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Just brought a 1999 XP LTD 951, rebuilt by previous owner but never run in and has been sitting for a couple of years.

Ran fine for the first hour, then suddenly it started bogging down between 2500rpm and 4500rpm. It bogs down and tries to die, and starts surging etc (as if not getting enough fuel). Have pulled the carbs apart and cleaned everything and pulled jets out, but now it's even worse and bogs down at all revs, and will die unless the throttle is held wide open (even then it misfires and splutters, and revs won't go past 5000rpm).

Have replaced the fuel hose, and cleaned the three filters (main filter and 2 x carb filter). Seems to be good fuel flow right to the carburetor. Has fresh 95 octane fuel in the tank (only 10L or so). Have low speed mixture set at factory setting of 1.75 turns, and high speed is wound right in (lean, as this was how it was from the start when it used to run ok). Any other settings I may have incorrect?


So gutted as I purchased it for the holiday season but it's not going! Any help would be much appreciated.
 

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When you say "replaced fuel hose" are you saying you replaced all the gray tempo lines? If not start with that and check your compression.
 

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When you say "replaced fuel hose" are you saying you replaced all the gray tempo lines? If not start with that and check your compression.
Yes replaced all the grey tempo lines with aftermarket fuel lines but made no difference. I'll check compression when I'm at home but Im sure its fine.

Could a broken rectifier be causing this? Cheers in advance and merry Xmas!
 
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