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Engine basics => Engine set up tips => Topic started by: Gerald Arana on October 24, 2016, 07:23:23 PM

Title: What Jett is this?
Post by: Gerald Arana on October 24, 2016, 07:23:23 PM

I picked up this Jett___ engine Missing a carb and I'm wondering what size engine it is.

From the bottom of the mounting lugs to the top of the head is 2.55-2.60 The bore is just shy of .0900  Wt. is somewhere around 12-12.5 oz's I guessing since It doesn't have a carb.

I tried to measure the stroke but the pinch was to much and kept pushing the sleeve up.

Anybody got any ideas?

I'm thinking about sending it to Dub, but I'll call him before I do.

Thank you, Jerry


PS: Minor detail: It has "Doyle 1" etched on the bottom.

Title: Re: What Jett is this?
Post by: Ken Burdick on October 24, 2016, 07:57:48 PM

sounds like a .40 from the bore but send Dubb a picture

Title: Re: What Jett is this?
Post by: Reptoid on October 26, 2016, 03:17:17 PM

Quote from: Gerald Arana on October 24, 2016, 07:23:23 PM

I picked up this Jett___ engine Missing a carb and I'm wondering what size engine it is.

From the bottom of the mounting lugs to the top of the head is 2.55-2.60 The bore is just shy of .0900  Wt. is somewhere around 12-12.5 oz's I guessing since It doesn't have a carb.

I tried to measure the stroke but the pinch was to much and kept pushing the sleeve up.

Anybody got any ideas?

I'm thinking about sending it to Dub, but I'll call him before I do.


Thank you, Jerry


PS: Minor detail: It has "Doyle 1" etched on the bottom.

You will want to check with Dub or put a degree wheel on it. Dub makes a lot of different engines and the timing varies a lot from stunt to sport R/C to pylon. If you put a washer or spacer on a head screw and gently secure it to hold the liner down with the head off you can check the port timing, stroke, and deck clearance. :)

Title: Re: What Jett is this?
Post by: Gerald Arana on October 29, 2016, 01:58:59 PM

Hi Don,

Thank you for that info. Didn't think about locking the sleeve down! Good idea, but I've decided to send it to Dub (after emailing him) and see what it really was made for.

I have to tell him exactly what I want to do and I'll get 'round to it one of these days.

Cheers, Jerry

Title: Re: What Jett is this?
Post by: Motorman on October 29, 2016, 09:47:59 PM

If that's an aluminum sleeve, I wouldn't screw washers down to hold the sleeve. Just put the head on then turn it to TDC then take the head off and measure. Or, you can measure stroke off the crank pin.

MM