Added reply in a thread 1991 KTM 125mx 87 Motor Project 5/2/2018 1:56 PM

Thanks everybody!

Added reply in a thread 1991 KTM 125mx 87 Motor Project 5/2/2018 12:54 PM

Btw, thanks for the prox link.

Added reply in a thread 1991 KTM 125mx 87 Motor Project 5/2/2018 12:46 PM

Thats what i am thinking they did. I was told it was the pro-x rod. On the receipt for the rebuild it was written down as a 1991KTM. Previous owner must have torn it down and deleivered the crank only in guessing. Its all starting to make sense... The ... more »

Added reply in a thread Happy 40th YZ 125 5/2/2018 3:14 AM

Get a repair manual for your bike. Worth every penny and its what you need if you are not familiar. Cool bike.

Added reply in a thread 1991 KTM 125mx 87 Motor Project 5/1/2018 7:44 AM

I want to open it up, get just the crank fit in the cases and go from there. I was told the previous owner just assembled the whole thing and found out something was not right, after it was put back together...ugh!

Added reply in a thread 1991 KTM 125mx 87 Motor Project 5/1/2018 7:42 AM

Does anybody have crankshaft / connecting rod specs for the 87 engine, i.e. overall length, runout etc...? Thanks for all the help!

Added reply in a thread 1991 KTM 125mx 87 Motor Project 5/1/2018 7:40 AM

Sorry for duplicate post...

Added reply in a thread 1991 KTM 125mx 87 Motor Project 4/30/2018 3:04 AM

Yes its bizarre... Can only imagine why. With how fast the manufacturers were changing designs, i am very suprised they did the 87 engine swap. The frame doesnt look fabbed up for the swap. Must have been an easy thing to do i guess. Gonna be a learning ... more »

Added reply in a thread 1991 KTM 125mx 87 Motor Project 4/29/2018 5:55 PM

Yes its bizarre... Can only imagine why. With how fast the manufacturers were changing designs, i am very suprised they did the 87 engine swap. The frame doesnt look fabbed up for the swap. Must have been an easy thing to do i guess. Gonna be a learning ... more »

Added reply in a thread 1991 KTM 125mx 87 Motor Project 4/29/2018 5:24 PM

The engine is in fact a 1987. The 7 in the engine number gives it. Thanks for your input. I think i should rename this thread...

Added reply in a thread 1991 KTM 125mx 87 Motor Project 4/29/2018 5:15 PM

Looks like its a 1991 frame... M in the vin, upon some research, corresponded to 91.

Added reply in a thread 1991 KTM 125mx 87 Motor Project 4/29/2018 4:01 PM

Perhaps this will shed a little light?

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Added reply in a thread 1991 KTM 125mx 87 Motor Project 4/29/2018 2:34 PM

Gotcha. Thanks for the info. Does anybody know frame and engine numbers? Ill see what i got and post em...

Added reply in a thread 1991 KTM 125mx 87 Motor Project 4/29/2018 2:16 PM

Hmmm... Now its getting interesting!

Added reply in a thread 1991 KTM 125mx 87 Motor Project 4/29/2018 2:02 PM

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Started new thread 1991 KTM 125mx 87 Motor Project 4/29/2018 2:01 PM

Came across this 1992 KTM 125SX. First KTM for me. Looks like a cool bike. Dyno Port pipe, aluminum subframe. Brembo master cylinder. Bottom end was not assembled correctly im told... Its too tight. The bearings, seals and crank was rebuilt, but i was ... more »

This forum thread has 25 replies

Added reply in a thread 1982 RM250 Winter Project 4/29/2018 1:48 PM

Wow, that came out really nice. Great job! Gotta be an awesome bike to ride. Just love the Suzukis from that era...

Added reply in a thread To Build Or Not To Build 4/17/2018 8:11 AM

My 8 year old and i are watching Andy Griffith... Funny, he came across it and i noticed he was in to it. Thank god its not a newer reality show etc... Mr.Furley?

Added reply in a thread 1989 Honda CR125 Compression # 4/17/2018 7:04 AM

Thats a 10/4.

Added reply in a thread 1989 Honda CR125 Compression # 4/17/2018 6:39 AM

Before you tear it back down get the carb straightened out. If that doesnt get you running decent i would suspect the used jug and piston / ring...