WTF! My sons Exciter II SX Burnt a piston!

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daverx1

New member
Joined
Oct 26, 2003
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This is a bad year for the SX's. Sled was running great, carbs were clean and bam toasteda mag side piston! I could use a decent cylinder if any one hase on on the cheap.

Thanks
 
Well the SX is back on the trail, one piston, rings, new main and pilot jets, and gasket set ($160)US. My cylinder was a little messed up but not bad, cleaned it up with some miriadic (SP) acid and 400grit sand paper. After a few break in miles she was pulling 90+ MPH on snow. Plug color is paper bag brown, looks like she might live yet!


Dave RX1

1980 ET 250, 93 Exciter II sx, and my 03 RX1.
 
Thats good to hear.

I also fixed mine with some old 88 cylinders and pistons.

Now, I gotta figure out why it only does 85 MPH on ice on th the gun...?

Cluthes are done, which may account for it.
 
I havent done a compression check, compression "feels good" motor runs clean and pulls hard.
 
If you used cylinders from a 88' exciter they have WAY different porting. The 91'-93' STD. exciters were diff. than the 87'-90'(little better) and the 93'SX was a one off-"special". Your flatslide prob. aren't calibrated perfect for the porting-airflow-I think the stock pipe or y-pipe was different too.(or both??)
 
MSASRX said:
If you used cylinders from a 88' exciter they have WAY different porting. The 91'-93' STD. exciters were diff. than the 87'-90'(little better) and the 93'SX was a one off-"special". Your flatslide prob. aren't calibrated perfect for the porting-airflow-I think the stock pipe or y-pipe was different too.(or both??)
Click to expand...


I have about 10 tanks of gas through it now, and it runs well. I also have a PSI single on it.

It doesn't seem to have lost much power, I may get my cylinders re-done later on, but for now, this works excellent. The sled never really wanted to go over 85 MPH, ever. I know there's something wrong with it, but I can't pinpoint it. The rollers in the primary are done, I have a Polaro primary ready to go on it, to try out, I just need some weights for it.
 
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Thats good -10 tanks of gas is alot...it would have went along time ago if your jetting was way off...Still I remember 'new' that those 93'sx's were pretty fast for the time-faster than 85mph--seems to me they had problems with secondary clutches -bushing wear/binding ?? can't remember exactly.. the motor was a little picky about temp. changes to--piston ported motor-not as forgiving as the reed valve vmax's... call bender racing they still do alot with the older stuff???
 
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