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Straight pipe and air filter Jetting

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Straight pipe and air filter Jetting

PostAuthor: HaugeJr » Thu Feb 13, 2020 1:47 pm

Hi

Wondering if anyone in here have straight pipes and aftermarket air filter and what jetting you guys use?
Such a hassle to get the carburetor in and out everytime I need to change a jet. Maybe i can hit the sweetspot straight away.

Got a 1997, 1100.It is around 70 degrees all summer and i live by sea level. The exhaust is pretty short. Cut off right before the end of the back tire.

Anyone who can help ?

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Re: Straight pipe and air filter Jetting

PostAuthor: mark75 » Thu Feb 13, 2020 2:13 pm

HaugeJr wrote:Hi

Wondering if anyone in here have straight pipes and aftermarket air filter and what jetting you guys use?
Such a hassle to get the carburetor in and out everytime I need to change a jet. Maybe i can hit the sweetspot straight away.

Got a 1997, 1100.It is around 70 degrees all summer and i live by sea level. The exhaust is pretty short. Cut off right before the end of the back tire.

Anyone who can help ?



I haven't jetted for "straights" so no plug-n-play suggestions.
just a guess --- around 135/140 ish?? your stock is ~122 to 125?

Jardine Rumblers with paper-type A/F; I raised the needles with 2-each (#4 washers - IIRC)

What do your spark plugs look like currently?

I agree, carbs in/out is a hassle, but after the 15th time, it gets 'easier'. :naughty:
old 10mm spanner with head bent ~35-40 degrees as a "specialty tool" will help some.
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Re: Straight pipe and air filter Jetting

PostAuthor: Jake » Thu Feb 13, 2020 5:22 pm

I deleted your duplicate post in “ Choppers Customs Café”. You only need to post one topic per issue/problem. Multiple threads on the same topic will not get you faster or better answers, most likely just duplicate answers. If different solutions should be offered, it's better to have them on one thread.

If you don't get an answer in a reasonable time, reply to your own thread with "bump".
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Re: Straight pipe and air filter Jetting

PostAuthor: Flyingdog » Sat Feb 15, 2020 6:23 am

JMO: At this point I wouldn't even worry bout change'n jetting (mains that is). Your "not' changing altitudes, yer just changing A/F flow rate/speed. "Possibly" may have leaned out the A/F mix, atad. I said: "Possibly", cuz this isn't always the case. Many factors are involved...state of tune in the first place, how you ride, are they truly "straight pipes" or have mufflers after the straight pipe off the heads, baffled or not, diameter of pipes, type of ambient air for your region (70° doesn't really mean much, your 70° is probly totally different than Texas or Colorado's 70°).... etc etc etc. My thought would be to stick with Marks suggestion and concentrate on the needles, at this point. Least with your Mikunis, it's just a matter of moving the C-clip down down the notches, to where ever is needed. This is where you'll be doing 90% of your riding, anyway. Less, yer a total hotdog and live WOT all the time. But, even doing just the needles..going to take some (maybe alot) of experimenting to find that sweet spot. Changing those 4 manifold bolts to allen/socket head bolts will simplify carb work (removal) greatly. Sometimes, you don't have to remove the carbs to get to the slides. Just alittle twishing action and the right tool will get ya past the bike's backbone. Wanna go a step further? Grind out the cooling fins under the inner most float bowl bolts. Then all you have to do is replace "those" 8 bolts with allen/socket head bolts. No need to remove the carbs, then. A 45° or 90° off-set bit driver is all that's needed to remove the bowls and get to the jets/floats. But..this is all really speculative, anyway. Almost impossible to tell someone how to set their carbs just in a different state...let alone on the opposite side the world.
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