Boge Mulholland shocks (by Interpart)
Boge Mulholland Shocks (Click to enlarge)
Boge Mulholland shocks were a popular inexpensive alternative to the more expensive after market shocks of the late 60's and into the 70's. Boge shocks were unique in that they offered not only the ability to be rebuilt, unlike the shocks that came stock on most Japanese dirt and street bikes at the time, they also were somewhat adjustable for rider preference. While stock Japanese shocks may have featured spring preload adjustment for rider weight, they lacked any sort of damping adjustment. The common complaint of motorcycle testers of the early 70's was that factory Japanese shocks lacked sufficient damping (mostly rebound) to control the heavy springs they were putting on the bikes of the day. While there were other aftermarket shocks available with different spring rates, damping, ect.. there was really not much out there for the budget minded rider that also wanted to fine tune his experience. Boge Mulholland had a fairly wide array of shocks to fit various bikes (not just Japanese bikes) or could be ordered by eye to eye length, they also delved into the "evolution" bikes with the lay down shocks. Reports say that Mulholland shocks are definately better than the stock shocks they are not "the best" aftermarket shock that were available at the time. However if you are building a vintage weekend warrior type bike they can be an inexpensive period correct alternative to the more desirable period correct shocks of the day and even modern equivalents. Below are Boge Mulholland shock disassemble and assembly instructions as well as parts breakdown and exploded views. The scans from the magazine are as big as possible so I hope this information is of use to someone looking for specifications and information on Boge Mulholland shocks of the 70's. This page may update as i run across more information. Scroll for more detailed information. Click the pictures for a larger version.
Part 1 Boge Mulholland shock dis-assembly
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Part 2 Boge Mulholland shock assembly
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Boge Mulholland shock parts breakdown and exploded view
Boge Mulholland shocks are typically identified by the color.
Orange for motocross/dirt bike application Black for street bike applications The shocks are fairly universal so long as you have the correct length stipulated by the stock shock length. Aftermarket spring rates were available (and may still be available) for different rider weights. See chart. Shock oil capacities (+/- 3cc) and eye to eye length Shock p/n (from above image) Motocross (dirt bike) MX1075 74CC 10 3/4in MX1175 87CC 11 3/4in MX1225 95CC 12 1/4in MX1300 98CC 13in MX1350 110CC 13 1/2in MX1400 122CC 14in Super Sport (street bike) SS1175 87CC 11 3/4in SS1225 95CC 12 1/4in SS1300 110CC 13in SS1350 117CC 13 1/2in SS12608 91CC 12.4in SS12610 91CC 12.6in SS13305 105CC 13 1/2in SS13310 105CC 13 3/4in SS13010 100CC 13in 
Restoring the Mulholland shocks
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Boge Mulholland shock general model information
Boge Mulholland shock spring rates availability
Mulholland by Interpart
Need some help dismantling and rebuilding your Boge Mulholland shocks? Here is a blog posting from a user who gave me props and referenced my site as having useful information for the rebuilding process. So I will return the favor to this blogger who did a nice write up with pictures on his rebuild of some Mulholland shocks. You can visit his site HERE for a closer look. I didn't take pictures during my restore of these shocks but he did so I thought I would pass along the information.
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