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8720 LEGO Technic 9V Motor Set thumbnail image

8720 LEGO Technic 9V Motor Set
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8720 LEGO Technic 9V Motor Set
  • 9V Motor Set thumbnail
  • 9V Motor Set thumbnail
  • 9V Motor Set thumbnail
  • 9V Motor Set thumbnail

LEGO 8720 9V Motor Set is a vintage Technic set from 1990 valued at $75 for new and sealed sets, up 109% from an original retail price of $35.99. Annual appreciation has averaged 2.54% since release. On the used market, values range from $43 to $54 based on condition. Secondary market prices for new and sealed sets typically fall between $66 and $80. Market momentum for the set is steady for now, with growth that keeps pace with similar sets.

9V Motor Set Value (New/Sealed)

This chart represents the current new/sealed value of the set 9V Motor Set since December 2016. Very high accuracy
LEGO 8720 9V Motor Set is a Technic Supplementary set released in 1990, containing 57 pieces. It includes a 9V motor, battery box, electrical cables and plates, rubber belts, and various Technic elements intended to add power to TECHNIC models. As an add-on for the Technic 9V system, it enables motorized functions and simple mechanisms in compatible builds.

A new and sealed 9V Motor Set is currently valued at around $75, with annual growth of 1.7% that is expected to level off to around 1.3% in the coming year. The average used price is $45 for those in good overall condition. New and sealed listings currently range from $71 to $80. Recent market trends show a period of price correction, with values declining over the past year.
All regions

For Sale (New/Sealed)

 (US) NEW Vintage Sealed 1991 Box - Lego Technic Power Pack # 8720
BrickEconomy Choice
$72.00
(NL) 9V Motor Set from BrickLink seller Kraampje43 $58.73
-22.0%
(US) 9V Motor Set from BrickLink seller BrickHeads $59.95
-20.4%
(US) 9V Motor Set from BrickLink seller BxB $60.00
-20.3%
(CA) 9V Motor Set from BrickLink seller legosam $66.33
-11.9%
(BE) 9V Motor Set from BrickLink seller all.inn.bricks $73.51
-2.4%
(US) NEW LEGO TECHNIC # 8720 MOTOR SET 9V ELECTRIC SYSTEM $75.90
+0.8%
(US) TECHNIC: 9 V Motor Set (8720) $76.69
+1.8%
(US) NISB LEGO TECHNIC: 9 V Motor Set (8720) $79.99
+6.2%
(US) 9V Motor Set from BrickLink seller Josh1oreilly $80.00
+6.2%
(US) 9V Motor Set from BrickLink seller Josh1oreilly $80.00
+6.2%
(US) 9V Motor Set from BrickLink seller Josh1oreilly $80.00
+6.2%
(NL) 9V Motor Set from BrickLink seller jesseb $81.66
+8.4%
(US) 9V Motor Set from BrickLink seller hookedonbricks $81.99
+8.9%
Picked for your regionShow 2 more listings

Sales Distribution (Last 90 Days)

This chart shows the distribution of sales for the past three months of new/sealed 8720 9V Motor Set.

Market Momentum

Neutral
This set's value is slipping, so momentum is holding level.
DemandLower half in Technic
High demand
12 months agoToday
SupplyFewer than most in Technic
About as many as a year ago
12 months agoToday
Growth vs peers-7% typical for Supplementary
-6% over the past year
12 months agoToday
Outlook:17% bearish·73% neutral·10% bullish
Why it's moving, signals and outlook

Compared with other Supplementary sets

Why does 9V Motor Set place near the bottom of the Supplementary sets? Mostly because it began at several times the retail price of the typical set above it.

#15 of 18
By growth since retail, +109%
+30%+3,028%
In the bottom quarter of the group.
$1.32 a piece
New and sealed value per piece
This set
$1.32
Typical
$0.80
About 65% above the group's typical value per piece.
Top sets by growthSince retail
1877 Steering Gear Parts+3,028%
2879 Gear Wheels with Chain Links+2,418%
3961 Parts Pack+1,293%
158720 9V Motor Set+109%

Sets in Technic / Supplementary

8710 Technical Elements

Theme / Subtheme Technic / Supplementary
Year 1981
Pieces 124
Availability Retired
8710 LEGO Technical Elements
Retail $12.00
Value $43.46
Growth  +262.2%
Annual growth 3.2%

879 Gear Wheels with Chain Links

Theme / Subtheme Technic / Supplementary
Year 1979
Pieces 87
Availability Retired
879 LEGO Technic Gear Wheels with Chain Links
Retail $4.50
Value $113.33
Growth  +2418.4%
Annual growth 7.1%

871 Supplementary Set

Theme / Subtheme Technic / Supplementary
Year 1977
Pieces 78
Availability Retired
871 LEGO Technic Supplementary Set
Retail $9.99
Value $98.82
Growth  +889.2%
Annual growth 4.8%

961 Parts Pack

Theme / Subtheme Technic / Supplementary
Year 1978
Pieces 78
Availability Retired
961 LEGO Technic Parts Pack
Retail $5.00
Value $69.66
Growth  +1293.2%
Annual growth 7.5%

872 Two Gear Blocks

Theme / Subtheme Technic / Supplementary
Year 1978
Pieces 77
Availability Retired
872 LEGO Technic Two Gear Blocks
Retail $19.50
Value $35.35
Growth  +81.3%
Annual growth 3.3%

8735 Motor Set, 9 V

Theme / Subtheme Technic / Supplementary
Year 1997
Pieces 60
Availability Retired
8735 LEGO Technic Motor Set, 9 V
Retail $39.99
Value $52.13
Growth  +30.4%

878 Piston Parts

Theme / Subtheme Technic / Supplementary
Year 1979
Pieces 52
Availability Retired
878 LEGO Technic Piston Parts
Retail $4.50
Value $33.47
Growth  +643.8%
Annual growth 4.4%

874 Yellow Beams with Connector Pegs

Theme / Subtheme Technic / Supplementary
Year 1979
Pieces 38
Availability Retired
874 LEGO Technic Yellow Beams with Connector Pegs
Retail $5.00
Value $28.13
Growth  +462.6%
Annual growth 3.7%

875 Red Beams with Connector Pegs

Theme / Subtheme Technic / Supplementary
Year 1979
Pieces 38
Availability Retired
875 LEGO Technic Red Beams with Connector Pegs
Retail $5.00
Value $21.49
Growth  +329.8%
Annual growth 5.3%

876 Blue Beams with Connector Pegs

Theme / Subtheme Technic / Supplementary
Year 1979
Pieces 38
Availability Retired
876 LEGO Technic Blue Beams with Connector Pegs
Retail $5.00
Value $19.87
Growth  +297.4%
Annual growth 3.0%

8700 Power Pack

Theme / Subtheme Technic / Supplementary
Year 1982
Pieces 26
Availability Retired
8700 LEGO Technic Power Pack
Retail $26.00
Value $63.22
Growth  +143.2%
Annual growth 1.9%

877 Steering Gear Parts

Theme / Subtheme Technic / Supplementary
Year 1979
Pieces 24
Availability Retired
877 LEGO Technic Steering Gear Parts
Retail $3.50
Value $109.47
Growth  +3027.7%
Annual growth 7.6%

870 Technical Motor, 4.5 V

Theme / Subtheme Technic / Supplementary
Year 1977
Pieces 22
Availability Retired
870 LEGO Technical Motor, 4.5 V
Retail $8.99
Value $82.86
Growth  +821.7%
Annual growth 4.6%

880 12 Volt Motor

Theme / Subtheme Technic / Supplementary
Year 1979
Pieces 22
Availability Retired
880 LEGO Technic 12 Volt Motor
Retail $19.99
Value $39.99
Growth  +100.1%
Annual growth 5.4%

960 Power Pack

Theme / Subtheme Technic / Supplementary
Year 1978
Pieces 22
Availability Retired
960 LEGO Technic Power Pack
Retail $22.50
Value $73.05
Growth  +224.7%
Annual growth 2.5%

8712 Technic Figures

Theme / Subtheme Technic / Supplementary
Year 1988
Pieces / Figures 10 / 3
Availability Retired
8712 LEGO Technic Figures
Retail $8.25
Value $57.52
Growth  +597.2%
Annual growth 5.2%

8714 The LEGO Technic Guys

Theme / Subtheme Technic / Supplementary
Year 1993
Pieces / Figures 9 / 3
Availability Retired
8714 The LEGO Technic Guys
Retail $8.99
Value $99.71
Growth  +1009.1%
Annual growth 3.9%

9V Motor Set Questions

What is the current value of LEGO 8720 9V Motor Set?

Sealed in its box, 9V Motor Set is valued at $75, with most sales landing between $66 and $80. Used copies are worth about $45.

Is LEGO 8720 9V Motor Set retired?

Yes. LEGO no longer makes 9V Motor Set. Sealed copies are now found only on the secondary market, so the price follows what collectors will pay.

How much has LEGO 8720 9V Motor Set gone up in value?

9V Motor Set has gained 109% on its original retail price of $35.99, or roughly 2.5% a year on average. That trails the Supplementary average of 3.4% a year.

What will LEGO 8720 9V Motor Set be worth next year?

If its long-run trend holds, 9V Motor Set should be valued near $76 next year, close to where it is today. In the short term the market reads neutral. Signals from demand, supply and price are mixed. Like any forecast, this is an estimate.

How big is LEGO 8720 9V Motor Set?

9V Motor Set has 57 pieces ($0.63 a piece at its retail price).

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My Collection

9V Motor Set Reviews

25 reviews
4.7
Collectors
Investors
BrickEconomy Member Review
“The 9V Motor Set is a fantastic addition for Technic fans who enjoy hands-on play. It’s perfect for enhancing older sets with motorized functions, and even allows for creative builds like makeshift remote-controlled cars! While it's not as sleek as newer power functions, its versatility and nostalgic appeal make it a great fit for classic Technic enthusiasts.”
 

About Technic Supplementary

The LEGO Technic Supplementary theme, active from 1977 to 1997, consists of a variety of accessory sets designed to enhance and expand existing Technic models. These sets provided additional parts, such as gears, wheels, axles, and motors, allowing builders to add more functionality and complexity to their creations. Notable sets in this theme include the "870 Technical Motor," which introduced a battery-powered motor for motorizing models, and the "8710 Supplementary Set," a collection of gears and other essential mechanical parts.

Supplementary consists of 18 sets that ran from 1977 to 1997. As of today, 879 Gear Wheels with Chain Links is the most valuable Supplementary set with an estimated new/factory sealed value of $113.
Summary
Technic Supplementary 9V Motor Set set 8720 was released in September 1990, retailing for $36, but has since been retired. New, unopened 9V Motor Set sets are valued at $75, while used sets can be found for $45.
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8720 TECHNIC 9V Motor Set with motor, battery box and building elements. Can be built into many TECHNIC models. From 9 years
Description provided by LEGO©