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Old 08-02-2005, 01:25 PM   #1
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2T Tuning Thread

I'm starting this thread to get some of the more relevant technical info out of JM and into a wrenchin' forum. Anyone with 2-smoke experience is welcome to chime in.

I'm in the process of acquiring a 2003 Stella with 115 miles on it, and 5 miles on a new kit.

The kit is a Pinasco 177, 24/24G carb, and SIP expansion chamber. Not sure which main jet he's settled on at the moment--110 maybe, though this kit usually calls for a 118-124.

When I get it home, I have the option of putting the stock parts back on, or breaking in the new kit. This will be the first air-cooled 2T motor I've worked on-- my RZ350 was pretty bulletproof.

Anyway, I'll probably be bouncing back and forth between the Stellaspeed forum and this one. There are a few experienced tuners there, but since there's such a huge pool of know-how here and there's a few 2T scoot owners in our midst, I thought I'd get this posted to get the ball rolling.

Any wisdom on how to do this sort of thing? I know I'll be doing some plug reading, but is there any routine to this that takes some of the guesswork out?
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Photog screwed with this post 08-02-2005 at 01:59 PM
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Old 08-02-2005, 01:58 PM   #2
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Hey Photog, it's me again!

If I were you, I'd get myself all the gaskets to put that thing back to stock for a little while. You're not running a hack on it, so you don't necessarily need the power right away. It's a new bike you're just going to be getting comfortable with, so why not get everything back to the way it started just to feel it out for a little while and gain some understanding of how the thing works?

Just my .02.
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Old 08-02-2005, 02:02 PM   #3
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Thanks. I think that's probably wisest--everything I've read so far says that the Stella changes quite a bit during break-in, and since I don't have a buttometer benchmark to go by, that would be good to just get it rolling and then go from there--stock it's got enough chutzpah to get me to the post office just fine.

At that point I'll rename the thread "am I doing this right" and ask questions about gaskets.

You are the voice of reason
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Old 08-02-2005, 02:19 PM   #4
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Quote:
Originally Posted by Photog
Thanks. I think that's probably wisest--everything I've read so far says that the Stella changes quite a bit during break-in, and since I don't have a buttometer benchmark to go by, that would be good to just get it rolling and then go from there--stock it's got enough chutzpah to get me to the post office just fine.

At that point I'll rename the thread "am I doing this right" and ask questions about gaskets.

You are the voice of reason
My level of experience with these things is limited to the VBB and a rebuild on a Rally 200, so take my advice with a grain of salt. There are others that know those oil injected engines way better than I do.
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Old 08-04-2005, 10:42 AM   #5
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Old 08-04-2005, 11:03 AM   #6
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Quote:
Originally Posted by Photog
I'm starting this thread to get some of the more relevant technical info out of JM and into a wrenchin' forum. Anyone with 2-smoke experience is welcome to chime in.

I'm in the process of acquiring a 2003 Stella with 115 miles on it, and 5 miles on a new kit.
I'll be the voice of un-reason... jet it a little rich to keep the heat out of it, and run the hi-power kit. Who wants less power?

In my experience, 2 strokes are basically indestructible as long as they have plenty of fuel and oil. They make more power as they get leaner, but you should work your way up to that as you gain expertise... but as long as you've got plenty of oil getting into the thing, what harm can you do?

I'm curious for how y'all jet those things... typically, desert 2 strokes get jetted 2-3 mains larger than the same bike in the same conditions run on a motocross track, since the MX bike doesn't spend as much time tapped out. Seems like getting on the freeway and leaving the thing WFO for 10 minutes is a pretty good approximation of desert racing to me...
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Old 08-11-2005, 05:35 PM   #7
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Interesting thought about the desert racing.

I'm not sure how I'll be running this one since it's a 4-speed, and not knowing how much gumption it has to begin with, I don't know if it'll need to be flogged. The last stock one I rode was remarkably luggable. It was perfectly content to just plod around town in 3rd gear.

I spent about 2 minutes on the Stella this afternoon due to other constraints and will start the process of dialing it in next week. What I found tonight was pretty much what the owner said--it'll start and idle, but fouls immediately if you give it any gas and bogs. He said that 3rd and 4th gear were scary-fast....not sure how he got to that point to find out.

The Pinasco is known as a "touring kit", not an all-out speed kit, but even so, folks say it's pretty speedy.

He also mentioned that the bike wasn't set up at the stock 20 degree timing.

So...my first step will be to reset the timing (I hope this is something I can do), then maybe take the main jet down a bit after I've done a bit of reading on the carb--it's supposed the carb setup for the T5 engine.

He's using oil injection but also adding 1% to the gas.

One thing's for sure...that SIP pipe makes it sound like a big-bore Maico.

Back when I was roadracing my Saab (V4 with Weber downdraught) I used to keep a little Bayer asprin tin full of jets and just rejetted whenever I felt the need. Will this 2-stroke require the same sort of mood-jetting?
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Old 08-11-2005, 05:58 PM   #8
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I'll go out on a limb and say "that depends".

Here's my guess: If the carb is smallish relative to the motor, it will be much more tolerant of jetting, as it will have good intake velocity and allow the carb to work pretty well in most situations. If the carb is biggish relative to the motor, it will require jet changes much more often.

At least, that's my experience with off-road bikes. The new KTM's have a 36mm carb (they used to have 38's) and this thing runs great almost no matter what, where the old bikes used to require rejetting for every different condition.


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Quote:
Originally Posted by Photog
Back when I was roadracing my Saab (V4 with Weber downdraught) I used to keep a little Bayer asprin tin full of jets and just rejetted whenever I felt the need. Will this 2-stroke require the same sort of mood-jetting?
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Old 08-12-2005, 01:33 PM   #9
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Thanks for the help!

I'll dive into it when it cools down a bit and orient myself to what's under the cowl, maybe see which main jet he's got in there now. I've been spoiled by so many turnkey motorcycles in the past 20 years that it's a bit new to go back to actually being hands-on with regard to the most basic tuning issues.

I got all the sales receipts--lit's a 177 kit, not a 166 like I thought. I've also got a bag full of tools he threw in with the deal. They look like gynecology tools for a giraffe--must be a flywheel puller by the looks of it.
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Old 08-12-2005, 02:39 PM   #10
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Here's a thread from the original owner, documenting his work on the carb.

Here's the key info:

Quote:
Okay, thanks for the help so far, guys. I got some new plugs and had another go this AM. I have the bike running much much better. Still a little unwilling in 2nd and doesn't like 1st at all, but really flying in 3rd and 4th. The real problem, I think, is that the plug is totally black after five miles: sooty and a little wet. I had to switch out to a new plug to get it to start. So, clearly too rich.

The set up (again): Pinasco kit, 24/24G carb, SIP Performance pipe. The carb is currently stock with a 110 main jet.

To get it to idle smoothly and come down from revs the throttle stop is only 1/2 a turn out and the idle mixture screw is 2 turns out.

I'm a little worried about this. It seems to me (and I really don't know shit) that 1. 1/2 a turn out on the throttle stop is way too little, 2. a fouled plug after five miles with a 110 main jet is also a problem (especially as everyone else seems to be running between 118-124 with the Pinascos). Also, this is just running around the neighborhood with nothing above about 45mph, so am I even using the main jet enough for that to be the problem?

I'm wondering if I should take Sliphorn's suggestion and replace the 24/24G jets with those for the 24/24E set up. It seems that there's just something I'm not doing correctly (maybe to do with the relationshiop between the idle mixture screw and slow running).
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