Did you run into any problems? Do you think all 06+ CRF heads fit on 06+ trxs?
CRF TRX head swap
1 - 15 of 15 Posts
that is the sicest trike i've ever seen!!!!
that is the sicest trike i've ever seen!!!![/b]
diddo
that is a sick trikethat is the sicest trike i've ever seen!!!![/b]
diddo
[/b]
what is this swap supposed to gain you?
You have to show us more pictures of that thing. looks like you did one heck of a job there!
that is friggin sweet. more details of your build
Thanks everyone. There is more info on the Trike in this thread
http://www.trx450r.org/forum/index.php?showtopic=63404
to answer the questions in order of being asked.
1. The only problems i ran into concerned the pipe and carb. The exhaust port exits more to the right...looking down from top...this probably would not be a problem on a TRX but on my frame the "joint" is in the same area as the pipe routing. When i originally built the frame i had the TRX head on so i built a relief in the frame rail. when i swapped head the relief was not deep enough so i had to re cut and make it deeper. I doubt this would be a issue on a TRX since I'm nowhere near the "original" frame rail.
The carburetor intake is angled differently. it has a slight down angle to it. It requires a little persuasion to get the boot on all the way. Once it was on it kinda reformed it self and now goes on and of pretty easy.
2. the 02-06 CRF Heads are interchangable but the 06 has a larger Ex valve.
3. As already mentioned the intake and exhaust ports are slightly different as they enter/exit the head. Also The CRF has a larger Ex valve. The CRF head does not have the thermostat.
4. The "gain" or original reason for the swap was to eliminate the thermostat. I did not need it or the fan that comes on the TRX. During the build i discovered the thermostat intake would Hit the radiator and the hoses would not go on. I could have made a bracket to push the radiator forward but then The shroud would not line up. Also i would have to deal with the other outlet. By doing this swap i eliminated all those issues. The Added benefit was the port layout that can not be duplicated by simple porting.
The CRF head moves the powerband to more mid to top compared to the TRX low to mid style.
http://www.trx450r.org/forum/index.php?showtopic=63404
to answer the questions in order of being asked.
1. The only problems i ran into concerned the pipe and carb. The exhaust port exits more to the right...looking down from top...this probably would not be a problem on a TRX but on my frame the "joint" is in the same area as the pipe routing. When i originally built the frame i had the TRX head on so i built a relief in the frame rail. when i swapped head the relief was not deep enough so i had to re cut and make it deeper. I doubt this would be a issue on a TRX since I'm nowhere near the "original" frame rail.
The carburetor intake is angled differently. it has a slight down angle to it. It requires a little persuasion to get the boot on all the way. Once it was on it kinda reformed it self and now goes on and of pretty easy.
2. the 02-06 CRF Heads are interchangable but the 06 has a larger Ex valve.
3. As already mentioned the intake and exhaust ports are slightly different as they enter/exit the head. Also The CRF has a larger Ex valve. The CRF head does not have the thermostat.
4. The "gain" or original reason for the swap was to eliminate the thermostat. I did not need it or the fan that comes on the TRX. During the build i discovered the thermostat intake would Hit the radiator and the hoses would not go on. I could have made a bracket to push the radiator forward but then The shroud would not line up. Also i would have to deal with the other outlet. By doing this swap i eliminated all those issues. The Added benefit was the port layout that can not be duplicated by simple porting.
The CRF head moves the powerband to more mid to top compared to the TRX low to mid style.
Ive never thought of doing this. But i was under the impression that the 06 and up motors were made after the crf 450x. Please correct me if im wrong.
Everytime i see that trike it makes me want to resurect my 250r
Everytime i see that trike it makes me want to resurect my 250r
Ive never thought of doing this. But i was under the impression that the 06 and up motors were made after the crf 450x. Please correct me if im wrong.
Everytime i see that trike it makes me want to resurect my 250r[/b]
I'm not sure about the CRF X motor. I used a CRF R head and it was internally differant then the TRX.
you are a bad man, I'll tell you that
Us guys that race dezert run the R head on the 05-07 X's...... moves the powerband up and has bigger valves to make more power!!!! The 08 X's have a pretty good head!!!!Ive never thought of doing this. But i was under the impression that the 06 and up motors were made after the crf 450x. Please correct me if im wrong.
Everytime i see that trike it makes me want to resurect my 250r[/b]
I'm not sure about the CRF X motor. I used a CRF R head and it was internally differant then the TRX.
[/b]
that is one sweet trike, you did a really nice job on it
1 - 15 of 15 Posts
- This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Honda TRX 450R
A forum community dedicated to Honda TRX 450r owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, classifieds, maintenance, and more!
Full Forum Listing
Top Contributors this Month
View All
Bullvine rider!!
176 Replies
Walt427450R
20 Replies
SKPrairie450
18 Replies
