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Google "digital switch low voltage when off" and read the AI generated answer. Digital switches doesn't go all the way to zero or all the way up to supply voltage. They just get close enough to both to cause things to operate correctly. I wrote functional tests for commercial airplanes. When we...

Read about annealing copper washers. I have reused many as is and annealed and both worked. I now anneal them all just for peace of mind.

Same 97 GTI here that we bought for $1. It had never been touched and wasn't running due to clogged filter inside carb. Rebuilt the carb and ran it for part of a year. Read the carb rebuild thread many times and I think I followed all the instructions. It had a similar lean bog off idle. No...

Common advice from experts and manufactures is never poke anything though jets or small carburetor passages. There are those cavemen out there so I understand their perspective so never let it be said I suggested it. Aluminum oxide is what I think the white stuff was. It is actually harder and...

Get a piece of wire from a wire brush and see if you can poke it down those holes. There are also micro or jewelers drill bit sets that are cheap and you can sacrifice some to find one that will fit in the holes. Use a piece of old inner tube with a hole punched in it to form a gasket around the...

I got fancy for my first pressure test. Plywood traced from the gaskets and some old motorcycle inner tube to seal. My bycycle pump has a gauge so I used that on the pulse line. My old engine wouldn't hold any pressure for more than 15 seconds however it wasn't a bad oil leaker. I have since...

Just visually looking at a seal will tell you almost nothing. I would do a pressure test. Air is a smaller molecule than oil. If you have an air leak it doesn't mean a big oil leak. But if you have a big oil leak from a seal, then you will also have a huge air leak.

Google "viscosity relation to piping losses" and read the AI answer. Air isn't very viscous. I do the same sorts of garage experiments and I am very impressed with yours. It's been 47 years since I graduated from college and all those classes are a distant memory. Now all I know are the basics...

Resleeved and .25 over? That's an oxymoron. I got a 1997 720 that had never been apart and had sat for 7 years after it wouldn't start. I got it running and we ran the crap out of it for a summer. First picture is the cylinder wall condition after that year. You can see the factory chamfers on...

Less than $250 for a usable pump from Westside and a new OEM wear ring to me is a lot better than some glue and hope you don't sink.

Advice you are getting here is pretty much what the maintenance manual says in the troubleshooting section with some added solid advice not in the manual. Spark or fuel is the issue. Spark timing is direct off the crank, not the rotary valve. I highly doubt you have a timing issue. Seems like a...

I wasn't trying to beat a dead horse. Wrote my second post, got distracted with something else, and didn't hit post reply until hours later. In the meantime, mikidymac had written a very insightful explanation.

Maybe I should explain it with math. Spring rate is units of force per unit of deflection expressed as ponds per inch or newtons per millimeter or kilograms per millimeter. The load at any deflection is the free length minus the length when deflected times the spring rate. I worked in the...

Think about diving boards. Long board will sink a several feet from the base when you stand on the end. It feels soft under foot. So you adjust the board up with an initial arch so you only sink a foot from the base. This is adjusting the preload. However it will still stay soft under foot. This...

mikidymac is correct about springs. There are two basic things about springs regular people should understand, preload and spring rate. If you don't understand, read about it a little. Adding a washer or bending the arm or bending the spring (shudder) are changing the preload. Wire diameter...

Very strange that the impeller loosened. The driveshaft rotation is in the tightening direction. At this point pull out the shaft and carefully inspect it and the thrust bearing and thrust washer. Shop manual shows you what to look for. Any imperfections will just get worse so things need to...

I put a thin layer of high temp RTV on it for the water jackets and it is working fine. I bet yours will be OK.

Pump or engine. Rock in the pump?

One word for working on all old Japanese carburetors, Vessel Megadora Impacta #980 P2-100. American carburetors too.

This thread answer it?