Vent that Stock Cap!
(but only if you have too – like all you nuts that just
HAVE to put on a 42HSR Mikuni)
Here we’ve got the basic items we need to dis-assemble
the stock cap:
Next we remove these two screws and the lock tab cover:
Now this is the part you want to pay attention to, be
careful of the springs that are supposed to be located in the machined hole in
the arm. In this case, the cap is that a friend of mine attempted to vent and
totally screwed up. I had a good laugh on him.
As you can see here, he’d tried to masking tape the
springs in place and on one of the arms had taped the spring to where is
couldn’t even work – we’ll re-assemble a much easier way………….
Next off is the flat ring:
Then the spring plate:
Pay careful attention to the four gold colored springs
and don’t lose them. Just pick them out and put them in a safe place; Around
the pockets where the springs sit is where were looking for these little
We’re going to remove these with needle nose pliers or
whatever you can get ahold of them with, they will not be going back in.
UNDERNEATH these are some rubber plugs we need to dig out. I used a sharp punch
and they popped right out. Here’s a pic of them:
The place these came out of should now look like this
open to the atmosphere OMIGOD! SOMEONE CALL THE EPA!:
Now we begin re-assembly with the spings, spring plate,
and washer. Refer to the prior pictures if you need to:
Now we’re going to put those lock tabs and springs back
in and we’re going to do it the right way. What we’re gonna do is take some
good old Vaseline, smear the spring cavities full and **gently** lay the arms
on the cap making sure the recess in the end of the lock tab is seated in the
projections pictured on top of the cap. If you have a doubt as to where they
go, lay the end plate back on and look where the holes come out. Line up the
arms accordingly. Here is a pic of the lock tabs in place with the springs held
in place and resting where they should be. It will take a little pressing down
on the top plate that the screws go through and “jiggling” a bit and then they
will seat. At that point you can put the screws back in.
Above: The springs held in place with Vaseline
Above: The arms in proper position with springs in
place – they are just “laying” there ready for the end cap to go on like this:
Remember, it may take a little “finessing” when you put
the end cap back on but once the screws are tight again you’ve got a fully
vented stock Road Star cap just waiting for that Mikuni Flat Slide! Don’t worry
about the Vaseline, the gas will wash it out and if you’re really paranoid you
can always spray some carb clean and WD40 it. Please check operation with your
key to make sure the lock tabs FULLY retract or you will not be a very happy
camper when you test fit the cap…………don’t ask how I know!
Here’s your new vented stock cap, the Mikuni will get
all the gas it needs, and I’m SURE all of you that are making this mod specifically
for off-road use.
Safe and Happy riding for all!
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Discuss this article on the forums. (22 posts)
This information and procedure is provided
as a courtesy and is for informational purposes only.
Neither the publishers nor the authors
accept any responsibility for the accuracy, applicability, or
suitability of this procedure. You assume all risks associated
with the use of this information. NEITHER THE PUBLISHERs NOR THE AUTHORs
SHALL IN ANY EVENT BE LIABLE FOR ANY DIRECT, INDIRECT, PUNITIVE, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES, OF ANY NATURE ARISING OUT OF OR IN ANY WAY
CONNECTED WITH THE USE OR MISUSE OF THIS INFORMATION OR LACK OF INFORMATION.
Any type of modification or service work on your motorcycle should
be performed by a
If performed incorrectly,
this procedure may
endanger the safety of you and others
on your motorcycle and possibly
invalidate your manufacturer’s warranty.
Quote this article on your site | Views: 61943
|Written by YahMaHa, on 02-25-2013 14:33 |
This was a snap...thank you for the awesome instructions!!!
Written by chromepony, on 08-19-2011 15:57
...worked like a charm.
|vent if still using fuel pump|
Written by whitegold, on 04-24-2011 16:36
I have a 42 but haven't finished porting manifold yet. will install carb and manifold at the time of pingel. should I vent cap now to provent collasping tank syndrome? still learning.
|Plugged vent tube|
Written by VegasEdo, on 04-30-2010 19:02
When I rinsed the tank to install my Pingel petcock, I somehow plugged the tank vent tube, so this was a lifesaver. Easy mod, taking my time it took 15 minutes.
|Just one tip the article missed|
Written by Randysgym, on 11-08-2009 13:58
Mine is a 2003, and my 'Lock Tab Cover', as described on the first photo, has an extended alignment tab sticking out that must be oriented so that it faces forward when installed into the tank.
|Another way to vent?|
Written by Scotto, on 07-23-2009 10:04
Would removal of the roll-over valve have the same effect? Although, venting the gas cap is much easier.
|2000 Silverado 1600|
Written by Tigger, on 04-25-2009 22:50
My gas cap is very different from thone in this thread. Is it pssible to vent the one I have?
|Written by yamaha14, on 01-14-2009 18:23 |
I have A vent on my tank A hose runs off top of tank It got pluged and my tank had collapse I put new hose on it IT"s ok now do I steel need to vent gas cap The tank it self is vented could someone please let me know
|vent gas cap|
Written by llp505, on 11-02-2008 07:17
I noticed that this thread was postted in 05 does this meathed help with the 07 star
|That was simple..|
Written by Kai, on 07-10-2008 11:17
Now for you guys that park in garage and your wife doesn't like the smell of gas...just take a sandwich bag and put it over the hole of the tank and gently put your gas cap over the bag and push then lock into place...that way it makes the wife happy and you can still park in the garage...
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