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by nevhunter
Sun Aug 19, 2018 9:49 am
Forum: Four stroke
Topic: Metal in oil filter
Replies: 1
Views: 68

Re: Metal in oil filter

Check what they are with a magnet, If they are hard steel flakes your big end is probably failing. Pull the plate off the bottom of the crankcase and check the screen there. They can cause the scavenge pump to fail as the ball valve won't seat with chips there. Had it happen. The engine ends up smok...
by nevhunter
Sun Aug 19, 2018 3:21 am
Forum: Main Chat Forum
Topic: Whitworth vs BSC Thread question
Replies: 6
Views: 104

Re: Whitworth vs BSC Thread question

BRASS is 26 tpi also but a different angle (5 degrees different). If you are serious get it right and look after the original threads in your frame as oversize or changed threads are not easy to rectify. Don't just run a tap through them as it may be a bit oversize and plug the threads with wood bef...
by nevhunter
Sat Aug 18, 2018 11:30 pm
Forum: Four stroke
Topic: kh engine rattle
Replies: 18
Views: 337

Re: kh engine rattle

The fuel cap can rattle too but I expect you all knew that. Nev
by nevhunter
Sat Aug 18, 2018 11:24 pm
Forum: Main Chat Forum
Topic: Using solder instaed of filler
Replies: 11
Views: 295

Re: Using solder instaed of filler

Steel is not easy to tin and some of the flux is left in parts covered up. Unless you get prefect tinning . like with copper , brass nickel etc No amount of scrubbing will get at the stuff underneath . Nev
by nevhunter
Sat Aug 18, 2018 11:19 pm
Forum: Electrics
Topic: Magdyno aaahh!
Replies: 10
Views: 222

Re: Magdyno aaahh!

Paul the one size does most magnetos. When you get into generators it's a lot more variable. You could probably adapt a Jacob''s chuck. The type with a removable arbour and weld a nut there for the extractor bolt. Must get around to doing that. Nev
by nevhunter
Sat Aug 18, 2018 11:13 pm
Forum: Main Chat Forum
Topic: Whitworth vs BSC Thread question
Replies: 6
Views: 104

Re: Whitworth vs BSC Thread question

British cycle is 26 tpi and in some cases as axles etc is 20 and is of whitworth form. thread section. Yours appears to be 26 but worn. Acme stainless would be worth a try. Nev
by nevhunter
Sat Aug 18, 2018 3:05 am
Forum: W/NG Technical
Topic: Drain plug primary drive case
Replies: 3
Views: 57

Re: Drain plug primary drive case

Checked two I have here. Both are rough cast and genuine therefore. No sign of the relief or the "DRAIN" stamp. That doesn't mean it's not genuine in your case . Nev
by nevhunter
Sat Aug 18, 2018 12:35 am
Forum: W/NG Technical
Topic: Primary drive sprockets
Replies: 10
Views: 127

Re: Primary drive sprockets

I forgot to say always finish with the tensioner bolt/ nut assembly forcing the gearbox forward and have the main securing stud and bottom bolt tight. Nev
by nevhunter
Sat Aug 18, 2018 12:02 am
Forum: Four stroke
Topic: kh engine rattle
Replies: 18
Views: 337

Re: kh engine rattle

Yes and Yes Ivor. so can small ends there's various tricks used to isolate some of these noises. Piston noises vary with engine temp and load as well as oil viscosity. It's not unusual to get a bit just after starting but that should reduce and disappear as the motor gets hotter . The cam followers ...
by nevhunter
Fri Aug 17, 2018 11:46 pm
Forum: W/NG Technical
Topic: Primary drive sprockets
Replies: 10
Views: 127

Re: Primary drive sprockets

As far as the weakness is concerned both links have the same issue The non flat (offset) side plates, which is extremely poor design from an engineering standpoint. I'm not racing my stuff, so IF it cannot be avoided I do use them but not necessarily too happy about it. Split rollers are even worse ...

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