The motors can be made to fit by sawing off the bottom rear mount, which is cast into the XT and TT engines. I am building a TT 350 powered SRX 250, and will have to design and fabricate a front engine mount, too.
The swingarm mounting shaft on the XT and TT engines goes through the frame, and makes for a rigid tight mounting while keeping a shorter wheelbase. An SRX 250 engine is not dimensionally identical, although it does share many components.
My idea was to drop some weight off the already light SRX 250 by getting rid of the big battery, electric starter and solenoid,giganto airbox, and adding some power, too. I'll drop some weight getting rid of the Starship enterprise wiring harness, too. Muscle and bone two lane scalpel is my idea, and a l;ittle sculpted beauty to boot.
I have mocked up some ninja 250 mikuni flatslides to the TT 350 engine, and thet do fit rather nicely. The right half of a Kawasaki 650 four exhaust system modified pretty well for better breathing, too. Got rid of the thousand pound (maybe a little less) choking resonator, too. I think my total weight shaving might amount to 20 pounds or more, with about 15 to 18 extra horses. The performance enhancement should be favorable for more fun and laughs.
White frame, red bodywork is the visual plan so far, and I shot the red last night. Simple white tuning fork logo on the tank, with SRX/TT 350 lettered on the top fairing ought to do it. I should have it done this Summer, and will post a picture of it then.
I was keeping the project a secret, but spoke up here to warn someone who might think it is a simple power swap and upgrade. It's not, although it is certainly possible. The SRX 250 is a great handling bike that is light and great fun to ride on tight two lane curvy roads and beats up much bigger bikes due to the fact that you don't have to slow down much and horse it around corners. With the loss of some weight and the addition of some power it should be a phenomenal little giant killer, sort of a little thumper RD with better handling and torque. More with less, and a unique unit. That's what I was thinking. So far so good.