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Seal-On Spark Plug Boots
Seal-On Spark Plug Boot

SEAL-ON™ SPARK PLUG BOOTS

BG’s Seal-On™ Boots prolong spark plug life because they seal out dirt and moisture. . .

Engine laboratory tests have shown that when the Seal-On™ Boot is used, flashover voltage is increased by 8-10KV. Unlike conventional spark plug boots, the BG Seal-On™ Boot is machined from PTFE to specific spark plug dimensions and seals tightly on the spark plug insulator. The boot design incorporates an industry standard type bayonet connector for ease of installation. The kit includes a PTFE grommet that is press fit into the upper end of the assembly so that the boot is sealed top and bottom – at the secondary lead and at the plug insulator. Kits are also available for use with “hi-resistance” wire, which include the stud and stud support required to terminate this type of wire (Assembly layout shown on page 41). Optional Seal-On™ Boot kits are also available for applications where 5/16” ID silicone hose is used. Available with DSTM connector.**

Improves ignition performance in demanding lean burn applications



SEAL-ON BOOT KIT PART NUMBERS LOCATE THE SPARK PLUG USED IN THE CHART BELOW AND ORDER THE CORRESPONDING SEAL-ON BOOT KIT.
For 7mm Cable With Hi-Resistance Conductor For 7mm Cable With Standard Conductor ++
Without
Hose
With
Hose
Without
Hose
With
Hose
21509SS 21644SS 21509* 21644* RM79F, W77N, RW82P, RM77N, D78Y, RB77WPC, All Unshielded Altronic, RS79N, RB777-X, GI3-X, etc.
21519SS 21573SS 21519 21573 RN79G, J6C, RL85G, RL15B, F100, N5C, 42XL, ST447, L82C, W3DPOR, GE3-X, etc.
21539SS 21645SS 21539 21645 W80N, W85N, D9, D15Y, RD16, D14N, D6, D14, RD10, ***
21594SS 21648SS 21594 21648 W14, W18, W10
21673SS 21676SS 21673 21676 RW80N, RW83F, RW77N, RW78N
21970SS 21984SS 21970+ 21984+# RC501P, RC78PYP, GK3-X
21894SS 21898SS 21894 21898 RB212-1, RB485-1
22448SS 22449SS 22448 22449 RB105-1, RB114-1
21862SS -- 21862 22857 ST197
21892SS 21896SS 21892 21896 ST847
21893SS 21897SS 21893 21897 ST727
22026SS 22027SS 22026 22027 R80

* This model available in 9” length. Specify -9 suffix (I.E. 21509-9)*
** For DS™ type connector specify kit model number with SS suffix.
*** These kits will also “seal-on” on Flash-Fighters shown on Page 11.
+ These models available in 4 1/2” lengths. Specify -4.5 suffix (I.E. 21970-4.5).
++ The kits shown in the columns below may be upgraded to Spike DS™ by ordering P/N 22390.
# This model available in 10” length. Specify 25189.
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