodrag1320]

we drill them on the the more aggressive builds,but having the umbrella valves in good condition will make a bigger difference

[sadunbar]

So, the vote looks like it doesn't solve the misting issue if you have it, but it can't hurt to help drain all the oil from up there.

And it' s a freebie, guess I'll give it a whirl since the support are sitting on the bench.

BTW, the gaskets are not available separately for the new style breathers, the foam filter is  

Also found out tonight the clutch and front brake master cylinder gaskets are no longer available separately, you have to buy a cover assembly for $30+

Correct and correct...  Life with the MOCO...   

[Twolanerider]

Also found out tonight the clutch and front brake master cylinder gaskets are no longer available separately, you have to buy a cover assembly for $30+

Check Custom Chrome part numbers 27066 or 27068 (w/o or with peep hole).

[porthole]

Check Custom Chrome part numbers 27066 or 27068 (w/o or with peep hole).

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