Motorcycle Club » Star 1100 Classic & Custom

Drilling or cutting holes the dog dish?

12 posts from 5 voices
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  1. CruizerBruizer

    I recently replaced my stock air filter with a K&N high flow air filter. Mentioned to the bike shop owner that I hated it being almost totally covered by the dog dish. Short of shelling out the bucks for a new air filter housing (I'm still laid off and work ain't coming like I'd hoped though I just finished a short contract) he said he's seen some people drill holes in the sides of the dog dish to get more air flow.

    Anyone tried anything like this?

    I'm thinking about either doing that or cutting some gaps out so more air will get to it.

    What do any of you think of this idea? Will it work of will I do more harm than good? I think there are a lot of knowledgeable and innovative thinkers here and am curious what you think.

    Ride safe, watch out of cagers on cell phones, and thank The Man Upstairs for every safe ride.
    '99 V Star 1100 Custom
    Shogun Ripsaws
    Memphis Shades Malibu
    Lindby Multi-Bar
    Kuryakan Transformer Sissy Bar
    K&N High-Flow Air Filter

  2. fiwezdrinkmatnezz

    Drill in the area where the screen is on this bike. Sadly, there is no way to expose the filter to open air with the stock intake set-up. I did mine like this (with K&N also) and the bike woke right up. Good luck!

  3. quicgmicg

    It's been my experience that the biggest bottleneck with the stock intake isn't the stock dog bowl, it's the small "snorkel" that goes from the filter to the air box. Drilling extra holes will add a marginal amount of extra airflow, but not much according to the dyno runs I've seen.

    If you really want to wake your bike up and get a 6-8 HP gain, go with a POD filter set up. Just click on the "Pod Kit" link.

    That's by far the least expensive HP gain you can get on an 1100. If you're short on funds, a pair of foam air filters would run about $30, $15 for jets and $10 for new bowl screws. If you have the funds a pair of K&N RC-1150's are about $60 and are a far better set up than the foam filters. There have been hundreds of these conversions so there is a ton of jetting and performance data available through lots of dyno runs.

  4. CruizerBruizer

    fiwezdrinkmatnezz, did you add the screen behind the assembly or is it there? I'll probably go look before you reply, but if you added it, how do you keep it in place?

    Mick, thanks for the link. That Knowledge Base is a great resource. My thought was really just to help it breathe better and maybe get a little hp boost. It certainly sounds better since I added the K&N.

    Originally, my thought was to drill the chrome dog dish itself. Would that do any good? I haven't inspected it close, but I thought that's where the filter would be exposed the most. I've seen some filter covers where the filter is exposed and was thinking that was an inexpensive way to accomplish that. I'm sure I'm not the first to think of this, but since I haven't seen anyone actually do it, maybe there's a reason.

    Thanks for the help.

    Ride safe.

  5. quicgmicg

    Just a word of caution....

    If you can increase the airflow enough to get a noticeable HP'll need to check to see how lean you've made the fuel mixture. Too much leaner than stock = not good. Re-jetting would be a must in that situation. I had to re-jet when I added a Hypercharger. It sounds like you're trying to accomplish something similar.

  6. alexM712

    Look closely at the air flow path in the stock filter housing. Air is drawn in from the back of the housing up thru the inside of the filter. The inside of the filter is where the dirt is trapped. If you drill the chrome dog bowl, the air coming in will bypass the filter and go directly to the carbs unfiltered.

  7. CruizerBruizer

    Thanks for the additional input.

    I rejetted in Sept. '08 when I had lots of popping and backfire. Figured out the previous owner who installed the Shogum Ripsaws didn't rejet. Rejetting fixed that.

    Alex, great thought on cutting the dog dish. Won't do that! I see why fiwezdrinkmatnezz made his holes where he did. Makes a lot of sense now.

    Where in Central Texas are you? I graduated from Killeen HS in '72. Live in Fort Worth right now.

  8. fiwezdrinkmatnezz

    I didn't add the screen (found this pic on Google) because I used a small drill bit and swiss cheesed mine. You could probably use some kind of quick setting epoxy to hold screen in place. It works more like a ram air than anything. All my gain comes at higher rpms. Mick is right about the pod filters being the most bang for you buck, I just haven't done it yet 'cause I'm on a really tight budget right now.

  9. CruizerBruizer

    I'm right there with you, fiwezdrinkmatnezz. I was laid off last March and no luck yet. Had a 3-month contract that was prematurely ended last Friday...they told me on Thursday that Friday would be my last day. At least I was able to get some stuff done before the money ended.

    Mostly I'm just trying to help Bruiser breathe a little better and if I get a little extra boost, that's good, too.

    So let me ask this, is there any difference in drilling a few holes just to get a little more air in there, or is that purely for more hp? I swear he sounds better than with the stock filter.

  10. fiwezdrinkmatnezz

    It just makes the bike have to work a little less hard. The stock setup pulls all the air in from behind the box in the "v" of the jugs. With the mod, the air pushes into the box as the bike moves forward and sort of pressurizes. Instead of having to pull its air perpendicularly from the stream rushing past it, the air makes itself available in abundance. I didn't notice any sound difference. The real benefit comes at 70mph when some cager tries to merge into and you twist that throttle and blow by him like if he hit the brakes.

    Mick is right about the weak spot being the snorkle. I wish I knew what the designers had in mind when they put that whole bass-ackwards setup together. I'm going to a pod setup ASAP. Drilling the box gave me a couple more mpgs but if you're after performance you gotta get past that bottle-neck Yamaha put in there.

  11. bkman

    I'm with Mick on this one - the OEM airflow is very convoluted. PODs will make a big difference. If you can, take the K&N back and exchange if for the POD-style K&Ns (the part number is over at Slone's I think) and some jets. You will definitely feel and HEAR a difference. The reason I capitalize "HEAR" is because some people don't like the sound the carbs make once they're un-corked. It doesn't bother me in the slightest, but just be warned. The air rushing into the carb bodies makes a very distinct sucking sound. What doesn't suck is the way the bike runs, though.

    Good luck.

  12. alexM712

    I agree with the others. You can get two pod filters for the same price as the K&N OEM type filter. $25 or so for jets and a crankcase filter and your set.
    Recently put Pods on mine. Spent about $100 for parts and shipping charges. Follow the directions for jetting the carbs found in the KB and its super easy. No reason anyone can't do this mod.


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