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Post by frankj on May 28, 2018 9:36:30 GMT -5
Scootergate update: The exhaust was put back on, new bolts tightened, new gasket, everything secured and....................still nothingš. In fact, it sounds worse. Like it has nothing. Does anyone have anymore suggestions? I guess my next step is taking the reed head off and seeing what I got like Geoff suggested. If I could find a new engine or newer engine I woul go that route.
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Post by geoffh on May 28, 2018 15:30:09 GMT -5
frank,best to check the reed valve is ok and compression "thumb" test and report back,a new or different engine may solve the problem but if your keeping the scoot then you have to learn to fix and maintain it.2 stokes need love,If you wanted a shot in the dark my monies on the coil pack,cheap enough to try.
geoff
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Post by frankj on May 28, 2018 18:08:45 GMT -5
Thank u Geoff. What is the thumb test again?
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Post by geoffh on May 29, 2018 15:17:48 GMT -5
frank, just remove your spark plug and put your thumb over the hole and get some one to kick start the scoot you should feel some pressure against your thumb,its not very technical and will only help as a guide,if there is no pressure then it,s off with it,s head,
geoff
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Post by AtariGuy on Jun 1, 2018 4:17:03 GMT -5
Also, if the engine sounds -worse- because of the exhaust sealing up better, you could have a blockage in the exhaust pipe too. Have someone kick it over for you while you hold your hand close to the end of the exhaust and feel for air coming out. If you feel little if any, then it could use a clean out. Tons of youtube videos on cleaning 2 stroke exhaust pipes. The lye version would work the best, but its a terribly corrosive and hazardous method, so be absolutely certain you have every precaution ready if you go that route. Or simply dump it into a bed of campfire coals and tend it for a few hours while the crap burns out...
Also let us know what you find when you pull the reed cage - and be sure you use a thin coat of some rtv/ultragrey/yamabond on both sides of the gasket and clean the gasket mating surfaces on the engine and reed cage to make sure you get an airtight seal when you reassemble that. Your reeds shouldnt be chipped or cracked at all and shouldnt have any light shine through them when you look through the cage up to a light. If so, consider new reeds. Partsforscooters.com has some fiberglass and carbon fiber ones for a minarelli, safer to use than steel reeds.
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Post by ThaiGyro on Jun 1, 2018 7:40:58 GMT -5
Just my personal  ...as a mechanical engineer and former oil refinery reliability engineer...I suggest NEVER using heat to remove goo inside. It will work, but takes a long time and causes needless pollution. The big deal with high heat like torches and charcoal fires, is that you cannot control the temperature. It can cause premature failure to your welds...or any other weak point. It happens over time anyway, so why accelerate that? High enough heat cycles will cause metal failure, even in mild steel. Atariguy mentioned lye, that's ok if diluted properly, rinsed out after, then oil coat the pipe inside. I prefer to circulate a warm solution of solvent or fuel, like diesel or kerosene. Cheap, a bit stinky, but you can dump it in your Dad's Benz or Uncle Bob's Freight-liner, a bit at a time so it's not wasted. (Filtered, of course) No need to coat the pipe inside after...it's done. |
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Post by benji on Jun 1, 2018 8:12:58 GMT -5
I use a propane torch, but I've also seen people use heat guns and BBQs. The BBQ idea I like because you can control the temp somewhat. With the torch I just stick it in the inlet and let it sit. Propane doesn't get crazy hot like MAP or acetylene, and I keep.the torch kinda low after it starts smoking. After a while it will stop smoking so bad, and it's good enough to ride. The solvent idea may work better, but sounds carcinogenic šØ
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Post by frankj on Jun 3, 2018 19:43:39 GMT -5
Thank you everyone once again for the advice. Within the next few day I will try thumb test and check the muffler. I will post once I am done.
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Post by frankj on Jul 1, 2018 10:57:09 GMT -5
Okay.......about to get cracking on the scooter, never say die. Quick question, is the reed cage the same thing as the reed valve?
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Post by frankj on Jul 2, 2018 16:19:53 GMT -5
Okay, I did the thumb test and I have a lot of pressure when we tried to kick start it. Also, I feel a good amount of air exiting the muffler when we try to kick start it as well. And yet.......it still doesnāt start. Does anyone have a suggest on what my next step should be?
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Post by geoffh on Jul 3, 2018 15:28:49 GMT -5
frankj,you seem to have all the elements required for a start up,so to be blunt but kind recheck your work,take your time and rebuild as follows
reed valve (no gaps)
carb, reset mixture screw,do you have light through the jets,is the needle clip in the centre slot,
air box all sealed up,
and finally are you putting it back together completely before you retry,sorry if I sound pedantic but untill it coughs back to life check and recheck,keep pluggin on
geoff (maker of many woefull errors)
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Post by frankj on Jul 5, 2018 21:07:50 GMT -5
Just checked the reed valve and itās good. I start to double/triple check everything and I noticed that there is no spark when I check the spark plug. The spark plug is brand new. Now, correct me if I am wrong but even if I kick start the engine I should get a spark right? I donāt know if this is a related issue but the battery is completely dead. Now, with the battery the scooter ignition was off since the last time we worked on it. In fact, the key has not been even in the ignition. Does anyone have any suggestions?
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Post by ThaiGyro on Jul 5, 2018 21:26:28 GMT -5
Charge the battery...check your charging system for loose or cracked wires. Same with the plug wire. At the risk of sounding dumb, did you ground the plug when you checked it? It won't spark unless you do. Just hold it against the the head (threads or electrode) when you kick it over.
Many old scoots have bad charging systems, but if you cannot start it, it is harder to check. It should be putting up 13-14 volts at 4500-5000 rpm. Check at the battery while running. The battery should hold 12 volts or a bit more..check before starting, then check again when running and you should see more.
If not, your alternator may be bad...or your rectifier/regulator. They are super cheap to buy. Just mount it and plug in. Buy one with the same connector/pin set.
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Post by geoffh on Jul 6, 2018 15:31:25 GMT -5
frankj,now you,ve checked it all and are happy with your work we will move on,if there,s no spark from kicking(ignition on of course)it,s time to replace or test compnents.The most common one is the coil/plug wire combo the wire can break and work intermittently just buy a new one they are quite cheap.The battery condition has no effect on kick start and running of the scoot.
geoff
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Post by frankj on Jul 10, 2018 22:06:42 GMT -5
Geoff, is this the coil/plug wire combo?  |
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...as a mechanical engineer and former oil refinery reliability engineer...I suggest NEVER using heat to remove goo inside. It will work, but takes a long time and causes needless pollution.
