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15-04-2008, 07:51pm
Hi John,
The problems with the external fuel pump models (99 - 00) have been talked about since 1999.
Yes, you can clean the injectors, replace the filters, toss out the regulator screen, clean the injector filters, clean the fuel tank strainer, check all the vacuum hoses for kinks and holes and even drain the gear box strainer.
All of these contribute to the fuel starvation problem and surging to various levels.
Even using high octane fuel in hot weather causes vapourisation.
BUT the one thing that reduces the condition more than any is the replacement of the stock fuel lines with proper reinforced fuel injection piping for both the input and return from the tank to the fuel pump.
The OEM lines work well when they are new and when they are installed at the correct orientation, but if they are soft or twisted, they will kink and seal off as soon as the bike gets hot.
The surging condition you describe is exactly what I found happened with the OEM return hose was twisted on the tank sprogett.
It causes back pressure through the fuel pump and then a vacuum when you back off.
I've been there and worked through every one of the suggested causes.
Sorry Raz, the rear wheel cushes being worn don't cause the engine to surge.
The problems with the external fuel pump models (99 - 00) have been talked about since 1999.
Yes, you can clean the injectors, replace the filters, toss out the regulator screen, clean the injector filters, clean the fuel tank strainer, check all the vacuum hoses for kinks and holes and even drain the gear box strainer.
All of these contribute to the fuel starvation problem and surging to various levels.
Even using high octane fuel in hot weather causes vapourisation.
BUT the one thing that reduces the condition more than any is the replacement of the stock fuel lines with proper reinforced fuel injection piping for both the input and return from the tank to the fuel pump.
The OEM lines work well when they are new and when they are installed at the correct orientation, but if they are soft or twisted, they will kink and seal off as soon as the bike gets hot.
The surging condition you describe is exactly what I found happened with the OEM return hose was twisted on the tank sprogett.
It causes back pressure through the fuel pump and then a vacuum when you back off.
I've been there and worked through every one of the suggested causes.
Sorry Raz, the rear wheel cushes being worn don't cause the engine to surge.
"If time catches up with you. You're going too slow!"
Regards BUSGO
Regards BUSGO