CB300F compatible top triple clamp raise handlebar higher fits cbr250 - Honda CBR250R Forum : Honda CBR 250 Forums
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post #1 of 53 Old 12-14-2014, 08:58 AM Thread Starter
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CB300F compatible top triple clamp raise handlebar higher fits cbr250

I noticed the new triple clamp designed on the cb300f and wondered whether this part will interchange easily on the CBR250 to get us a more upright position. This looks like the hot ticket to adapt to our bikes to make riding more comfortable over those long hauls. And the wider grip position will make handling easier too, although it's already easy enough w/ the clip ons. Any thoughts on this not working out?
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post #2 of 53 Old 12-14-2014, 12:38 PM
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What about the wind screen?
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post #3 of 53 Old 12-14-2014, 01:50 PM
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Cb250f

When I first saw the CB300F I wanted one because of the upright riding position, unfortunately I can't buy one (something to do with "The grass is always greener . . ."), so last week I ordered a top fork bridge to find out if it is compatible with our steering stem. It will be here tomorrow.
CB300F parts needed
1. bridge, top fork
2. holder (clamp for bars)
3. handlebars
4. longer throttle cables (A & B)
5. longer clutch cable
6. longer brake hose
7. Misc nut, bolts, etc.
If the 250's steering stem don't work with the CB300 fork bridge a CB300 steering stem will be needed. I will find out if they fit in a day or two. The left and right handlebar switches will probably need longer wires, so you probably need CB300 switches unless you are handy with a soldering iron and heat shrink tubing. If you want handlebar mounted mirrors like on the CB300 you also need a new master cylinder and clutch lever clamp off the CB300 that's were the mirrors mount.

The grass is always greener . . .

Last edited by gyrotumbler; 12-14-2014 at 02:46 PM. Reason: cbr250 master cyl. and clutch lever clamp are threaded for mirrors, has plastic plug in holes
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post #4 of 53 Old 12-14-2014, 02:16 PM
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The CB300F Steering Stem is different from the one used on the CBR250R & 300R... not sure if that means you would need to change the steering stem or not.

As isaacm12 points out, I'm sure there would be clearance issues with the CBR's windscreen when making tighter turns.
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post #5 of 53 Old 12-14-2014, 07:01 PM
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CB250F project

Well the mailman came today, (I forgot about Sunday delivery) and delivered my CB300F top fork bridge. Just setting it on top of forks everything looks to line up perfectly. I will install it tomorrow, then order the handlebars, top clamp, and brake hose. The throttle, clutch cables, and switch wires may reach when moved from the front of the forks/top bridge to the rear.
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The grass is always greener . . .
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post #6 of 53 Old 12-14-2014, 07:12 PM
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Please keep this post coming and let us know when you get this done and tested. I was considering Helibars but this looks even better if it all works out and clears the windscreen....Thanks.

Last edited by PSUrider; 12-14-2014 at 07:13 PM. Reason: typo
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post #7 of 53 Old 12-15-2014, 11:04 AM Thread Starter
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OH my...indeed this FITS !!???
Very excited!

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post #8 of 53 Old 12-15-2014, 09:50 PM
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Switching the fork bridge

I installed the top fork bridge today, everything went well, everything fits good. The only difference is the hole for the ignition switch is a couple of mm bigger. It is difficult to see in the pictures. I think I can put a rubber o-ring in the space and it will look good. I ordered the handlebars, cables, brake hose, and other misc. hardware today. Got a little delay when I got an email from my parts supplier saying that the handlebars are on back order with no ETA. Changing the ignition switch is a little involved because it is held in with one-way screws. I had to cut slots in the head of the screws for a screw driver to remove them. Honda sells replacement one-way screws, but I don't know if a special tool is needed to install them, so I made my own. Took two M8-1.25x25mm cap screws rounded off the heads on a grinder, installed them, then drilled out the head so a allen wrench no longer catches. I added washers on the cap screws because the head are smaller than the originals. The screws on the right are the original Honda one way screws. Also you need to use a triple tree stand when removing the top bridge because the weight of the bike flexes the steering stem just enough that the top bridge interferes with the steering stem threads.
Now i wait.
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The grass is always greener . . .
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post #9 of 53 Old 12-16-2014, 09:59 AM
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When you remove the clip-ons and complete the job, Do you plan to slide the fork tubes down and increase front end height? Also how much will this change the hand grip positions? 1) distance up? 2) distance back? 3) how much wider?. I plan to wait for you to finish paving the way before ordering my parts. Also any Idea on total cost of this upgrade? Thanks again.

Last edited by PSUrider; 12-16-2014 at 12:39 PM. Reason: I looked up the parts and seems to be good deal. About $130 US dollars plus cables and brake lines if neccesary.
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post #10 of 53 Old 12-16-2014, 11:03 AM Thread Starter
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Quote:
Originally Posted by gyrotumbler View Post
The only difference is the hole for the ignition switch is a couple of mm bigger. It is difficult to see in the pictures. I think I can put a rubber o-ring in the space and it will look good.
THX for doing the legwork for us!

Do you think maybe a section of 1" PVC pipe could work to fill in the gap?



That's a bummer that the handlebar's on back order.
I suppose a dirt bike handlebar can work out as a substitue, but
that would mean locating new bar end weights and having to mod something to address the nubs sticking down under the throttle and turn signal collars. I know from sitting on that 300F, the stock 300F bar is PERFECTLY contoured for me. That is my 1st choice for a bar, so I suppose it's worth the wait just to have it.

EDIT:

BTW... do you think the 300F bar will clear the screen? Not that it matters, b/c the end improvement clearly justifies the means.

Last edited by Pro; 12-16-2014 at 11:07 AM.
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