Suzuki 2 Strokes

I picked up a 1974 GT 550 from Craigslist. Similar to one I had in the '80s. Not running but it turns over and has good compression.



Expansion chambers from Craigs list also. Made the seat from glued foam board.

Here's what I have so far.


To be continued......

Nice project , i wonder what brand chambers those are ? They are the shortest 550 pipes i have ever seen .

Modesett Engineering in Yorba Linda. No longer in business.

Definitely not a 74. At least the motor is not. The motor is a 72-73. Even at that the cylinder head looks all wrong for a 550. Help me out guys! What's all wrong here? And the fork gaiters indicate an earlier model as well.

The top picture looks like it's all 73 (K) to me, apart from the chrome headlamp ears. Maybe it was first titled in 74 and that's where the confusion comes from.

The second picture was a 74 tank and side covers but retains early style carbs and head cover.

BTW, anyone know the master cylinder size on a 550 with stock single disk?

14mm. That info and service limits is in my sticky 'General specs and info'. 380 and 550 shared the same one. 750 is larger

The tank is off a 74. This one has the frame stamped as 7/74. The chambers are shorter but the silencers are incorporated directly onto the stinger. I understand that these chambers have the stinger inserted into the rearmost cone several inches.
As I understand design, the rearmost cone reflects back the pressure pulse toward the cylinder, the shorter the cone the quicker the travel time, thus operating at a higher RPM

It doesn't run yet so I don't know.

Top pic, colours are 73 K except for chrome ears, headlamp and clocks.
Early engine with late 72/early 73 high top carbs.
2nd pic late tank and panels (Candy Rose GT550A?) with one pod filter fitted (which will cause weak running especially with a 3-1 spannie) and lots of bits missing!!
Fork gaiters on the J were 13 serrations, K were 8, after that no gaiters.

Just enjoy what you have and if it runs OK, then it's fine.

Stevesturdevant wrote: these chambers have the stinger inserted into the rearmost cone several inches.

Ah .. that explains the length .. internal stingers