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Discussion Starter · #1 ·
I have a early forty's flathead 45 engine and found a frame that I think is for a big twin. I was wondering if my 45 would fit without too much trouble. The only number's I can find are on front mtr. mount , they are ex631 . Any idea what year and what motor it's for. Does it look worth buying, or is it too hacked up?
Thanks
 

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I have a early forty's flathead 45 engine and found a frame that I think is for a big twin. I was wondering if my 45 would fit without too much trouble. The only number's I can find are on front mtr. mount , they are ex631 . Any idea what year and what motor it's for. Does it look worth buying, or is it too hacked up?
Thanks
Nuther pre 48 knuck/big twin flathead frame. I don't think I've ever seen one with a 45 in it, but it's probably been done (everything has already been done when it comes to old scooters).
Larry T
 

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That's definitely a Knuck/UL pre-1948 Big Twin frame. Not badly butchered, from the looks of it (what's the thing under the neck? And the sidecar loops, lower front, and the speedo/upper tank mount were hacked off, "chopper daze" style). The Knuckle frame would run $3,500 by itself in decent shape.
You don't want to put a 45 engine in a Big Twin frame/chassis. It would be the most under-powered little minibike seen in decades. 45 solo frames were made until 1952. their front is the same as a Servi-Car frame: a single "s"-curved front downtube, iron forging under the engine. Two varieties of them: 3-bolt trans (1940-later) and 2-bolt trans (different, hard to find 3-speed box) 1937-39. Before 37, the 45 was a constant-loss "RL." a companion to the constant-loss VL 74 model.

If you're gonna build a 45, find a 45 frame. Any WLA frame will also fit. That Knuckle frame is also good trading material. More people are looking for Big Twin frames than for 45s.
 

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Discussion Starter · #6 ·
Thanks for the advice, I thought the 45 had a single downtube and was unsure if the front exaust would clear on this frame, but the guy said it would work. The price is not too bad and it is close by, so maybe I'll pick it up to trade on.
clyco 303
 

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Discussion Starter · #7 ·
One more question about this frame. The steering head looks to have some different bearing races installed, can these be taken out and returned to stock configuration or have to go with these? I know nothing about old Harley's so they may be factory, so correct me if I'm wrong.
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clyco303
 

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You can knock those bearing cups out and put in stock cups -Ball bearing,Or any 1 inch cups.
 
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