Cylinder head No Threads for Spigots?

[ValleyoftheSuns]

bought this bike a while back...but realized the holes where the spigots thread ito have absolutely no thread? at all! like the were smoothed down....anyway you see how they had it set up...

my question: any remedy to make them Still work? or should i be in the market for a new cylinder head...

thanks! BTW its a single carb titled as 1966

[OzBloke]

Valley,

To me, that looks like a 76 or so Tiger head (which came with push in pipes). I'm thinking someone's done an upsize to a 750.....

[ValleyoftheSuns]

any suggestions? seem okay for now.....but down the road i'd like to maybe change the pipes ...

[1759AG]

One of mine were like that, smoothed up some JB weld; slid the stem down in and seems to be okay. Not the most desireable, but works until it can be replaced.

[OzBloke]

Valley,
You can buy the stubs (70-9516 ) from another model, and get the exhaust ports threaded, and fit push-over pipes and clamps.

[htown16]

From the shape of the rocker covers that is definitely a 750 head and as mentioned the pipes slide straight in. That also looks like a 70's front fork. Does the bike have a disc brake?

[ValleyoftheSuns]

front and read drum brakes...

it is titled as a 66'...but i think it's a bit of a frankenstein.

the vin numbers stamped on the motor read:

TRI V
D.C. 15622

any clue what that indicates?

i can't seem to find #'s on the frame....where are they?...maybe painted over..

[ValleyoftheSuns]

are these the spigots i need?

http://cgi.ebay.com/ebaymotors/Trium...spagenameZWDVW

seem like what i need anyway....i see you can eith er weld them or stake them in with a screw set...what does that mean?

any help would be great

thanks

[Sunshine Jim]

eya Valley,

"staking" is an old brit term like "spanner".

that means sliding the part into the hole and peening the metal at the edge slightly to clamp it securely.

i usually make 3 or four punches around the port. if it's worn slightly loose i have a dood trick for tightening then up. it's called hand swaging. an old blacksmith term.

use am old long bolt with the threads cut off for your swage. you're using it almost like a punch but you want to shape the end to a snooth, slightly rounded on the edges punch that you can use to tap the edges of the hole tighter with the exhaust adapter in the hole.

give it a little angle so you can work around the stuff in the way.

check the size of the adapter, if its the right size you're in luck.

actually that looks like it is a "reducer'" type of adapter. you can just find or make a piece of straight tubing that won't constrict your port flow so much.

this would be a good time to find out what internal diameters are available in triumph pipes. an exhust shop can open them up slightly if they're a little small.

they can also make your adapters for you . fit em to the pipes before you stake em and trim them so your pipes fit flush.

i think you might want to mark your pipes for flush to the head with masking tape so you can trim em perfectly before you remove them.

go for it, and good luck. this is what rodding is all about.

[Lutz]

Valleyofthesuns,
Because of the shape of the rocker covers I believe your engine is
a late 650cc engine not definitely a 750 cc.The 750 has 6 bolt covers
the 4 bolt covers.
Lutz