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Author Topic: CRF front master cylinder  (Read 112 times)

Offline Hawaiiysr

CRF front master cylinder
« on: July 29, 2020, 01:02:57 AM »
Since the price of TRX parts are on the rise I find it beneficial to all to find parts that are not only a cost effective replacement but also OEM Honda.

Here I'll be installing a CRF front brake master cylinder.
Any year CRF250/450 can be used.
The body of the cylinder is smaller than the stock TRX and will clean up the handle bars nicely. These are easily found used in great condition on eBay or group pages on Facebook.

Let's get to it.


Top is a CRF. Bottom is TRX. Notice the TRX has a much thicker mount for the handle bars. This thicker mount is so the master will clear the throttle.

Here is a picture of the CRF master on the bars. Notice the master is touching the throttle. Also the brake line is touching the bars. Clearance needs to be made to properly mount the CFR master.
But how you ask? The solution is simple.
You'll need a spacer like this:

You can purchase this spacer at one of two places.
(Mike's custom machine link)
                    or
(eBay dick head)https://www.ebay.com/itm/274438804438
I personally would purchase from Mike. His customer service is great and he is so easy to work with. My spacer came from Mike. I'll give him a good plug at the end of this post.


Notice now with the spacer installed the CRF master (bottom) now has the same mounting distance as the TRX master (top).
And here she is all installed. Clearance is good next to the throttle and the brake line clears as well.
« Last Edit: July 29, 2020, 01:41:07 AM by Hawaiiysr »

Offline The norm

Re: CRF front master cylinder
« Reply #1 on: July 29, 2020, 01:55:18 AM »
Thanks for the help Josh! I'm waiting on parts from Mike as we speak!
1986 Trx250r-- Hybrid Engineering 391(Good bye super 310)
1986 Trx250r-- Hybrid Engineering  ported stock 86 cylinder
1986 Trx250r-- craigslist engine with unknown ported 89 cylinder.
1985 Atc250r-- Needs a lot of work (Super 310's new home)

Offline desertR

Re: CRF front master cylinder
« Reply #2 on: July 29, 2020, 03:18:05 AM »
Personally I think the TRX450r front master is a better way to go. The CRF is designed for 1 caliper while the TRX450r is designed for 2 calipers, Handlebar fit requires no additional pieces, and the TRX cylinder is slightly larger in diameter, so it may shorten the lever movement.
desertR

Offline The norm

Re: CRF front master cylinder
« Reply #3 on: July 29, 2020, 11:27:27 AM »
So from what I read online the people that have swapped to a crf master cylinder report having a more positive brake feel. Like having a smaller piston was an improvement.
Loren
1986 Trx250r-- Hybrid Engineering 391(Good bye super 310)
1986 Trx250r-- Hybrid Engineering  ported stock 86 cylinder
1986 Trx250r-- craigslist engine with unknown ported 89 cylinder.
1985 Atc250r-- Needs a lot of work (Super 310's new home)

Offline F-Red

Re: CRF front master cylinder
« Reply #4 on: July 29, 2020, 01:59:26 PM »
Nice find Josh. It's always nice to have options.

I do have to agree with the Desert man. The 450R's braking system is a superior upgrade.
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