smelling123 Posted February 12, 2012 Report Share Posted February 12, 2012 Hi, Does anyone know if there is a difference in the porting between the later 325 and the 340 barrels? Was it simply a bigger bore? many thanks Quote Link to comment Share on other sites More sharing options...
nigel dabster Posted February 13, 2012 Report Share Posted February 13, 2012 The original pistons had holes in them and I think the porting was different but not 100% Quote Link to comment Share on other sites More sharing options...
woody Posted February 13, 2012 Report Share Posted February 13, 2012 Coincidentally, we measured the ports on a Model 159 barrel and a 340 barrel recently and whilst I wouldn't claim it to be accurate to the nearest thou, they seemed to measure up identically. I think you're looking for something you don't need. Any 325 Bultaco has more than enough power. The best way to ensure it is running at it's optimum is make sure the carburettor works correctly (ie: it's not knackered or incorrectly set up, regardless of which type) and that the exhaust is repacked if it needs it. You could remove the baffles from the rear box and make it straight through like the earlier banana type silencer. Make sure the ignition is in good order. Quote Link to comment Share on other sites More sharing options...
smelling123 Posted February 16, 2012 Author Report Share Posted February 16, 2012 Coincidentally, we measured the ports on a Model 159 barrel and a 340 barrel recently and whilst I wouldn't claim it to be accurate to the nearest thou, they seemed to measure up identically. I think you're looking for something you don't need. Any 325 Bultaco has more than enough power. The best way to ensure it is running at it's optimum is make sure the carburettor works correctly (ie: it's not knackered or incorrectly set up, regardless of which type) and that the exhaust is repacked if it needs it. You could remove the baffles from the rear box and make it straight through like the earlier banana type silencer. Make sure the ignition is in good order. You're probably right Woody, easy to ride = less marks lost. Thanks for the advice. Quote Link to comment Share on other sites More sharing options...
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