31-10-22, 09:24 PM
Likesbikes: You are well ahead of my post then. I presume the TPS was a new non-Yamaha or Mikuni Part? The Yamaha Price is off the wall compared to Suzuki for exactly the same Mikuni part.
Used ones are hit and miss and not good value unless very cheap. They are carbon track Rheostats and the tracks wear over time. The TPS tells the Ignitor what the throttle open it at and them compares it to the engine revs and bike speed and will adjust the timing accordingly when the tracks wears the resistance changes and the ignitor changes the timing to suit what it sees and that causes the surging and uneven idle.
Forgot to add, to remove the cam cover remove the bolt holding on the thermostat housing it only needs to be able to move a very small amount to get the cam cover off, usually out the right side. Highly unlikely the valve clearances were checked is there is no history with it. Unfortunately because there is no noise from a tight valve clearance many assume wrongly all is ok.
I have an Ultra sonic cleaner and if you use a detergent to clean the carbs make sure you blow the jets and orifices dry when the carbs come out of the cleaner. I no longer buy after market kits for carbs as many are supplied with O rings that are not really Ethanol resistant and or low quality. I now buy directly from O Ring suppliers. This company are good to deal with https://www.polymax.co.uk/o-rings/rubber-viton-oring/ and have FKM(Viton) 80 ShA O Rings.
The sizes are: Float needle valve: 7.5mm ID x 1.5mm cross section 10.5 OD
Main Jet: 5.5mm ID x 1.5mm cross section x 8.5mm OD
Float Bowl sealsare:YAMAHA 5DM-14561-00-00
SUZUKI 13258-04F00
Both are exactly the same and like the TPS are Mikuni items in a Yamaha or Suzuki package and last time I bought some the Suzuki one were over half the price as was the last TPS I bought.
Bike benefits from a free flowing filter (I use K&N) as it was ran slightly rich from the factory to pass the noise limits.
Used ones are hit and miss and not good value unless very cheap. They are carbon track Rheostats and the tracks wear over time. The TPS tells the Ignitor what the throttle open it at and them compares it to the engine revs and bike speed and will adjust the timing accordingly when the tracks wears the resistance changes and the ignitor changes the timing to suit what it sees and that causes the surging and uneven idle.
Forgot to add, to remove the cam cover remove the bolt holding on the thermostat housing it only needs to be able to move a very small amount to get the cam cover off, usually out the right side. Highly unlikely the valve clearances were checked is there is no history with it. Unfortunately because there is no noise from a tight valve clearance many assume wrongly all is ok.
I have an Ultra sonic cleaner and if you use a detergent to clean the carbs make sure you blow the jets and orifices dry when the carbs come out of the cleaner. I no longer buy after market kits for carbs as many are supplied with O rings that are not really Ethanol resistant and or low quality. I now buy directly from O Ring suppliers. This company are good to deal with https://www.polymax.co.uk/o-rings/rubber-viton-oring/ and have FKM(Viton) 80 ShA O Rings.
The sizes are: Float needle valve: 7.5mm ID x 1.5mm cross section 10.5 OD
Main Jet: 5.5mm ID x 1.5mm cross section x 8.5mm OD
Float Bowl sealsare:YAMAHA 5DM-14561-00-00
SUZUKI 13258-04F00
Both are exactly the same and like the TPS are Mikuni items in a Yamaha or Suzuki package and last time I bought some the Suzuki one were over half the price as was the last TPS I bought.
Bike benefits from a free flowing filter (I use K&N) as it was ran slightly rich from the factory to pass the noise limits.