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Old 06-29-2020, 08:03 PM
e30 gangsta e30 gangsta is offline
Join Date: Mar 2016
Location: Savannah, GA
Posts: 72
Building one engine out of two.

Alright guys quick question.

I have a blown motor xs with a 3J6-000101 1980 engine In it.

I bought a spare 1981 4R0-000101 running engine for it.

The problem is the 4R0 engine did not come with a timing Advance unit.

Can I install the 4R0 engine into the 3J6 frame and use the 3J6 tci and timing Advance unit on the 4R0 engine?

Any help would be greatly appreciated. Thank you!
80 XS1110 SG, RD400
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Old 06-30-2020, 03:48 AM
red bandit's Avatar
red bandit red bandit is offline
XSive Maximus
Join Date: May 2005
Location: central michigan
Posts: 824
Yes you can.
79 F full cruiser, stainless brake lines, spade fuses, Accel coils, modded air box w/larger velocity stacks, 750 FD.
79 SF parts bike.
guns, beer and bikes
what more could you ask for.
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Old 06-30-2020, 06:33 AM
skids's Avatar
skids skids is offline
XS-XJ Super Guru
Join Date: Jul 2002
Location: Florissant, CO, USA
Posts: 4,950
I agree. Keep the older model black box and older coils as well.
Skids (Sid Hansen)

Down to one 1978 E. Stock air box with K&N filter, 81H pipes and carbs, 8500 feet elevation.
03 Honda ST1300 ABS
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