Critical Update For Grubee 4 Stroke Kit Gear Box

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birddog

Guest
Problem:
The gearbox clutch retaining bolt used in the manufacture of Grubee gearboxes on 4 stroke kits prior to October 1st has a minor, but critical design flaw. The bolt used to hold on the primary gear and bell housing is not long enough. This bolt does not get a good “bite” with enough threads and may come loose causing damage to the gear box and gears.

Solution:
If you currently own one of these gearboxes please contact your dealer for the free replacement hardware. If your dealer is unable to provide the correct hardware please see the specs listed below. Most kits currently being sold should now include the longer bolt and instructions to be installed by the purchaser. Please see below for complete hardware specs and instructions for replacement.

New Hardware Specs:
Machine Screw (M6 – 1.00 x 20)
Lock Washer (M – 6)
Fender Washer (1/4” x 5/8”)

http://www.bicycle-engines.com/images/ReplacementBolt.jpg


Replacement Instructions:

Step 1
Remove the 3 slotted head bolts that hold on the gear box cover and remove to expose the clutch retainer bolt (silver bolt on the gear farthest to the left).

http://www.bicycle-engines.com/images/GearBoxCoverOff.jpg

Step 2
Remove the existing clutch retainer bolt. To prevent the shaft from spinning while removing the bolt, carefully insert a screw driver into the flywheel on the opposite side. Be sure not to damage the flywheel fins or the magneto surface. Wedge it in place so that it will not spin and unscrew the existing clutch retainer bolt using a flat screwdriver.

http://www.bicycle-engines.com/images/RemovingClutchBolt.jpg

Step 3
Replace with the included bolt and washers. To tighten the new clutch retainer bolt, hold the pull start rope to prevent the shaft from turning or use the screwdriver method shown in step 2

http://www.bicycle-engines.com/images/HoldingPullStart.jpg

Step 4
Replace the gearbox cover and the secure the 3 bolts. That’s it! Your upgrade is complete and ready to ride.:D
 
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Z

Zomby Builder

Guest
Omg

Is that a REAL SCREW or ahh hummmmm, a SEARS SCREW??? Sorry I just could not resist,, Frank Z. Is this manufacturor recalling or ??????????????? Californias GOT the most of them
OH LORD they got a Host of them
 
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birddog

Guest
No, there is no recall. Some gearboxes never even have a problem, but it is best to replace them just in case. Dealers should provide the hardware for free and it is a simple fix.
 
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bryanmargolis

Guest
"MBc EDIT - This post contained content that is listed in the MotoredBikes.com rules as unacceptable."

how dare you post that phrase here?!?

once more for a permanent ban!!

all: you have to start using the "report this post" feature, please!

aug
 
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G

gone_fishin

Guest
bryanmargolis...this reply is for you...you post anything like that here again and you will be permanently banned!!
 
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