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Post by ThaiGyro on Nov 25, 2020 17:49:32 GMT -5
Hey 13brx3...just read the thread and responses. All good stuff, as these guys know their shite. Not sure how new you are to this forum or what you have read. My tuning is somewhat old school. Maybe because 2T's are?
On my engines, via my own and others bad and good experiences, I have come to always tune ignition timing first, then fuel/air tune to it, (and the pipe) and lastly CVT tune to get the most poop to the ground.
Ignition timing is as hard to get right as anything I have done...but it it the most often overlooked. SO, I think you asked the right question. When racing TZ's, I never had a problem with tuning on the West coast of the US, but always had problems at Daytona. I simply had too much advance. Atmospheric pressure and humidity screwed my brain sideways. Even morning (practice and qualifying) were so much better than the afternoon races.
Not sure if your desire for the right combo is near those limits, but I suspect you are on the right track. If you have good records and know the best setup to date...sneak up on timing with the OEM setup. A tenth of a degree advanced...when the power is on the pipe, is a lot.
If you can map your ignition curve, or at least read it...you can get a visual of what it's doing. Not sure what is available today. I am fairly sure that no ignition manufacturer will provide their units specs.
A good data acquisition system will record it...likely along with a dyno setup. It can be quite different under load than static.
An EGT probe? Nice. Consider the method of ignition bumping with no other changes...until you are scared. Then back it off by half of your setup and try air/fuel tuning.
BTW...I am not a fan of tuning an air box with no snorkel..it is the device that adds air volume/pressure to your box. The tuning parameters for 2t fun and pleasure are snorkel length and girth. (and more)
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Post by ThaiGyro on Oct 25, 2020 14:42:20 GMT -5
Glad you found it!
No spark...or low spark. May be before your time:
"And the thing that disturbs you is only the sound of The low spark of high-heeled boys"
Traffic- 1971
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Post by ThaiGyro on Oct 10, 2020 16:56:12 GMT -5
I would worry more about side play and crank bearing play. Your photo does not look bad. Might just be great.
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Post by ThaiGyro on Oct 3, 2020 15:14:11 GMT -5
Nice one cento...come to the west next trip over. I am currently near family in Montana. Fifth largest state, only 1.2 million people. Ten bazillion animals. We have wild turkey, deer, bears, elk and way too many birds in our yard constantly. We have many, many breweries. We can get wine We eat tasty animals, but must hunt your own, or have good friends. I have good friends. You can get lost...but so what? People are very helpful and happy and look you in the eye. I have a 5 speed and a 6 speed, both manuals. Fuel is cheaper in Montana...regional pricing. Poor local economy.
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Post by ThaiGyro on Sept 30, 2020 20:44:29 GMT -5
I am old and have been everywhere except Hawaii and Maine. My biggest recommendation is to not travel on Interstate highways...the ones that show I-80/I-5/I-10 and like that. Travel the U.S. highways (or smaller) and stop at every point of interest. You will find adventure and fun!
There is nearly no good points of interest on Interstates anyway. They are fast, but so boring.
Here is an example of one you missed: US-93...it runs from near Las Vegas, North to the Canada border. Only three states, but WOW...desert to mountains. Watch out for elk and deer. Hint: drive during the day or go slow after dark.
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Post by ThaiGyro on Sept 30, 2020 20:31:33 GMT -5
Welcome! You found the right forum. There are many scoot freaks here, yes including Tao-Tao and other China scooters.
Just ask what you need and someone will jump in.
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Post by ThaiGyro on Sept 27, 2020 16:10:06 GMT -5
i would take off ur air filter and cover it with ur hand while riding and try to get ur thumb in there with other hand on throttle steering and reving as your moving slowly finger fuck the air hole and see it has more power at the low end with more air and may need choking at high rpm i did it on mine and now i ended up with a stock airbox 72cc malossi big bore and yasuni r exhgaust Uhhh, well said...oh what a feeling!
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Post by ThaiGyro on Sept 5, 2020 15:08:20 GMT -5
Have you taken the cylinder back off? Seems like a crank bearing...but could be a small end bearing? Just fishing...I would not run it. If not obvious with the usual wigglin', pull the top end and wiggle the exposed parts.
Something is cod like in there.
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Post by ThaiGyro on Aug 30, 2020 16:33:15 GMT -5
I do like aeroxbud offers...usually gets you close. I have even mixed weights...say 15 and 10 to get 12.5.
You can also consider fork caps with vents. I use them on many bikes for fine tuning. The idea is to start out equal to ambient fork pressure, with you sitting on the bike. (Vents slightly cracked open, then have some one tighten them.) Ride. Too soft? Mark the tubes with fine tape and then gently raise the bike a mm or two. (Vents cracked open to let air in) Close again and test. Too stiff? Do the opposite. Bleed a bit out. Uhh, the tape works different in this direction....you can pre-mark the tubes with the tape, allowing for the desired mm drop.
It really takes two peeps.
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Post by ThaiGyro on Aug 30, 2020 16:12:56 GMT -5
I agree with geoffh, it would be nice to preload a tapered two piece bearing, but that is only good for a small window...or start out a bit too loaded and let it break in. Too much tear down for me. Race bikes, OK. That is why I went with ceramic rollers. 6204's are common.
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Post by ThaiGyro on Aug 10, 2020 23:00:04 GMT -5
190mech has some good points. Luckily, you do have a carb that is designed for two strokes. However, the classic problem with 2T's is that you likely have too many things to diagnose for any experienced tuners to grasp.
My rule, when ever possible: Change one thing at a time and test. That may seem crazy or unlikely...but I run a 17.5 on a few of my 49cc engines....even a 19mm on one.
I am guessing that someone here has your "intended" setup. My current suggestion is to set everything back to OEM stock, if you can. Ensure that your case has no leaks, ignition is properly set...and then play. If you can get the old 49cc running with that carb...you just might have a start.
Proper ignition, clean exhaust, no leaks. Then begin.
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Post by ThaiGyro on Aug 4, 2020 20:04:10 GMT -5
Hey shoom...what the boyz said is good, and you might consider checking your "pickup" coil. (Hall effect coil?) I have had many of those fail from heat on race bikes and hot temperature riding. Often they will start, then overheat. Just a thought...
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Post by ThaiGyro on Jul 29, 2020 16:07:47 GMT -5
Hey all...I promised pictures of the Hondamatic CM 400. Due to Covidity and resulting restrictions...I cannot return to stay with my friend or work on her motorcycles.
She is a food service provider. She cannot afford to potentially compromise her business. My family just had a "gathering", thus peeps from all over the US...Self quarantine for 14 days.
WHAT? whatever...pictures and more of the CM 400 to come.
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Post by ThaiGyro on Jul 27, 2020 22:45:16 GMT -5
Where the men are men and the sheep are scared. Just a point of likely fact...the sheep here are Rocky Mountain Big Horn's. They are not scared...they are grateful....but the Rams? not havin' it!
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Post by ThaiGyro on Jul 26, 2020 23:42:37 GMT -5
lilpenny,steveb and all. The fifth largest state in size, but just 1.2 million peeps. Lions and eagles and bears and trout fishing!
It is beautiful! The craft beers good too.
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