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Post by steve on Jan 26, 2016 10:53:54 GMT -5
Hi, ya'll. Haven't been on the board in a while, hope everyone is OK. I have an issue, and cannot figure it out. I put a 52mm Hoca BBK and head on my scoot. It runs great, and purrs like a kitten. My problem involves actually getting it started. I have a high torque starter, and it turns over fine. Valve adjustment is good, and I have stock CDI on it due to kickback. The problem is that I have to turn it over forever to get it to start. Sometimes, it will start right up. I have a 20mm carb, and I messed with changing the idle jets, and it will start up fine for a week, or so, but then go back to taking forever. I will kill the battery, and have to get a jump start when this starts happening.
One thing I noticed, when I'm having to crank it forever, if I take the spark plug out, and put a new one in, it will fire right up, but the old ones are not fouled. I try them out, and they spark. I have a 94 main jet, and a 35 idle right now. Plug is nice, chocolate brown.
What am I missing? She's got spark, and runs absolutely fine once she cranks. It's turning over fine. When I jump it with a car, it will spin really fast, and still take forever. Is it flooding? 94 main does not seem too large for a 52mm bore. It performs best with a main over 92, but under 105. I got the plugs looking nice.
Hit me with suggestions.
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Post by steve on Jan 26, 2016 11:08:48 GMT -5
I had been putting some slightly used plugs in there when I swapped them. I just got some brand new plugs, and put one in. It has been firing right up today, but it has gone days before with no issues. I guess it's fouling plugs? But that's the same size jets I had when I had a 50mm bore on it.
Another thing I thought of. Do I need a larger carb than 20mm? Could that be the reason for the starting issues? Should I use the 150cc carb? And, will the 150cc intake manifold fit on a 50cc?
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Post by tortoise on Jan 26, 2016 13:05:17 GMT -5
Even less reliability . . and enhanced odds of crankshaft bearing failure.
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Post by JerryScript on Jan 26, 2016 13:24:43 GMT -5
I would re-check the valves.
Have you tried restricting the air intake, and de-restricting as well. This can help determine if the pilot jet size is right. How many turns out us your a/f mixture screw?
Did you increase your wire size to the new starter? The ground strap as well?
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Post by steve on Jan 26, 2016 13:53:14 GMT -5
Even less reliability . . and enhanced odds of crankshaft bearing failure.
I already changed the crank. It's a stroker. I'm just trying to figure out the starting issues. |
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Post by steve on Jan 26, 2016 15:39:38 GMT -5
Even less reliability . . and enhanced odds of crankshaft bearing failure.
I already changed the crank. It's a stroker. I'm just trying to figure out the starting issues. I did run 10g wire, from battery to starter. It turns fast. I will check valves again, but its only been like 60 miles, and it idles, and runs great, once it starts. I did play with the air intake. That's how I jet it, normally. |
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Post by JerryScript on Jan 26, 2016 17:37:11 GMT -5
I just noticed you have the stock CDI due to kickback. Believe it or not, stock CDIs are advanced, just not as much as performance ones. Now tvnacman has an advancing angle CDI that starts out not advanced, then advances as rpms increase. Helped with mine and several other's hard starting bbk issues. |
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Post by steve on Jan 26, 2016 18:16:02 GMT -5
I just noticed you have the stock CDI due to kickback. Believe it or not, stock CDIs are advanced, just not as much as performance ones. Now tvnacman has an advancing angle CDI that starts out not advanced, then advances as rpms increase. Helped with mine and several other's hard starting bbk issues. Which CDI is that? Can you link it? BTW, the new plug seems to have solved it. I left it in the cold all day, which would always trigger an episode, and it fired right up. It will not crank at all with a performance CDI |
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Post by tvnacman on Jan 26, 2016 20:14:02 GMT -5
NYCSP0007 check out the video with the timing light. John
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Post by steve on Jan 27, 2016 14:11:43 GMT -5
I don't understand why it would run fine with an old spark plug, but would not start, but that sure seems to be the case. I put a new plug in, and it's starting fine.
Weird, and I feel kinda dumb. Glad to have fixed it.
Has anyone had this issue with a spark plug?
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Post by tvnacman on Jan 27, 2016 14:20:35 GMT -5
Spark plugs can give all kinds of problems. I learn that the hard way in my teens. I've even seen ignition coils create hardstart issues.
John
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Post by steve on Jan 27, 2016 14:27:02 GMT -5
NYCSP0007 check out the video with the timing light. John I watched it, but I really don't know what I am looking at. Does it have no advance at low RPM, and it advances from there? |
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Post by tvnacman on Jan 27, 2016 14:49:33 GMT -5
NYCSP0007 check out the video with the timing light. John I watched it, but I really don't know what I am looking at. Does it have no advance at low RPM, and it advances from there? its at zero at idle, listen to the engine and watch what the light is lighting. When it gets to 3000 rpm it jumps to about 30 degree advance. John |
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Post by steve on Jan 28, 2016 9:14:08 GMT -5
Thanks, John.
That is the gold Casoli you sell, right?
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Post by tvnacman on Jan 28, 2016 9:52:37 GMT -5
What I linked you to is the ones in my inventory. I have tested exact cosmetic with different timing curve or no curve.
John
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