Boxerworks.com

Hi everyone,

I recently picked up a pre-1980 style airbox and starter cover, which I installed on my '83 R100RS, basically just for looks.

Of course, I had to swap the breather hoses as well, specifically I had to get the dual hose system because both the halves of the airbox I got have the hole for the breather hose to go in, so I got the breather-to-T hose, and then the T-to-filter-half hoses, which are not interchangeable from left to right from what I noticed.

Now, I very quickly noticed how the fitting of these hoses is not particularly easy, especially for the left half (which from what I understood, is the "removable" half for air filter changes)

Does anybody have some sort of tricks or suggestions to make this thing easier? Or should I just remove the hoses after the "T" junction and put some sort of PCV/breather filter and call it a day in the name of my mental sanity?

Thanks in advance!
Leo

Sorry, how are you finding it difficult to fit?

Rob

Rob Frankham wrote: ↑Sun Mar 15, 2026 9:12 am Sorry, how are you finding it difficult to fit?

Rob

Maybe I’m approaching this wrong but the hose that goes to the left half of the airbox seems short, so whenever I go and get that left half out of the way to fit the filter in, the hose slips out, giving me very little space for movement and fitment

I’m pretty sure the hoses are original since I personally took them off of a 1979 donor bike, together with all the other parts