Porting pics

[flyin#5]

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http://img.photobucket.com/albums/v643/Flyin5/S4200700.jpg

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http://img.photobucket.com/albums/v643/Flyin5/S4200685.jpg

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http://img.photobucket.com/albums/v643/Flyin5/S4200694.jpg

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http://img.photobucket.com/albums/v643/Flyin5/S4200684.jpg

Before:
http://img.photobucket.com/albums/v643/Flyin5/S4200695.jpg

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http://img.photobucket.com/albums/v643/Flyin5/S4200687.jpg

Before:
http://img.photobucket.com/albums/v643/Flyin5/S4200697.jpg

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http://img.photobucket.com/albums/v643/Flyin5/S4200689.jpg

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http://img.photobucket.com/albums/v643/Flyin5/S4200698.jpg

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http://img.photobucket.com/albums/v643/Flyin5/S4200688.jpg

[Twinky]

hey how did that turn out!!! my friend just ported mine out like that and i am kinda feeling like he overbored it... not running like i think it should. i havent put in differnt jets in yet.. hope thats a promblem.. but let me know how that worked out :) thanks

[TRX23rider]

does porting hurt your reliability any and about how much would it cost to get it done if i cant do it myself?

[400exmkt]

I got mine done for like 200, but i also had a bunch of other stuff done at the same time. I thought that was a fair price.

[pman03]

That's actually my head, and it turned out great. I also put in a wiesco 11:1 piston at the same time. With the porting, piston, and stock exhaust I can keep up to my friend until the speeds get up there, he starts to take me on the top. We went to a radar run this winter and he beat me by 1 mph in 1000 ft. He has a je 10.8:1 piston, hot cam stg. 2, and a full sparks x6 exhaust system on his.

[PismoLocal]

I was always told that when doing head work your not supposed to take very much materiel off the exhaust ports hence port(intake) and polish (exhaust), your supposed to make the exhaust side look like a mirror. Im might be wrong but thats what i have read.

[Twinky]

saawweettt.. thats good news gang!!! i got the porting done on head and stock exhast, 426 kit, and a stage 2 hot cam.. god i just wanna get back home n ride it now...what size jets are you running at pman03?

[pman03]

I'm running a 155 main dynojet, 3rd slot on the dynojet needle and i think it is 2 1/2 turns out on the air screw, with the air box lid removed.

I also have a big gun slip on for it, but i took it off because it was too loud. I was thinking about buying the vortex quiet core for it this summer. Does anyone have an idea how much quieter it makes it?

[wolffie]

looking nice man! have you been able to dyno your quad since the porting?

[igmif]

Originally posted by PismoLocal
I was always told that when doing head work your not supposed to take very much materiel off the exhaust ports hence port(intake) and polish (exhaust), your supposed to make the exhaust side look like a mirror. Im might be wrong but thats what i have read.

I think you have that backwards

[underpowered]

Originally posted by igmif
I think you have that backwards

nope, that is it. you Polish the exhaust to keep carbon buildup off mainly, but also let it flow more freeely. you do however want to make it larger just like you want a larger head pipe. you dont want to polish the intake, you want it rough. being rough provides turbulence allowing the air and fuel to mix better.

[pman03]

Originally posted by wolffie
looking nice man! have you been able to dyno your quad since the porting?

No, I haven't. I don't know where I would bring it around my area to dyno it.

after...

[SHADETREE101]

i have yet to see porting that was worth paying for on the honda 400 head. all you have to do is what was shown. open the exhaust side for flow. do not open the intake side much. it will kill your velocity. yes you need to smooth out the runners on the intake side. the fuel atomizes at the carb not in the head. the head is just a funnel for the mixture to go through. the less turbulance made the faster it can flow. the exhaust side should get the most polishing attention for carbon build up. exhaust flow should be optimized but not biggger than your header. match port them. you can get tricky and back cut the divider of the intake runner for volume gain, but i'd be careful with that. the valves may start fighting for velocity if done to far. just a thought.

ha, I have been looking for u. ur the guy with the 400 that runs on methinol.

wanna poast that pic of u smoaking the 450's in the drag, I saw it once but cant find it.

[SHADETREE101]

http://i18.photobucket.com/albums/b118/shadetree101/iwin.jpg hope you like. they are always scratching their head wondering what the hell just happened. hah

[SHADETREE101]

http://i18.photobucket.com/albums/b118/shadetree101/100-0018_IMG.jpg

can u run the 13.5:1 on gas. like c12 or c14. I am rebuilding my 400 from the ground up, and it would be nice to beat a 450 by that much.

I run methinol in my go kart, it is to much of a hasle to event think of running it in my quad.

[SHADETREE101]

the 13:5:1 piston is still in it, head shaved makes it 14:1 now on gas for the wife to ride. when i had it on alcohol i used a 44mm lectron carb set up by packard with a powerjet. it was tuned out of the box. just had to throw in alcohol and open the power jet up till it started to pull the handle bars off. four strokes are easier to run alcohol on than a two stroke. they are more forgiving as long as you are running fat. lean will kill all engines the same. as for the gas question i run straight 110 leaded out of the pump. no vp, or klotz fuels. i can buy it here for about 3.99 per gallon

[jordan_m6]

how do you hold up to banshees at st. joes

[z-mann]

Originally posted by SHADETREE101
the 13:5:1 piston is still in it, head shaved makes it 14:1 now on gas for the wife to ride. when i had it on alcohol i used a 44mm lectron carb set up by packard with a powerjet. it was tuned out of the box. just had to throw in alcohol and open the power jet up till it started to pull the handle bars off. four strokes are easier to run alcohol on than a two stroke. they are more forgiving as long as you are running fat. lean will kill all engines the same. as for the gas question i run straight 110 leaded out of the pump. no vp, or klotz fuels. i can buy it here for about 3.99 per gallon

Is this Ross?

[mike nash]

Check out chad502ex.com for DRG 400ex porting. It's worth checking out.

how long does it take for it to over heat. I dont think I could ever run on 14:1 for a mx race. I was thining of going with a 12.5:1 with cosmetic thin gaskets.

sry for hijacking the thread.. wups my bad.

when u run on methinol, dont u have to change the oil wicked often, and run special oil that is more agreeible with methinol? In my racing go kart, I had to change the oil after about 30 laps... 1 lap = about 1/5 mile ... thats an oil change about every 6 miles.
then I had to drain the carb, run it on gas for a min to get all the methinol out, then spray wd40 in the carb.

[SHADETREE101]

the banshees kill me still, so i bought one. as for changing the oil, i never had the oil look like milk. no special oil used either. the rings on a 4 stroke are better sealing than a two stroke. their is nothing special needed to run methinol other than a carb set up for it. if your oil ends up looking milky then you weree running way fat. and yes this is ross.

[SHADETREE101]

i have a temp guage on the oil tank. as long as you jet it right it won't overheat, on gas or especially methinol. on methinol i couldn't get it to run hotter than 200. on gas it runs around 260. normal operating temp is from 250-300. since oil breaks down at 250 and above i run synthetic for extra protection on gas.

[z-mann]

I figured it was you. We went to high school togethor...

my go kart is a 4 stroke...


But anyways, thanks for the info. U selling that carb by chance? I see u are swaping back to gas, so mabie u will sell the carb.

[SHADETREE101]

who would you be z-mann

[SHADETREE101]

you can get them from packard enterprises. great guy to talk to and will have it tuned pretty close after talking to him and giving him your set up. i think i got mine for 300 or so.

[stc416rider]

so to sum up all the porting and polishing you need to grind down the exhaust side more than the intake side

wat if you just did the exhaust side would u be robbing yourself of power or wat i want to do a mild port job on mine with the mods in my sig and a modified stock exhaust

[SHADETREE101]

if you port the exhaust side, you would be crazy not to at least clean up the castings in the intake runner as well. but yeah there isn't much to it.

[EXevan91]

and guys meth and alchol runs cooler than gas