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stoneagegixer

Drilling number plate...necessary?

9 posts in this topic

I see xr650r motards with drilled number plate to allow more air into the air box. Is this a real benefit? I don't ride in the dirt. I've checked a bunch of uncorking threads and couldn't find a proper answer or a mention about it....

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I call it the Super Charger mod. It almost seemed like as much difference as the initial uncorking it's self. I did mine myself. I went with the two large holes & riveted aluminum window screen on the inside. I also drilled a bunch of small holes in the pattern of a "650" above the screened holes. This mod required 1 bigger pilot jet & main jet. I used to run a 168 main & 68S pilot, now it's a 170 main & 70S pilot, and I'm at 5000 Ft. The best part, I didn't loose any fuel economy. The stock bike gets about 80 miles/tank off-road. Uncorked gets about 50. The cut-out air box still gets me 50 miles, with more power.

If you have a Dremel tool & a pop rivet tool, I think the screened holes look cool. If all you have is a drill, think of a cool pattern drill out. Keep the holes small so large debris can't get in. The plastic strings a lot when drilling it, so most of your time will be cleaning off all the strings.

If you don't ride off-road, this is almost a downfall free mod. If you are in the dirt, be prepared to clean your air filter 2-3 times as often. When you wash your bike, or trailer it a long distance, cover the holes with duct tape. It's kind of a pain, but it's better than soaking your filter. I guess you could get a second side plate & swap them out, but that's pricey.

There is a good rule about engines. The more air the better, IF you can provide the fuel to match it.

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It allows more airflow to the carb. You might have to richen up the carb a little to make up for the extra air. Good luck, OZ

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Anybody have any pictures of a bike with a drilled number plate?

Is this something that might benefit the XR600's as well??

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Thank you guys for the advice. Funny that this mod is not mentioned that often. Is there such as thing as too many holes in it? I guess I'll just look at pics of other mods and copy those....

Lubos

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I put 2 large holes in it like team honda , but find it has a momentary bog now, unlike before. this is with jetting as well (185mj, sea level) I cover it over a bit with duct tape and it hesitates less and has more pull. go figure, maybe I need a 190! I also run a uni filter w no backfire screen.

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I looked at the pics. For some odd reason I was thinking of the number plate as the headlight surround. I guess I can be a goof some times. I was wondering how in the heck drilling the headlight surround could get more air to the carb. Now I get it. It's the NUMBER PLATE! Okay.. I still have to ask if this mod would work on an XR600R???? Or is it just not worth the extra hassle?

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Thank you guys for the advice. Funny that this mod is not mentioned that often. Is there such as thing as too many holes in it? I guess I'll just look at pics of other mods and copy those....

Lubos

Like I said, as long as you take the time to match the jetting to the amount of air, there is no such thing as too much air. A supercharger or turbocharger on a car pump air into the engine, so it can get more than a standard intake will allow. The computer then adds more fuel to match the air, and you end up with a bigger, more powerful explosion. NOS has the same effect. Nitrosoxide injects huge amounts of oxygen into the intake. Those kit also come with a fuel injector to add the needed fuel to match the O2.

I put 2 large holes in it like team honda , but find it has a momentary bog now, unlike before. this is with jetting as well (185mj, sea level) I cover it over a bit with duct tape and it hesitates less and has more pull. go figure, maybe I need a 190! I also run a uni filter w no backfire screen.

I'm willing to bet you need a bigger pilot jet. Try a 70S pilot jet. I'm at 5000 ft. and I'm running a 70S pilot. I've given it a lot of air though. I've never rode at sea level, and I don't know how your engine is set up. If you have a stock engine, that seems way too rich on the main. I'd be willing to bet you need a 70S -72 pilot jet, (not sure if a 72S is availible), a 175-178 main jet, and the needle on the 4th notch from the top.

Here is my side panel:

650_Cutout.jpg

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