Does anyone know what jets are in the grubee 60cc kits from factory? or what jets work well at 4500ft elevation?
Jetting?
- Thread starter bronco315
- Start date
usually around 0.28" or 7mm factory, but im not sure about 4500ft up id think smaller.Does anyone know what jets are in the grubee 60cc kits from factory? or what jets work well at 4500ft elevation?
my jets appeared to be about a #65 bit i soldered em up and took them down to a#80 and what a difference it made, my house sits at 7108 ft
Alright I'm a bit confused on the drill bit vs jet size vs hole diameter. I have read that stock jet is approximately #70 which is approximately 0.7mm= 0.028mm right? I also read that leaning it out makes it a bit smoother and might help my 4 stroking. So if i want to close the hole then I should use a smaller jet- perhaps a 65. So as jet size increases, the hole size increases? I take it this is the opposite since as drill sizes increase the hole is smaller (ex #70 is smaller than #65).
Appreciate the clarification as I am just confused.
Appreciate the clarification as I am just confused.
ya higher the bit number the smaller the hole i bought my really tiny bits at hobby lobby by going to the #80 i totally got rid of the top end 4 stroking and increased response an acceleration all thru the band. you can google bit size versus bit number and you will find a chart
Yes jet size is jet size, a 65 jet is smaller than a 70 jet. But they do correspond to mm. A 65 jet is a .65mm jet and a 70 jet is .70mm.
Here is drill chart for reference.
Here is drill chart for reference.
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I guess its mostly trial and error. but at 3-4 bucks a piece its nice to have a jumping off point. I read another thread that said he went down to a #65 jet at 1200 and could have gone one more down so i guess im starting at #62. We will see, thanks for the help, I'll let you know how I make out. I also ordered a Dellorto carb 14-14. Any experiences with these?
where did you find the 14/14 carb i went to dellorto direct.com and didnt see it they had listings like pbgh pble and im guessing here but im close they came in lotsa sizes 15 to say 38 mm what am i looking for? have a model number?
