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Post by twitchytoes on May 26, 2018 15:19:03 GMT -5
Once the heat started coming in in Illinois, I rechecked valve clearance and retuned my carb (18mm keihin) based on what felt right. IIRC, I have either an 88 or a 90 in it and a 34 pilot. I'm using the stock airbox with the restriction inside removed, and the 5-hole cap removed (and a small diagonal cut pvc to block water going in it). I had adjusted the valves to 0.003" and 0.004" when I did it then. Recently, I decided to try the manufacturer spec valve clearances, which equate to 0.0025" intake 0.003" exhaust and it seems to have helped SOME but not entirely. Not only that, I seem to have lost some power as well, I don't quite hit 35 anymore. When looking inside my exhaust, there's quite a bit of black and I'm wondering if I'm running overly rich. I'm about 800ft above sea level, and I've not had much luck tuning my carbs on this or the previous scoot I had. If anyone could toss some advice, I'd really appreciate it. I also installed an iridium plug on it, as well.
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Post by tocoo on May 27, 2018 4:06:31 GMT -5
the usual jets for my generic carb with black top is 30 idle jet and 80 main jet
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Post by greginisn on May 27, 2018 4:12:14 GMT -5
Is the auto enrichment circuit working OK? Carb clean and no blockage to enrichment passages? Partially cover the intake snorkel thing for greater enrichment?
Greg
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Post by twitchytoes on May 27, 2018 10:18:06 GMT -5
Is the auto enrichment circuit working OK? Carb clean and no blockage to enrichment passages? Partially cover the intake snorkel thing for greater enrichment? Greg As far as I know, it works okay. I can try reducing my intake and taking a ride to see how it acts but in previous attempts (colder weather though), it really didn't like that. |
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Post by greginisn on May 27, 2018 18:05:16 GMT -5
To get on the same page here, What do you call cold. My TaoTao thunder started easily and happily at 40F. Colder weather than I want to ride in figuring chill factor & all but the motor was willing.
Greg
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Post by twitchytoes on May 27, 2018 19:14:10 GMT -5
To get on the same page here, What do you call cold. My TaoTao thunder started easily and happily at 40F. Colder weather than I want to ride in figuring chill factor & all but the motor was willing. Greg I have ridden as low as -5. I call lower than 30 cold. |
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Post by greginisn on May 27, 2018 21:37:48 GMT -5
I did that once in Havre Montana in winter of '63 - '64 riding a two stroke Tohatsu. I figured it would be easy to start cuz no crankcase oil forgetting about gear oil. Couldn't even Idle in neutral for 5 or 10 min with the cold transmission oil but finally it got warm enough to spin the gears. Never again, just too damn cold out there sometimes.
Greg
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Post by twitchytoes on May 28, 2018 0:35:17 GMT -5
I did that once in Havre Montana in winter of '63 - '64 riding a two stroke Tohatsu. I figured it would be easy to start cuz no crankcase oil forgetting about gear oil. Couldn't even Idle in neutral for 5 or 10 min with the cold transmission oil but finally it got warm enough to spin the gears. Never again, just too damn cold out there sometimes. Greg I had no issues getting started up or idling. Just forget electric start when it's that cold. Kick start only. |
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Post by GrumpyUnk on May 28, 2018 11:45:45 GMT -5
When you swapped in the plug, what did the old one look like? Was it covered with soot? If so, running too rich. The exhaust pipe can be black, but if it has a thick coating of soot, again, too rich.
I think that runnig a good bit, then parking and letting things cool down, and THEN removing the spark plug for inspection would give a good idea of the mix. It should not get all coated in the short while from riding to parking. Coasting down to a stop engine off is not necessary, IMO.
If too black, go a size smaller in the main jet. An alternative, possibly, would be to have someone follow behind as you cruise, looking for tell tale of black smoke out the tailpipe. Black smoke indicates too much fuel, which is expelled as partially burnt smoke & carbon. You do want to ride a god bit after startup as the electric choke will be rich, and may cause black soot on the spark plug.
tom
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Post by twitchytoes on May 28, 2018 16:03:36 GMT -5
When you swapped in the plug, what did the old one look like? Was it covered with soot? If so, running too rich. The exhaust pipe can be black, but if it has a thick coating of soot, again, too rich. I think that runnig a good bit, then parking and letting things cool down, and THEN removing the spark plug for inspection would give a good idea of the mix. It should not get all coated in the short while from riding to parking. Coasting down to a stop engine off is not necessary, IMO. If too black, go a size smaller in the main jet. An alternative, possibly, would be to have someone follow behind as you cruise, looking for tell tale of black smoke out the tailpipe. Black smoke indicates too much fuel, which is expelled as partially burnt smoke & carbon. You do want to ride a god bit after startup as the electric choke will be rich, and may cause black soot on the spark plug. tom The old plug was a bit of an odd case, it kinda looked rusted. I really didn't know what to make of it, and if I recall, I had a 90 jet in when I took it out. Here are some pictures of it outside in sunlight. imgur.com/a/b1q5pgd
I can't recall if I have an 88 or a 90 in it right now but it's one of those two. I haven't had the spark plug out since I got done attempting tuning it. I've not noticed any black smoke myself and I've done some revs on the center stand. It also doesn't seem to be bogging like it's trying to burn extra fuel.
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Post by GrumpyUnk on May 29, 2018 12:22:45 GMT -5
Holy smokes, was someone trying to run it on rainwater? That thing looks rusted. Given that appearance, I wonder what the cylinder wall looks like. That's the kind of rust appearance you get when bare un-treated iron is left exposed to water. If you've run it since, it is what it is, so don't worry about it. Nothing to do now.
tom
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Post by twitchytoes on May 29, 2018 13:23:45 GMT -5
Holy smokes, was someone trying to run it on rainwater? That thing looks rusted. Given that appearance, I wonder what the cylinder wall looks like. That's the kind of rust appearance you get when bare un-treated iron is left exposed to water. If you've run it since, it is what it is, so don't worry about it. Nothing to do now. tom Yeah I have run it quite a bit since. I ride in pretty much any weather because its my main vehicle. I have put a scoop on my airbox tube so rain can't settle in it lol It may be like that because I had to burn through some old old gas from a gas can that I highly suspect was separated. |
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