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Post by Upgrayedd on Jul 8, 2014 14:20:02 GMT -5
wouldn't hurt to get a small bottle of octane booster and add some to a tank, bump it up to around 100 oct. and see if that clears it up.
the higher octane wont hurt it, itll just up the temp/pressure that the fuel autoignites at, and make it burn a little slower.
if octane booster clears it up, you might could clear up the spark knock by retarding the timing a bit, or lowering the compression with an extra base gasket.
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Post by stevec on Jul 8, 2014 18:55:41 GMT -5
before the performance CDI it pinged like mad and at the time it had very heavy weights. it has a lot of power and runs great, i will try some octane booster and see what results. thank you for the info.
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Post by stevec on Jul 11, 2014 11:54:27 GMT -5
added octane booster, about 2oz and pinging is still there though not as bad and only under load or WOT. i don't want to add too much and fry the engine, there has to be a mechanical solution. i replaced the coil, CDI and plug and it didn't change the pinging but i did get more pep. i run 93 octane all of the time. 13g sliders gave it more acceleration and bando belt replaced the broken cheapo chinese one that broke. a friend of mine has a 157QMJ and with same gas from same station and pump his does not ping. i had it up to 60mph by GPS with a little room left on throttle was at around 7500epm.
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Post by stevec on Jul 12, 2014 19:12:54 GMT -5
now i have a noise coming from inside CVT, have to pull cover tomorrow to see what could have gone wrong this time. it rides fine but has the noise like metal rubbing, i wonder if the kick start is falling apart or the variator is shot. i paid $800 more for this than the taotao evo 150 sells for, i think propel is just a glorified taotao, i may just sell it when the title comes in from DMV and buy a used honda helix.
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Post by stevec on Jul 13, 2014 15:22:46 GMT -5
noise coming from variator, it is no good i have to get a new one for my new scooter. should have bought the taotao.
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Post by stevec on Jul 20, 2014 20:18:32 GMT -5
i need help, i am still pretty new with 150cc engines, my specialty is 139QMB engines. i have a metallic rattle when scooter is idling and it picks up speed when i accelerate. i checked the variator and nothing inside is broken and nothing in it rattles. i took it off and with the sliders in it i shook it and nothing is loose. i had it running with the cover off and it is definitely coming from the variator area. the kick start is not hitting, i can see the gear behind the variator spinning and the gear for the kick start is nowhere near it. ir shifts all ranges perfectly up and down so the variator and clutch are both working fine. it rides fine except the damn spark knock or pinging. i think the rattle might be from the starter drive not fully releasing and i am ready to order a new one if needed. the pinging is driving me nuts, i added a good amount of octane boost and there was no change at all, i thought there was but i was wrong. not just WOT but on take off is pings before it starts accelerating. changing the CDI, coil and spark plug made no difference. i am ready to say the hell with it and just order a new engine from scrappy dog. i'm just afraid the new engine will have the typical vibration that a lot of them have. mine does not have the vibration, it rides very smooth. i don't want to drill the pickup coil to adjust timing, it should be fine where it is. it starts right up every time so i assume the timing on the cam chain is correct.
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Post by niz76 on Jul 20, 2014 20:33:53 GMT -5
I've been adding octane booster to my gas after reading about the gas pump idea it makes sense on a 1 gallon fillup. I'm also running no head gasket. I just kinda pour a decent little gulp in each time I fill up. Not too much math involved but the bottle just says to add whole bottle to a 15 gallon fill-up. So I am shooting at 1/15th of the bottle every gallon I pump Now I wouldn't feel right running my scoot without it...
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Post by stevec on Jul 21, 2014 5:37:04 GMT -5
the octane boost does nothing for it, it still pings.
looked at starter drives and they can't hit while it is running. the only thing it can be is the oil pump chain is loose on that side. that means it is probably chewing up the block when i ride it.
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Post by stevec on Jul 21, 2014 19:51:57 GMT -5
ordered a new oil pump chain today. i will be putting in a new starter drive gear and variator at same time. the noise does sound like a chain touching metal, i checked the timing chain and it is right. the timing is right on the mark and valves are correct. i noticed it is burning a little rich so i decided to order a new carb from scrappy dog so i can adjust the fuel air mixture. hopefully all of this will fix the pinging and rattling.
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Post by stevec on Jul 22, 2014 8:53:24 GMT -5
engine is knocking at an idle, not all of the time but most of the time. i guess whatever it is has progressed and my only choice now is a new engine. good news is i will have some steel and aluminum to cash in at the scrap yard.
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Post by 90GTVert on Jul 22, 2014 12:01:55 GMT -5
Sorry it's getting worse. At this point you could tear it down and go over it or if you need it daily wait till you get a new engine if you think it is major failure. Could build a spare... or a spare big bore/stroker as long as the cases and such look alright.
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Post by stevec on Jul 22, 2014 14:12:16 GMT -5
listening closely it isn't a knock it is the chain hitting at low rpm, i hit gas and it goes to the metal dragging metal like a loose chain sound. i ordered a new oil pump chain for it. saturday i will order more parts, i have to save up for the 59mm kit from scrappy that has the ceramic coating so i will have a new jug and piston, going to keep my stock head, 2mm difference in piston size is ok to use stock heads.
i will have a new 59mm piston and jug, new starter drive gear, new oil pump chain, new carb, new koso variator that i will use my 13g sliders in. new variator fan. oh and a new iridium plug, the one in it now is just about shot, went from burning clean to running rich and getting 33 miles per gallon of 93 octane gas, i literally burned a full gallon of gas on a 33 miles run and it is losing major power up hills. i can hit 25 on a hill where i used to get almost 40mph. 45 on a flat where i used to hit 50 at 3/4 throttle. hopefully i make enough money to order all of the parts saturday. if this don't fix it a flamethrower and a new scooter will lol.
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Post by stevec on Jul 24, 2014 19:05:31 GMT -5
put a hot dose of sea foam in gas today to get rid of carbon buildup possibly causing pinging. within a few miles i gained some power, after half a tank the pinging is very light. there is hope for the engine yet. had a friend come over today and help me pinpoint the rattle from the engine before i decided to take it all apart. it was traced down to the variator itself and not the pump chain which made me pretty happy. i looked at the variator and it looks fine but it is making a rattling that increases with acceleration. the sliders are brand new kosos and they are fit properly and it shifts fine. i will be ordering a makuni carb saturday, i don't need a new top end, i will order new variator soon, the current one is noisy but it works, actually hit 55mph on a flat which isn't too shabby.
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Post by stevec on Jul 25, 2014 18:47:52 GMT -5
this is odd, all i did was run sea foam in the gas, i got more power, it still pings but only under heavy load not all the time like before and today i went on a 30 mile ride and only used a half gallon where before it would have swallowed a whole gallon. i haven't even installed anything new yet.
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Post by stevec on Jul 29, 2014 21:06:29 GMT -5
Still haven't ordered anything, had to spend money to fix my car. i am thinking i can drill the cover over the mixture screw and lean it out a little so there is no more carbon buildup. there is still the loud rattling which sounds like the variator but it is still running good. changed the oil today, it was pretty dirty, haven't been able to keep accurate mileage on when it was last changed because of the cluster issues i was having.
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