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Post by maker1to2 on Feb 25, 2018 17:40:12 GMT -5
alittle back story:
got a polini bore and crank put in a year or few ago. The bike sat up until a few months with a rag in the 2 wholes in a rainy area but covered.
got a pro to jet etc the bike. did 500 miles had a temp gauge. went over 350 F about twice: ...366: low tire pressure and 40 pounds of laundry was the cause...still ran good after.
Ok here is the problem
a few weeks ago it was raining heavy had to drive threw 6 small lakes. made it to the road. drove about 5 miles. got to a stop sign on a hill to head to town. The bike died. cranked it up. it started drove about a mile died again. did the same for about mile and half then stopped period! heard a ring sound the last few times it died.
tests:
compression test: 110psi about 20 kicks throttle on wot ....dtopped n stayed on 90psi
spark test: looked like it was erratic
kickstart would get stuck at the bottom a few times
looked at the piston through the exhaust port ? question are rings suppose to extend from the piston on a 2 stroke or close in the piston groove
saw consistent vertical marks on piston
cracked open the stator cover etc. stator was dirty. look like dirty water got in...or alotta dust. cleaned with electrical cleaner. still in the cleaning stage: ran out of cleaner.
while I wait the question
is there a possibilty I can clean the stator put some dialetic grease on it, etc etc, and it works?
is the piston rings suppose to be close in the piston grooves?
is the piston and walls suppose to have vertical marks or can it function?
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Post by 'O'Verse on Feb 25, 2018 18:54:55 GMT -5
Just an educated guess from reading your post. Hard to just diagnose without actually being there. But I'd say back when your temps reached 360 degrees you were in the process of having an air leak. Your bike shut off because of heat. You "soft seized" multiple times till you actually heard metal bouncing around in your cylinder. The streaks your seeing through your exhaust port was indeed from your heat seize. Hard seized your back tire would have locked up. Chances are if your seeing streaks threw your exhaust port on your piston. Than the air leak was possibly exhaust related. Hard to tell until you've actually pulled the cylinder and have a closer look. 110 psi is ok. But 90 psi is not  . As far as your stator goes I'm sure there's somebody here that can help you out in the electronics dept.. But I'd avoid going swimming with your scooter in the future. Haha! |
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Post by ryan_ott on Feb 25, 2018 19:08:50 GMT -5
Polini cylinders usually are tight when new, close piston to cylinder clearance. They should be run rich and gently for the first tank or so for it to “loosen” up. Very likely when the CHT was 366 the cylinder put the squeeze on your piston causing those streaks. The rings should be fairly close to the piston as long as they are positioned in their groove properly. Give your kick start gears some grease to prevent it from getting stuck. I’d pull the head and give it a once over and give it time to dry out before performing and ignition tests. More then likely the motor will be fine if it’s a cast bore the water is the culprit here.
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Post by maker1to2 on Feb 25, 2018 23:59:58 GMT -5
As far as your stator goes I'm sure there's somebody here that can help you out in the electronics dept.. But I'd avoid going swimming with your scooter in the future. Haha! this an my lowered acura has had trouble ..yea experience and prep is everything! |
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Post by jackrides on Feb 26, 2018 11:54:21 GMT -5
Rings. They should close in the ring groove with a small gap. They are shot. Order rings, piston circlips, base gasket. Head gasket replacement optional but recommended. Remove the cylinder and hone or sand it as explained in other posts here. It won't need much. Clean it really well! Remove the piston and sand it horizontally with 220 wet sandpaper to remove any raised material and restore at least some of the tiny (thousandths of inch) horizontal grooves (they help hold oil). Clean Really well! Reinstall with the same side facing the exhaust and oil on all surfaces(including the cylinder) and use new circlips with the gap facing up or down. Gasket surfaces must be clean and Not scratched. Rings can be squeezed closed with one hand while the cylinder is slipped over the piston. Put a drop of oil on each cylinder stud and tighten finger tight. Now use a torque wrench, going diagonally, to tighten snug, to 1/2 final torque, to final torque twice. Use a torque wrench on the new spark plug. As stated above, you may have an air leak, so be sure there aren't any where the intake and carb attach to the cylinder.
Stator. Once clean and dry should be fine. Seal (with a nonhardening sealer) the hole where the wires come in and between the wires where they come out of their outer sheath. Use a new gasket or a light coat of nonhardening sealer on the stator cover mating surface.
Read the posts on this site about the cylinder and piston removal! Ride On!
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Post by jackrides on Feb 26, 2018 11:59:44 GMT -5
OOps! The ring gap must be around the tiny pins in the ring grooves.
You may need to jet 1 size richer which will reduce engine temp under load. How low was you tire pressure? What is your elevation?
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Post by maker1to2 on Apr 22, 2018 20:06:30 GMT -5
finally got stator off and cleaned it. It was dusty. got spark yet did'nt crank motor. let it sit for a few weeks and now it doesn't spark at all or is erratic. talked to a pro. he said when they go bad they act sum timey. side note compression is back up to 150 crazy...new diaphram for the fuel line doesn't want to work...bye passed it for the test...so gas, compression, air is good.....ANYONE have a used stator, tail light lens, and turn signal lens for a jet50?
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Post by maker1to2 on May 18, 2018 15:25:59 GMT -5
Picked up a stator from partsfromscooters.com (2 stroke 1pe40qmb)...was told the (jog50) stator would work if I bought a magneto with it...has anyone tried this or am I number 1.
Differences
1. 1pe40 has 7 spools adly jet50 has 6
2. Plate bolt holes are at a different degree..(1 degree or 2 off)
Problem original stator bolts touch the new magneto...going to get 2 bolts with a smaller head
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Post by maker1to2 on May 24, 2018 17:31:29 GMT -5
Changed the 2 hex stator carrier bolts to a flat head. Now the magneto doesn't scrub bolts. Now the last stator swap problem: The magneto doesn't lock on the crank...I'm thinking this woodruff key could change it www.partsforscooters.com/Crankshaft_woodruff_key_50cc-2?ext=FOr The magneto inner diameter is wrong for the crank Side note: new stator solved the intermediate/no spark! |
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Post by maker1to2 on Jun 1, 2018 2:33:32 GMT -5
Ok
To finish this problem .......:
As of right now what I found out
The reason for the erratic spark was because of a weak ground...specific ground on the adly...the 1 connected with the ignition coil nut...the frame got rusty from being left outside under a tent without body parts..
The score on the piston...from a bad oil pump..
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Post by maker1to2 on Jun 1, 2018 2:35:52 GMT -5
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. As far as your stator goes I'm sure there's somebody here that can help you out in the electronics dept.. But I'd avoid going swimming with your scooter in the future. Haha! 
