My little rubber primer bulb on my Troy-Bilt 4 cycle trimmer split open. I took the carb apart and this bulb comes right out and could be replace very easily. However, Troy-Bilt (is this actually Ryobi?) won't sell just the bulb, they want to sell the entire carburator. Does anyone know if the primer bulb for any other trimmer will fit on the Troy-bilt carb?

Glen, October 2010

I have the same problem with the same trimmer. Did the 188-12-1 work for you and where did you order?

Dave, October 2010

I own on of these trimmers and just had to replace the primer bulb.The Walbro 188-12-1 is a perfect fit and works well.It should run you 3 or 4 bucks at most.
Hope this helps.

Greg, October 2010