Jockey Journal Forum banner

1 - 5 of 5 Posts

·
Registered
Joined
·
332 Posts
Discussion Starter #1
I searched on here and google and found about 76,000 answers on what the exact thread count, size, and pitch is for a '63-'70 Triumph 650 sludge trap. Mine is kind of boogered up and am looking to order a tap set to redo it. I talked to a local Triumph guy, he basically told me I'll definitely have to order it from England. If I can't get this guy retapped I'ma have to find a new crank, any help?
 

·
Registered
Joined
·
73 Posts
I got a new hex socket plug for mine and it didn't fit. I figured my threads were messed up until the old one went in like a boss. Turns out the new plug threads weren't deep enough and it would bind right away. I smeared valve lapping compound on there and did the back and forth thing for about two beer. After that and a good cleaning, it's right where it should be. Maybe that could work for you too...
 

·
Registered
Joined
·
498 Posts
The plug is 7/8" diameter on a 650 and 20 tpi.It will be a 60 degree thread,but I think it's BSC (cycle-thread),not a Unified thread ;although there's not a big difference.

7/8"x 20 tpi UNEF (Unified extra-fine aircraft thread) would be close enough.
 

·
Registered
Joined
·
3 Posts
check this place

Reiff & Nestor Company

Quality Taps Since 1912



7/8-20 Tap

Tap Size:
PD/H Limit:
Flutes:
Chamfer:
Series Designation:


EDP No.:


How do I buy R&N Taps?

 

·
Registered
Joined
·
90 Posts
The plug is 7/8" diameter on a 650 and 20 tpi.It will be a 60 degree thread,but I think it's BSC (cycle-thread),not a Unified thread ;although there's not a big difference.

7/8"x 20 tpi UNEF (Unified extra-fine aircraft thread) would be close enough.
I boogered up the threads in my crank with a new hex plug. I ordered a 7/8 NEF tap from mcmaster-carr and it worked like a charm to clean the threads up.
 
1 - 5 of 5 Posts
Top