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Author Topic: Is there anyway I could tell the difference on what year of the engine I have?  (Read 1223 times)

Offline Nearman Creek

Is there anyway I could tell the difference on what year of the engine I have? I don’t know if I have a 86 (short rod stroke) or a 87, 88, or an 89 motor. If I can’t tell the difference what’s the easiest way to figure out if I need a spacer plate or not?

Offline croat1

Is the engine still assembled and in the quad?

Joe

Offline evaneyeball

If the cylinder is off one easy way to tell is that the year its made is stamped on one of the cylinder skirts on the bottom if not then the serial number on the left side near the front sprocket and shifter changes from year to year I believe I'm not sure of what the changes are though
LED built 86 trx 350 CEO
81 ATC250r
Zero finesse and alot of throttle

Offline dp250r

Short rod cylinder doesn't have a bridged intake first pic. 87 -89 long rod has bridged intake second pic.

Offline atvmxr

only if its never been taken apart.  With a motor ~35 years old it could have any combination of cylinder, cases, crank, and transmission in it by now.  You need a spacer plate when using the 87+ crank (long rod) and the 85-86 piston, regardless of which style cylinder you have.  And then there are several set ups with aftermarket cranks/cylinders that may or may not require a spacer plate
Bunch of race quads that run on premix

 

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