Crossing over...

[81xsproject]

So, yesterday I gave the Colortune a third chance after reading more rave reviews a while back. This time I turned the idle up before tuning. There was still a lot of mis firing, but not as bad. I was still amazed at how far out I had to set the mixture screws to get the slightly golden blue. I was starting at around 3.5 out and must have turned them to around 5 I am sure that the idle circuit is clean and clear. Maybe I will raise the fuel level and re-tune.

Anyway, I am now a believer in Colortune.

Oh yeah, I also used a different homemade synchronizer with much success that is even cheaper than the one in the tech tips. It is simply 2 very long pieces of vinyl tubing with a combo MMO+oil in the tubes. I hooked the ends of one tube to 1 and 2, and the ends of the other to 3 and 4. Once I got the fluid heights the same, I shut it down, and hooked the ends of one tube to 1 and 4 and repeated the process. It worked great and was considerably faster than using the single gauge.

[mro]

Maybe I will raise the fuel level and re-tune.

Have found that a single mm can make a big difference.
If your bike seems to be pretty close to tuned would try 1/2 mm at a time. Tried to "richen" my 80G by raising the fuel one mm from spec, idle was great, would cruse just fine, no ping but also lost some power when twisting the grip. Back to OEM spec until I get around to trying re-jetting.


mro
btw, no pic of your sync tool

[81xsproject]

okay, okay! I will get a pic up here later.

[TADracer]

If you are 5 turns out on your screws, maybe that means you could go up one higher on your pilot jets. Just a thought.

[jwoell]

I don't want to hijack your thread, but I was also colortuning the other night and I had a few troubles of my own. First off, I couldn't get the plug to read anything but blue unless:

1. I turned the screw all the way in until it bottomed out (no, not hard enough to break the tip). Where it would basically cut out that cylinder completely.

2. I turned the screw way way out where the bike started sputtering a little and I guess I couldn't really tell what color it was. I'm assuming lean.

So my understanding is that turning in the screw in richens it up and backing the screw out leans it out. Just wanted to double check and make sure that's right. Also, i've read that these bikes like to run a little rich, right where the blue transitions to yellow, so that's what I was shooting for. Unfortunately I couldn't get there without bottoming out the adjustment screw.

So I'm running pod filters and main jets that are 2 steps larger. Other than that it's all stock. So what are peoples thoughts on this? Adjust it with the floats or drop in larger pilot jets?

[TopCatGr58]

Hey Jesse=Jwoell,

You've got it backwards. Turning the screw in CW LEANS the setting, turning it CCW out richens it. I've not used a colortune, but if what you're saying that it was only BLUE and that indicates leanness, then you possibly may need to go up on the pilot jet one size....but as others have said about the floats, you can sometimes raise the fuel level/floats 1 mm(right side up)/lower floats=upside down to raise fuel in bowl which will also richen it up a bit!

Not sure why you were able to get a slightl gold color with the screw all the way in/bottomed out, perhaps it was causing it to suck fuel thru the mains a little when it could no longer suck thru the pilot circuit??
T.C.

[79XS11F]

I'm with TC .. If you can't get what your looking for with the pilot screws then you may want to change out the pilot jets in the correct size direction for what you need to fix.
For me the color tune worked very well and my bike is still running real nicely.
Rob

[skids]

I am thinking that maybe you are leaking air past your pilot screws and that maybe your bike is running with the idle screw turned too high to compensate for restrictive pilot jets???

Originally posted by jwoell
I don't want to hijack your thread, but I was also colortuning the other night and I had a few troubles of my own. First off, I couldn't get the plug to read anything but blue unless:

1. I turned the screw all the way in until it bottomed out

[81xsproject]

Just for clarification I knew out (CCW)=more fuel.

Unfortunately, some idiot PO stripped one of the pilots, so it, I think is in there forever.

[mro]

so it, I think is in there forever.

Takes a little time but can drill it out.
Easiest with a drill press.
First hole about 1/4 inch deep in head of screw.
Turn by hand one size larger reverse bit to back it out.

Have never tried to repair threads that small....
so not sure what your options would be.


mro

[79XS11F]

Yeah .. drill the small hole in it and use one of those striped screw extractors. Once ready to go spray anti seize and add heat. The carb body should warm up and expand faster then the brass jet and it should come out.
Rob

[jwoell]

Hey thanks for all the good info guys. What a dumba$$ I had thought that screwing the mixture screw in was limiting the air and richening it up. Yes, very brilliant of me ehh? Ok, i'll go and fix that tonight because I drove the bike to work today and it's backfiring on deceleration. I let my coworker drive it and he came back laughing saying "that son of a bitch sounds like a shotgun going off!!!" So yeah, brilliant I tell you, just brilliant.

So anyway, backfiring on deceleration like that is generally caused by a lean condition is it not? Just wanting to double check in case I'm getting this one bassackwards too.

[fredintoon]

That or holes in the exhaust.
Mine started popping on overrun a while back, along with a faint (my hearing is shot) tinny buzzing noise starting at ~3,000 rpm. OK, some economy-minded PO had welded the mufflers onto the pipes. Checking my oil level with my mirror on a stick I noticed the adjacent muffler weld looked kinda funny. Closer inspection showed total weld failure. A gap you can see through all the way round it. Once the snow flies I'll look for a used replacement exhaust system but for now, it's a temporary fix with a coupler piece from Canadian Tire. Test run coming up.

[GtrMn]

So anyway, backfiring on deceleration like that is generally caused by a lean condition is it not? Just wanting to double check in case I'm getting this one bassackwards too.

Yeap was on mine anyway....anywhere from 1/4 to 1/2 CCW turns made the difference on mine.

[GtrMn]

Ooops just read that you're already at 5 turns out? I'm between 2 and 3...could be going up a jet size then....or a problem with the pilot circuit.