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Post by lain on Feb 14, 2015 10:15:22 GMT -5
After installing my 50mm BBK with a  main, I also had a bit of bog taking off. For me, it was the needle clip needing to be raised. The other adjustment that may help is your accelerator pump, you may need to bend the "C" spring a little bit more to get a bit more pumped sooner. C spring? Where is that? What does it control? |
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Post by JerryScript on Feb 14, 2015 10:19:47 GMT -5
A video is worth a thousand posts:
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Post by JoeyBee on Feb 14, 2015 10:25:06 GMT -5
JS thanks for the tip. Do you have advice on what to listen for when tuning it. The video didn't clearly explain that part. |
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Post by lain on Feb 14, 2015 10:43:21 GMT -5
Hmm, just noticed while poking around that gas has been leaking from somewhere onto the top of my engine block... The gas line looks fine, squeezed it and no gas escaped from it anywhere... Could the gas be coming out of the carb? The gas is pooled right under the carb. It is hard to tell if it is coming from the carb but I don't see anywhere else, the carb is dry which makes me confused but then again gas does dry very fast.
I swear this is the theme of my life, just one problem after another... Never a dull moment!
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Post by rcq92130 on Feb 14, 2015 13:41:31 GMT -5
Might be a dirty or worn float valve, allowing too much gas into the carb float bowl than then flows past the needle into the carb venturi --- some of which would perhaps end up not in the engine but on the black. But if that was the case i'd expect your scoot to be running pretty badly ... and you say it is doing well.
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Post by alleyoop on Feb 14, 2015 14:17:29 GMT -5
Could be the Drain is leaking, leaking around the bowl or if it is a pumper could be leaking by the diaphgram cover. Like Rc said if it was flooding you would see fuel in the Air Filter side and most likely some would drain into the intake and would run like crap.
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Post by lain on Feb 14, 2015 14:21:30 GMT -5
Might be a dirty or worn float valve, allowing too much gas into the carb float bowl than then flows past the needle into the carb venturi --- some of which would perhaps end up not in the engine but on the black. But if that was the case i'd expect your scoot to be running pretty badly ... and you say it is doing well. the carb is fairly new. I wouldn't expect worn anything. I did take the cover off to change the main jet when I got it a month ago, but I didn't notice anything then but I also wasn't really checking. There's a lot of salt and sand on the roads, enough to slip on, so maybe something is clogged? It does seem like there is a slight accel lag sometimes. When it lags it boggs sort of or feels like it is vibrating harder, but powers through it in a second or less and overall performance is good. |
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Post by spudsmckinsey on Feb 14, 2015 19:16:47 GMT -5
Might be a dirty or worn float valve, allowing too much gas into the carb float bowl than then flows past the needle into the carb venturi --- some of which would perhaps end up not in the engine but on the black. But if that was the case i'd expect your scoot to be running pretty badly ... and you say it is doing well. the carb is fairly new. I wouldn't expect worn anything. I did take the cover off to change the main jet when I got it a month ago, but I didn't notice anything then but I also wasn't really checking. There's a lot of salt and sand on the roads, enough to slip on, so maybe something is clogged? It does seem like there is a slight accel lag sometimes. When it lags it boggs sort of or feels like it is vibrating harder, but powers through it in a second or less and overall performance is good. If it idles ok and is ok at 1/2 throttle and above, could the slow pilot jet be at play as well as the accel pump? |
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Post by JerryScript on Feb 14, 2015 21:07:31 GMT -5
Simple method for finding a leak: Dry it off, then toss a very small amount of flour on it. Take it for a spin, come back and see where the leak is, then clean up the flour.
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Post by lain on Feb 14, 2015 22:44:13 GMT -5
Simple method for finding a leak: Dry it off, then toss a very small amount of flour on it. Take it for a spin, come back and see where the leak is, then clean up the flour. That's a really good tip! |
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Post by lain on Feb 16, 2015 15:23:37 GMT -5
I tried adjusting the mix left for more fuel and it bogged out, so I tuned it to the right to more air and it seemed to work a little better but now sometimes rumbles on deceleration and lags on acceleration still. If this keeps up I am surely going to clean the carb out.
I haven't checked for a leak with the flour trick yet, the whole engine is wet after riding now since I am riding in just snow on some streets, but I will be checking that soon as I can...
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Post by JoeyBee on Feb 16, 2015 19:21:55 GMT -5
I tried adjusting the mix left for more fuel and it bogged out, so I tuned it to the right to more air and it seemed to work a little better but now sometimes rumbles on deceleration and lags on acceleration still. If this keeps up I am surely going to clean the carb out. I haven't checked for a leak with the flour trick yet, the whole engine is wet after riding now since I am riding in just snow on some streets, but I will be checking that soon as I can... I surprised you are even taking it out. The news keeps claiming you guys are getting a "biblical" amount of snow. My scoot would be sitting in the garage waiting for warmer weather. |
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Post by JerryScript on Feb 16, 2015 19:52:01 GMT -5
If the a/f screw helps when you lean it out (turning it clockwise), but you still get bog, then you need to either raise the needle by lowering the clip or adding washers as spacers, or you need to adjust the C spring on the accelerator pump, or you need to upjet your main jet.
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Post by rcq92130 on Feb 16, 2015 20:17:42 GMT -5
Yeas, Lain - thought this might help understand why JerryS said what he did:
Always remember there are TWO jets - and though they interact, the Pilot is primarily for idle fuel flow and the main primarily for open throttle fuel flow.
When you adjust the A/F screw you are setting proper mixture for the PILOT jet.
Once you get your scoot properly idling, you then need to set the MAIN jet for proper mixture. That's done by either raising the needle (washers) or upjetting.
Helpful?
ps: Feel for your weather woes. Here it's 5pm and the temps have already plummeted to 67 degrees! BRRRRR !!!!
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Post by lain on Feb 16, 2015 20:24:33 GMT -5
I tried adjusting the mix left for more fuel and it bogged out, so I tuned it to the right to more air and it seemed to work a little better but now sometimes rumbles on deceleration and lags on acceleration still. If this keeps up I am surely going to clean the carb out. I haven't checked for a leak with the flour trick yet, the whole engine is wet after riding now since I am riding in just snow on some streets, but I will be checking that soon as I can... I surprised you are even taking it out. The news keeps claiming you guys are getting a "biblical" amount of snow. My scoot would be sitting in the garage waiting for warmer weather. But it looks so sexy at night in the snow!  I see so the mix screw only changes the pilot, but would't that still affect the mix of the main jet as well since the pilot jet doesn't shut off when the main jet is in use does it? |
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main, I also had a bit of bog taking off. For me, it was the needle clip needing to be raised. 
..BAD TO THE BONE..
