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Old 08-15-2009, 09:23 AM   #76
JensEskildsen
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Joined: Mar 2009
Location: Denmark
Oddometer: 967
The mainjet has no effect on lover rpm and idle speed.

There are multiple circuits, each one working for itself, eventho they overlap.

F.x: The needle works around the midrange, and the mainjet at full throttle.

The bike can very well be lean at idle/low rpm (fuel screw + idle jet) and be rich on the top (main jet)

I made some mods to my xt600e:

Bigger downpipe, opened up laser produro exhaust, opened up the airbox, and inserted foamfilter.

I raised both needles and went from 130/120 jets, to 140/130.

I gut it on a dyno bench to test it:

The bottom was very lean, middle eah okay, the top was to rich.

So I've ordered 2 oversizes idlejet, and 1 oversize main jet, so im going for 135/120, as it didnt need much extra fuel in the top, apparently.
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Old 08-15-2009, 04:06 PM   #77
edeher OP
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That is a breather for the throttle body...do not cap it. I am looking for a small vent filter to go there. Maybe at pep boys or autozone. The black vacuum on a swivel between the two carbs can be capped. That would normally go to the tank i believe
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Old 08-15-2009, 04:34 PM   #78
spacewalker
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Quote:
Originally Posted by edeher
That is a breather for the throttle body...do not cap it. I am looking for a small vent filter to go there. Maybe at pep boys or autozone. The black vacuum on a swivel between the two carbs can be capped. That would normally go to the tank i believe
just what i needed to know. thanks
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Old 08-16-2009, 05:51 AM   #79
edeher OP
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Here is a perfect filter for those vents....if you buy three then you can put one on the crankcase vent and ditch the whole airbox making the carb and all the filters more visible, looks cool
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Old 08-16-2009, 05:53 AM   #80
edeher OP
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Is there some type of scanner or tool i can buy that will show me my air to fuel ratio to know how lean or rich i am running? I think it should be around 14 to 1 right?
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Old 08-16-2009, 08:57 AM   #81
JensEskildsen
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Joined: Mar 2009
Location: Denmark
Oddometer: 967
The sparkplug is a good indicatioer a long way on the road.

Test in different rpm ranges (circuits)

Take it for a spin so its nice and warmed up, then go a few miles in the lov rpm, pull the clutch and push the killswich. Take out the plug, white= lean brown = spot on, black = rich.

Fix that (adjusterscrew, idle jet) then move up to middle rpm do the same, and adjust the needle. Same on full throttle, here you're dealing with the main jet.

After that, spend the bucks on a dynorun, it'l show you mixture throghout the rpms, and a powercurce and how many horsies on the rear wheel.

JensEskildsen screwed with this post 11-01-2012 at 11:51 AM
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Old 08-16-2009, 09:11 AM   #82
edeher OP
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a dynorun hugh....i know one close by my work, ill give that a try, i didnt know that gave air to fuel mixture(wonder how they calculate that on the carb engine? through the exhaust maybe?. My spark plug is way too hard to get out to try that other test. I have an oversized tank and it has to come off to get the plug i think.
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Old 08-16-2009, 02:01 PM   #83
JensEskildsen
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Yub, they messure it from the burned exhaustgasses.

As to the spark pug, yes, seat and tank of, but thats a couple of bolts, and you can leave the bolts out when testing, no problem.

A few hours of riding and playing around, and you've got a good base setting.

I'm waiting for my jets, hope mine's gonna be just right with theese :)
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Old 08-16-2009, 03:19 PM   #84
edeher OP
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hope so, its not easy
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Old 08-20-2009, 05:49 PM   #85
edeher OP
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Just got the jets in and they sent the wrong damn jets!!!! DAMNNN
Oh well....there goes another two weeks
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Old 08-25-2009, 07:31 PM   #86
edeher OP
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Jets come in tomorrow...hopefully it will be close enough i can dial it in with just the fuel screw and needle. here are the filters on as of now

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Old 08-26-2009, 01:21 AM   #87
JensEskildsen
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Looks nice, please keep us updated :)
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Old 08-26-2009, 04:40 AM   #88
edeher OP
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If i would have gotten green filters instead of red it could have been a shrek filter... wommp wommmp wommmp
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Old 08-26-2009, 04:53 PM   #89
edeher OP
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I got the jets in and put the whole thing together and put the carbs in the bike and only now i noticed i have lost my choke set up, i found the spring and cap on the ground so i think the dog ate it for lunch....anywazy i will order one and update later.

So far i put the jets in but the main jets did not fit into the cap that was origonally there so i just put them in without that cap. Here are some pics so you know what im talking about, anyone know what this cap is for and if it will run without it????





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Old 08-26-2009, 04:54 PM   #90
edeher OP
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