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 Post subject: Short Runner VS Long runner- Intake
PostPosted: Mon Jul 02, 2012 10:13 am 
I have been tuning for a while. Im curious to see peoples opinion/Experience with Long vs Short runners on the carb.

Short: 1-3"
Long: 4+"


Im currently running a 3" runner with no filter and it performs GREAT. Nice throttle response, quick rev up, and nice top end.
35SJ/75MJ

I tried a 5" runner and It BOGGed like a Mother! Of course meaning it was running super Lean. Wonder if anyone has tried different length runners.

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 Post subject: Re: Short Runner VS Long runner- Intake
PostPosted: Mon Jul 02, 2012 1:13 pm 
i got the 6 inch home depot j pipe with uni filter and i LOVE it! sounds awsome. performs great throghout the rev range. :banger:

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 Post subject: Re: Short Runner VS Long runner- Intake
PostPosted: Mon Jul 02, 2012 1:23 pm 
ruckus09 wrote:
i got the 6 inch home depot j pipe with uni filter and i LOVE it! sounds awsome. performs great throghout the rev range. :banger:

Jetting ?

Also have you tried a shorter to compare?

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 Post subject: Re: Short Runner VS Long runner- Intake
PostPosted: Mon Jul 02, 2012 1:29 pm 
38/90 jetting.

and yes i tried a shortened j pipe about 4 inch felt like i lost my top end. didnt pull as hard. also tried with filter just mounted on front of carb and that was just TERRIBLE!

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 Post subject: Re: Short Runner VS Long runner- Intake
PostPosted: Mon Jul 02, 2012 1:40 pm 
ruckus09 wrote:
38/90 jetting.

and yes i tried a shortened j pipe about 4 inch felt like i lost my top end. didnt pull as hard. also tried with filter just mounted on front of carb and that was just TERRIBLE!

Whoa, 90? Thats HUGE.

Good info.

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 Post subject: Re: Short Runner VS Long runner- Intake
PostPosted: Mon Jul 02, 2012 1:42 pm 
lol u know ive forgotten it may be 80? ill have to look later when i get home lol. maybe im thinking of something else...................

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scooTVdude
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 Post subject: Re: Short Runner VS Long runner- Intake
PostPosted: Mon Jul 02, 2012 1:48 pm 
I'm rockin just the bent elbow part with a Uni Filter. Bit loud at WOT but responsive.
I got it on a PC20.

-Honest™

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 Post subject: Re: Short Runner VS Long runner- Intake
PostPosted: Mon Jul 02, 2012 4:59 pm 
Honest Mike wrote:
I'm rockin just the bent elbow part with a Uni Filter. Bit loud at WOT but responsive.
I got it on a PC20.

-Honest™

I guess I should of included "Stock carb" since Slider carbs you control the needle, not vacuum.

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 Post subject: Re: Short Runner VS Long runner- Intake
PostPosted: Mon Jul 02, 2012 5:04 pm 
Our intakes using the rad hose is 6"+. Our testing found it to be far better than any short set-up.

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 Post subject: Re: Short Runner VS Long runner- Intake
PostPosted: Mon Jul 02, 2012 5:25 pm 
mnnthbx wrote:
Our intakes using the rad hose is 6"+. Our testing found it to be far better than any short set-up.

What kind of Main jetting did you need to run 6"+ of hose

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 Post subject: Re: Short Runner VS Long runner- Intake
PostPosted: Mon Jul 02, 2012 5:29 pm 
It obviously depends on what else you're running, but most of us are on 38 / 85ish. I've run as high as 90, but liked it a bit leaner.

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 Post subject: Re: Short Runner VS Long runner- Intake
PostPosted: Mon Jul 02, 2012 6:19 pm 
damn you con. i love this fucking topic! it makes such a huge difference and i don't think guys even know. the width of the intake tube makes a huge difference too. i can run the same pipe, different intake, and make or break my setup. your tranny, load on the bike, and pipe play huge rolls on this. the jetting difference between the two setups can be surprisingly large too.

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 Post subject: Re: Short Runner VS Long runner- Intake
PostPosted: Tue Jul 03, 2012 9:10 am 
mnnthbx wrote:
It obviously depends on what else you're running, but most of us are on 38 / 85ish. I've run as high as 90, but liked it a bit leaner.

I have always believed that anything bigger than 85 is way to much. I am going to try and tune my bike with a 4"+ runner and see how much more fuel it needs to run right.


Jedi wrote:
damn you con. i love this fucking topic! it makes such a huge difference and i don't think guys even know. the width of the intake tube makes a huge difference too. i can run the same pipe, different intake, and make or break my setup. your tranny, load on the bike, and pipe play huge rolls on this. the jetting difference between the two setups can be surprisingly large too.

Althought I have not tested different Diameters, I stick with a standard 1-1/4" sink pipe. I have been trying to get my hands on a Cone style intake pipe. Maybe a 4" to 1-1/4" taper.

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 Post subject: Re: Short Runner VS Long runner- Intake
PostPosted: Tue Jul 03, 2012 9:25 am 
Time and time again, people have been shocked how much richer they had to go after running our intake. viewtopic.php?f=124&t=47139&start=0 I have little doubt that larger runner flows far better than most, including the hardware store 90 degree deal... Doesn't take a flow bench to figure out. The rad hose has a long length, large ID, smooth bends, and a good straight section prior to the carb. It's dialed. Pretty sure Jedi runs one, and Lord knows, if anyone likes to mess with jetting, it's him...

***NOTE*** That's not a sales pitch. After those are burned and welded, I don't make enough to justify my time honestly, so I' not making claims to sell intakes, just stating the fact for the purpose of this topic.

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Last edited by mnnthbx on Tue Jul 03, 2012 10:15 am, edited 1 time in total.

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 Post subject: Re: Short Runner VS Long runner- Intake
PostPosted: Tue Jul 03, 2012 10:11 am 
Great info mnnthbx.

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