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Post by stevec on Jul 2, 2014 15:11:09 GMT -5
My 157QMJ is pinging like it has bad gas and i only run 93 octane. it is also misfiring at 8K on the tach, it feels like it is holding back at 7K. i checked the valves and they are dead on, the plug is burning clean. no vacuum leaks, no broken lines, no loose nuts on intake or clamps. top speed is 40mph now when at one time it would hit close to 70 on speedo. gas mileage sucks, i am getting maybe 45mpg. off and on it sounds loud at the air box like i am running an open performance filter. i am one of the lucky ones that has the air box under the seat. it idles beautifully at around 1,600rpm, no shakes or misses. i checked the timing and it is also dead on. it starts right up 1st try every time and never stalls, the auto choke seems to work.
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Post by stevec on Jul 3, 2014 9:50:46 GMT -5
i ordered a performance CDI, coil and NGK iridium plug, also some 13 gram sliders. i am hoping the pinging and misfire is from weak spark, i don't yet have a tester to test the strength of the spark.
if anyone has had similar issues please post a reply.
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Post by stevec on Jul 5, 2014 19:00:17 GMT -5
i installed a new performance coil and CDI, the misfire is gone and it seems to have more power. it was still not reaching a high speed until today after the stock belt snapped with only 1000 miles on it, i replaced it with a bando and now it accelerates pretty fast up to 50mph. the rollers that are stock weigh a ton, they have to be 17g, my 13g sliders will get here monday. anyone who buys a chinese scooter should put in a gates or bando belt as part of the PDI, you will break down if you have a chinese belt.
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Post by scooterpimp on Jul 5, 2014 19:14:02 GMT -5
I prefer the bando , they are a hair wider/thicker actually gained 3mph. Due to riding higher on variator ?
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Post by stevec on Jul 6, 2014 4:12:58 GMT -5
i gained a few mph i thought it was probably because the old belt was slipping though it didn't feel like it was.
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Post by stevec on Jul 6, 2014 19:52:38 GMT -5
the pinging was the engine under too much load from 17g weights, at least it isn't something serious. it is also drinking a lot of gas from being under constant heavy load. i have discovered that Propel is just a Taotao with slightly better quality control. i should have just gotten the Taotao Evo 150 for $1000 less, it is the identical scooter. i could have put some of the $1000 towards the PDI and some upgrades. next i will get a good carb and intake from scrappy dog, nothing that will need me to run a pod filter just something with better quality.
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Post by Upgrayedd on Jul 6, 2014 20:44:31 GMT -5
the pinging was the engine under too much load from 17g weights, at least it isn't something serious. it is also drinking a lot of gas from being under constant heavy load. i have discovered that Propel is just a Taotao with slightly better quality control. i should have just gotten the Taotao Evo 150 for $1000 less, it is the identical scooter. i could have put some of the $1000 towards the PDI and some upgrades. next i will get a good carb and intake from scrappy dog, nothing that will need me to run a pod filter just something with better quality. i could be off on this, but.. the way you just described it, with the heavy weights, sounds kind of like an engine lugging. not sure maybe if that's it, and certainly not saying you're wrong about it pinging, lot of times that engine ping is at a low rpm anyhow.
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Post by stevec on Jul 7, 2014 5:07:16 GMT -5
it is lugging and only pings under heavy load at low rpm, on level it takes off without pinging unless i go WOT. it always pings on hills and the rpms are very low, the rollers weigh a ton, they are definitely way too heavy. i assume that is why i am losing so much fuel mileage, the 13g sliders will go in today and i will know for sure on the pinging, i won't know about fuel mileage until the replacement cluster gets here this week.
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Post by 90GTVert on Jul 7, 2014 6:03:05 GMT -5
I've had the same on my TaoTao and on a past 4T scoot. They would spark knock from the strain on the engine trying to accelerate or cruise WOT with heavy weights. With lighter weights it went away and I was able to farther advance the timing for better performance without issue.
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Post by stevec on Jul 7, 2014 18:46:02 GMT -5
i installed the 13g sliders, it has a very slight spark knock on hills but moves along fine. i can take right off on a hill where before it would bog and take a while to start moving. also noticed a little bit better fuel economy. i have a blue CDI, orange coil and NGK iridium spark plug, i still want to get the 30mm carb kit from scrappy as long as i can keep my stock air box.
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Post by Upgrayedd on Jul 7, 2014 21:46:02 GMT -5
i installed the 13g sliders, it has a very slight spark knock on hills but moves along fine. i can take right off on a hill where before it would bog and take a while to start moving. also noticed a little bit better fuel economy. i have a blue CDI, orange coil and NGK iridium spark plug, i still want to get the 30mm carb kit from scrappy as long as i can keep my stock air box. random thought about gas... you may already be on to this: if youre running premium/high octane, consider that the gas stations that pump all their octanes through one hose, the first bit of that gas is whatever the last person pumped. the pumps that have separate hoses for every octane... i think (i might be wrong) the octane may end up better with such a small amount pumped, than having to empty the hose and pump of the last person's 87 octane, before the 93 starts to flow. i am fortunate that in my town, the only station that has separate hoses and pumps for each octane, is also the only gas station with non ethanol premium. getting the first bit of whatever the last person pumped probably wouldnt matter so much in a 10 gallon tank, but i usually only pump about a gallon when i fill my scooter.
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Post by stevec on Jul 8, 2014 4:49:22 GMT -5
i didn't think of that, i usually put in half or a little more of a gallon at a time, i top off when gauge it at 3/4 and it is a 2 gallon tank. my other 50cc scooters never pinged, this is the first time i heard a GY6 do that and i use the same station for gas, i ran the tank almost empty when the fuel gauge wasn't working and it did the same thing. the dealer i bought it from said it would run on racing fuel, i don't think it would be a good idea to try it. none of the stations where i am have the 3 hose setup anymore, i am most likely getting some of the cheap stuff when i put in gas. i could try adding a little octane booster to see if that will help it, have to be careful not to add too much.
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Post by 90GTVert on Jul 8, 2014 6:14:06 GMT -5
Also be sure you don't have a long reach plug. I've heard of this on other scoots and switching to a standard plug is enough to eliminate the spark knock.
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Post by stevec on Jul 8, 2014 10:39:52 GMT -5
it was knocking with stock and a tiny bit at times with the iridium, it is not a long reach. changing the weights made a huge difference, i think i shall name it the "propel knock" it is the only scooter i have been on that pinged. it is such a light ping now that i can't hear it if there is wind where before it sounded like a 1973 pinto going uphill.
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Post by stevec on Jul 8, 2014 13:36:09 GMT -5
kind of sounds a little like a diesel when it idles cold, wonder if i am supposed to be running diesel fuel lol.
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