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So update. Mission accomplished or so I thought. I applied the red silicone and threaded the spark plug specific insert in, the narrowest one since the head wall is so thin. Anyway, the insert still seems loose but when I thread in and tighten the plug, it’s snug. I had also made some adjustments to the carb needles. Tightened them and then backed them out the respective amounts. I got it going OK again but when I try to throttle it up fast, it sounds like the top piston is knocking. So I backed it down. Any thoughts on this? I’ve slowly been adjusting the carb needles but can’t seem to get rid of that knocking. At one point, the connection on the top plug (the one with the stripped hole I had replaced) came undone when I knocked it off. I haven’t put the hoods back on yet. I started it without realizing and it seemed to run fine on one piston before I realized what I had done. Weird. Any suggestions appreciated.
Thanks. Yes. I will likely order that new head for $10 that still looks available with $5 shipping. I had already ordered the new gasket for it and was going to look for a head before I decided to buy the helicoil spark plug rethread kit. I think I drilled the hole at a slight angle and a little of the insert sticks out. I guess I have the spark plug tool and some extra inserts though if I ever want to use it in some other application. But it would have been cheaper too to just go the harder route. One thing I’ve realized with this hobby is … be patient, take your time, do it the right way.
I also think I damaged the low speed needle enough where it affects it running. So, this is when I first started working on the motor and someone said, use the needle to dig the old packing out when cleaning the carb. Well, I bent the tip slightly and gingerly worked it back to “almost perfect” by rolling it over a board with some light pressure. But I think there is a groove in it too from my monkeying with it. I may have a solution for that. I bought this little JW last week for not much and have disassembled most of it to see what I can do with it. The carb concerns me as it appears someone twisted the high speed needle in so hard that a “ring of the carb pulled out with the needle when I finally unstuck it. The low speed needle is great though. So thinking that I should probably take the good needle from that and get a whole new carb (saving what I can from the old one) for the new JW. I see you can buy a used carb for them online for about $30.
That’s IF I feel like it’s worth investing in. The coils looked and tested good but the points and condensers (red paper on top), were nasty. So I pulled everything off the armature plate (and the plate off the motor) and cleaned it like crazy with carb cleaner and a wire brush. It turned over and had decent compression before I started disassembling. The head actually had some water in it because it had been sitting outside from who I bought it from. So I pulled the plugs, sprayed compressed air in and then WD-40 and started moving the pistons by turning the flywheel clockwise. The gas in the tank and carb reeks. It’s almost like paint thinner but the tank inside is clean from what I can see. Need to get to the lower end yet to do some investigative work before I make a decision.
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