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Penton Owners Group

General Discussion => Penton Talk => Topic started by: Steve Minor on June 17, 2013, 03:57:06 PM

Title: motor swap question
Post by: Steve Minor on June 17, 2013, 03:57:06 PM
I have a question.....I'm putting a 1976 125 motor into a 1977 125 frame and have a 1/2" gap at the left rear mount. The right side rear has a bolt on spacer on the cases (which I expected) and I'm wondering if there is some sort of spacer needed on the left side rear. The down tubes at the rear mount area measure 8-1/2" inside and the motor mounting surfaces measure 8", leaving me 1/2" I need to fill. Any ideas? I suppose I can fab up a spacer if I need to.


Steve Minor
Wilmington, NC
Title: motor swap question
Post by: 454MRW on June 17, 2013, 06:19:15 PM
It sounds like you are missing the large nut that screws into the LH rear case, and is often stripped out. A little JB Weld and screwing in a new or good used nut goes a long way toward taking care of the problem other that what a good Magnesium welder can do. Mike

(http://i232.photobucket.com/albums/ee220/454MRW/1978GS-6PentonKTMEngineLH-2_zps8ce54daf.jpg) (http://s232.photobucket.com/user/454MRW/media/1978GS-6PentonKTMEngineLH-2_zps8ce54daf.jpg.html)

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1980 KTM 175-400'S
1975 Can Am 175 TNT & 77 250 Black Widow
1979 Husqvarna OR390
1976-78 RM & 77-79 PE Suzuki's
1974 CR250M 07 CR125R 79 CR250R
Title: motor swap question
Post by: Steve Minor on June 17, 2013, 10:07:38 PM
I must be missing that nut.......
Are you telling me the nut is hollow and the motor mount bolt passes through it? Any idea where I can find one?

Steve Minor
Wilmington, NC
Title: motor swap question
Post by: 454MRW on June 18, 2013, 03:48:15 AM
Yes, and protrudes into the case. Gary Ellis might have s a spare. Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1980 KTM 175-400'S
1975 Can Am 175 TNT & 77 250 Black Widow
1979 Husqvarna OR390
1976-78 RM & 77-79 PE Suzuki's
1974 CR250M 07 CR125R 79 CR250R
Title: motor swap question
Post by: Steve Minor on June 18, 2013, 07:21:18 AM
Mike, you wouldn't happen to have a part description, part # and photo from a manual would you? I'm trying to chase down this part and I want to seem at least semi intelligent....ya know?

Thanks

Steve Minor
Wilmington, NC
Title: motor swap question
Post by: 454MRW on June 18, 2013, 07:44:32 AM
The part is referenced in the engine manuals as an engine mount bushing, part # 52.30.010.100 and interchangeable part # 51.30.010.100 and is the same for all KTM 125-175-250-400 engines, probably from 1973-early 1980. Anyone who rebuilds KTM engines may have spares from engine cases that are rotted out from moisture and corrosion, or damaged. I ususally give all of my spare engine cases to Gary. Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1980 KTM 175-400'S
1975 Can Am 175 TNT & 77 250 Black Widow
1979 Husqvarna OR390
1976-78 RM & 77-79 PE Suzuki's
1974 CR250M 07 CR125R 79 CR250R
Title: motor swap question
Post by: Steve Minor on June 18, 2013, 08:31:08 AM
Mike, that's a tremendous help...thanks!
I'll start looking for one.

Steve Minor
Wilmington, NC
Title: motor swap question
Post by: ALB on June 25, 2013, 09:11:53 AM
I have these n.o.s. bushings in stock under the 52-30-010-100 part number.



Alan Buehner
Title: motor swap question
Post by: Steve Minor on June 25, 2013, 06:44:18 PM
Thanks Al but I have a used one coming from Gary Ellis.

I have some Bing carb "issues" I need to sort out so I may be calling you soon.

Steve Minor
Wilmington, NC
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