Pocket Bike Question Leakage!

3148 Views 20 Replies 5 Participants Last post by branman101, Dec 20, 2012

pocketbike360

Discussion Starter · Aug 13, 2012 (Edited)

hey guys,

i just replaced the carb on my 110cc x7, put in new engine oil. But the bike does not start after a couple of kicks. only after i spray some starting fluid, then it shuts off, and that's only if you hold down the throttle. also when it started, there seemed to be black oil dripping from where the exhaust pipe is attached to the engine. what can this be?

let me know

thanks

1 - 20 of 21 Posts

CAM2

· #2 · Aug 13, 2012

Pull the sparkplug to see if its wet or dry............sounds like an improperly set float or air/fuel adjustment,,possibly improper jetting

What carb did you install?

pocketbike360

Discussion Starter · #3 · Aug 14, 2012

thank for the quick reply CAM2,

i will check if the sparkplug is wet or dry, if it is wet then what can be the problem.

also for the carb i installed a PZ19 Carburetor
Engine Opening O.D.: 19mm.

http://www.ebay.ca/itm/280733447188?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

thanks

EPR

· #4 · Aug 14, 2012

I would drop the float bowl, check the float & needle by eye. Unscrew the pilot jet and make sure it's clean, the hole is very small, clogs with spit.
Will not run or idle if its clogged, and don't say It's New, cause it don't matter.

CAM2

· #5 · Aug 14, 2012

pocketbike360 said:
thank for the quick reply CAM2,

i will check if the sparkplug is wet or dry, if it is wet then what can be the problem.

also for the carb i installed a PZ19 Carburetor
Engine Opening O.D.: 19mm.

http://www.ebay.ca/itm/280733447188?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

thanks

When supreme carbs like Sudco are shipped theres usually something in the bowl to prevent the float from being jarred.....

All others ship as-is because the fact is many would just install the carb and have problems......

Your float may of got knocked out of adjustment during shipping......One thing for sure you definately need to drop the float bowl and do some mods to it to make it run and start-up like it should...............

Theres a rectangular tab casted into the bottom of the floatbowl...its a tab that holds the float so high that fuel just dribbles into the floatbowl with a weak anemic flow so when you run the engine for like two-3 miles wide open and release the throttle the engine just shuts off for no reason...then you have to restart by then the bowls just catching up on fuel...this endless cycle will burn an intake valve right quick

upgrade the fuel delivery to 1/4',,do the floaty restrictor tab removal mod

set the float to 10 degrees,,set the air/fuel mix screw to 2 full turns out and set the c-clip on the needle to the 4th notch............

Make sure you install the plastic isolator between the carb and the intake the right way aswell....................Good Luck

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pocketbike360

Discussion Starter · #6 · Aug 15, 2012

thanks for the input, i will follow this guideline to set my carb. but i also had another question. i have another 110cc x7 which is yellow. it had the same leaking problem. the engine i have taken off the bike . i have set my other red x7 110cc aside which had had the carb problem. but my yellow one has a leak, the oil drips out the exhaust pipe to where it is attached to the engine, only when started. would i have to replace the o ring rubber circles that are found near the intake and exhaust valves. this was told to me. but I'm not 100% sure.

please help guys .

thank you

CAM2

· #7 · Aug 15, 2012

pocketbike360 said:
thanks for the input, i will follow this guideline to set my carb. but i also had another question. i have another 110cc x7 which is yellow. it had the same leaking problem. the engine i have taken off the bike . i have set my other red x7 110cc aside which had had the carb problem. but my yellow one has a leak, the oil drips out the exhaust pipe to where it is attached to the engine, only when started. would i have to replace the o ring rubber circles that are found near the intake and exhaust valves. this was told to me. but I'm not 100% sure.

please help guys .

thank you

sounds like cracked valve guides.....youd only get smoke mostly if just the valvestem seals were bad.......

how much oil r u putting in?? crankcase capacity is only 800ml which is a tad over 3/4 of a full qt....

pocketbike360

Discussion Starter · #8 · Aug 15, 2012

hi,

thanks for the quick response, i usually put about 3/4 of the bottle. i have provided pics that were taken a while back. the pics are under the "leakage" album. once again the oil is a dark shade of black that leaks from the exhaust pipe that's attached to the engine. so i would have replace the intake valve guide
& the Exhaust valve guide. is it a fairly easy job.

http://www.pocketbikeplanet.com/album.php?u=56352

thanks

MathieuOuellette

· #9 · Aug 15, 2012

might need a new exhaust gasket aswell.... low back pressure makes a cold motor hard to start.

CAM2

· #10 · Aug 15, 2012 (Edited)

pocketbike360 said:
hi,

thanks for the quick response, i usually put about 3/4 of the bottle. i have provided pics that were taken a while back. the pics are under the "leakage" album. once again the oil is a dark shade of black that leaks from the exhaust pipe that's attached to the engine. so i would have replace the intake valve guide
& the Exhaust valve guide. is it a fairly easy job.

http://www.pocketbikeplanet.com/album.php?u=56352

thanks

sometimes its not that easy...These chinese engines are weak azz as it is with the valve springs...If you run the engine extremely lean youll weaken the springs so much they float the valves...once you get valve float you get interferrence and contact between the valve and the piston...when that happens you get a wicked crack and possible bent valves thats fixable only buy buying a new head............

if you do have to replace the head i suggest hp valvesprings and a homemade headbreatrher mod....Good Luck

pocketbike360

Discussion Starter · #11 · Aug 15, 2012 (Edited)

hey,

thanks for the suggestions, i have the same leakage on both of my bikes. do you think i should buy new heads. or is there some sort of tutorial that can be found. i really don't want to spend a lot of money on these. i rather do the job my self if it's not that complicated.

thanks guys

CAM2

· #12 · Aug 16, 2012

pocketbike360 said:
hey,

thanks for the suggestions, i have the same leakage on both of my bikes. do you think i should buy new heads. or is there some sort of tutorial that can be found. i really don't want to spend a lot of money on these. i rather do the job my self if it's not that complicated.

thanks guys

first check and see how tight the head stud nuts are...the chinese only install them finger tight...you may luck out......

If not remove the head from one bike,,pull the exhaust valve spring,,drop the valve and look for the damage................If its fixable repair it and then move onto bike #2........

Like I said if the casting is cracked alnog with the valvegiudes then youll need a new head...or a couple of them.............Good Luck

EPR

· #13 · Aug 17, 2012

Look around on eBay, I got a whole 110cc head, cam rockers and all for $36 to my door w/ free shipping. New sellers sometimes give stuff away to get a name online.

pocketbike360

Discussion Starter · #14 · Aug 22, 2012

i found a tutorial on replacing valves.

http://www.youtube.com/watch?v=VNl0eypfQK4

CAM2

· #15 · Aug 26, 2012

pocketbike360 said:
i found a tutorial on replacing valves.

http://www.youtube.com/watch?v=VNl0eypfQK4

Yeah but where does it show how to fix a cracked head if it is...You cant just replace the valve guide because it will crack...If your handy you can actually fix cracked aluminum heads with this stuff....................

http://www.aluminumrepair.com/video_new.asp

pocketbike360

Discussion Starter · #16 · Aug 26, 2012

if the casting around the head is cracked, then i would need a new head. but what if only the valve oil seals are bad, if your already taking it apart. might as well replace the valves. but it's not normal for oil to be dripping only when the bike is running, out of the exhaust port from the head. is there a good chance that both bikes heads are that damaged. so should i start on one bike by taking the valves out and looking for damages in the head.

let me know guys,

but the video is helpful.
also can i pick up new heads/or just the shells at a local bike shop.

thanks

CAM2

· #17 · Aug 27, 2012

pocketbike360 said:
if the casting around the head is cracked, then i would need a new head. but what if only the valve oil seals are bad, if your already taking it apart. might as well replace the valves. but it's not normal for oil to be dripping only when the bike is running, out of the exhaust port from the head. is there a good chance that both bikes heads are that damaged. so should i start on one bike by taking the valves out and looking for damages in the head.

let me know guys,

but the video is helpful.
also can i pick up new heads/or just the shells at a local bike shop.

thanks

I think somewhere in this thread EPR says that pocketbikeparts or ebay has e22 heads pretty cheap;-something like $36 bux shipped or close.......

Your gonna have to pop the head to see what the problem is.....Hopefully its an easy fix...I never had an engine drip when running unless something was badly damaged inside or installed wrong........

If the head studs are really loose Id try tightening them in a criss cross pattern then try to see if the drip stops........if so then its gonna be an improperly torqued head gasket........

Yes the vid is very helpful...I agree on that part................Good Luck Yo

branman101

· #18 · Dec 20, 2012

i got a a 49cc pocket rocket that my buddy was throwing out and everything is there has fuel and no spark problem is i dont have the main memory computer or coil sucky part is there is no other way to get spark to see if it'll run for temporary purposes is there ?

CAM2

· #19 · Dec 20, 2012

branman101 said:
i got a a 49cc pocket rocket that my buddy was throwing out and everything is there has fuel and no spark problem is i dont have the main memory computer or coil sucky part is there is no other way to get spark to see if it'll run for temporary purposes is there ?

Is it 2 stroke or 4 stroke.?

branman101

· #20 · Dec 20, 2012

it is a 2 stroke

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