• Husqvarna Motorcycles Made In Sweden - About 1988 and older

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390 pipe on a 250

disonny

disonny

Husqvarna
AA Class
I have a 78 cr250 and I have a cr390 parts bike. The pipes are made differently but the mounting looks the same. I wonder what the power would be like with a 390 pipe on my 250? I would give it a try but I took the top end off for a bore and new piston.
 
Interesting to find out Im sure some one has done it before. I do know pipes are designed to obtain the most power per cc (engine size). So even tho it might fit, you may not be getting the most potential power for that specific engine. I am doing my 79 250 right now also , what piston and size are you going with?
 
I just pulled it apart the other night. The piston is a 69.43mm. It's very loose in the bore. I haven't done much research for pistons. What would you recommend? From what I've read it could be an original size piston. I also found out the engine is actually a 76 cr250 in a 78 frame. I realize pipes are made for optimum performance for a specific engine. Thats why I asked if anyone had tried such a thing.
 
put the piston inside your cyl. and check the clearances with a feeler gauge and write it down check in all positions also. Who ever does your motor work (boreing) will do this too. I just checked with huskydogg.com (steve) and he said he has all sizes for the 250, wossener piston kits. If you can go up one bore the next one is 69.45 if not then 69.46 should work for you. I think Halls have them too. My piston was 60 over, cyl. is 71mm so I am getting another cyl. and starting over at 69.94 then I can even resleeve my original or have it plated and be good to go for a long time. good luck...
 
For reference i have tried gobs of pipes on my WB165 (husky 125 with Wallybeans 165cc kit). Everything from 125 domas to 200 FMF KTM to KX125 pipes. All move the power around and surprisingly all make good power and run fine just put the power in different places. Short fat pipes seem to make good bottom and no top. Medium length cone pipes seem to make good mid. Longer cone / short stinger pipes seem to loose some bottom but make top. I have tried so many pipes on this bike for the fun of it that I can almost look at the 2 stroke pipe and tell you what type of power to expect. If i had to guess I bet the 390 pipe makes more bottom and less top.
 
The pipe from the cr390 looks like it's fatter farther back than the pipe that was on the 250. The stinger is pretty long on the 250 pipe too. I'm not sure what pipe the 250 has. I don't know what was stock on them.
84scrambler, The piston is pretty loose. Probably the loosest I've seen. It rattled pretty bad when I started it. I'll measure it tonight. Just by eye it looked like 10 or 15 thou.
 
I put a 390wr pipe on my 77cr motor and it runs great i got the motor on ebay so i don't know how it ran originally i've always run big bores but that 250 runs strong low end all the way to the top i was impressed.I had to weld a extra mount for support but that was no big deal.It works fine for me.IMG_0062.JPGIMG_0080.JPGIMG_0061.JPGIMG_0100.JPG
 
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