CRF 450 top end power

7/11/2016 10:00am
What's the cheapest way to gain some top end power without shortening my engine life?

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Jrewing
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7/11/2016 6:37pm Edited Date/Time 7/11/2016 6:37pm
Slip on single. Even a 2010 2nd hand single will fit- that'd be the cheapest. Remap ecu and pull backfire screen.

What year btw
7/11/2016 10:45pm
Cheers for that It's a 2016 model, I've been looking at fmf single pipes for it but wasn't sure what was the best route to go down with four strokes.
Jrewing
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7/12/2016 2:25am
Yeah then single, map, filter screen and even a cam if you can fit yourself. They're pretty fast after that.
Paw Paw 271
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7/13/2016 11:22am
Pick up a complete APE head. It will do the trick and is ready to install. Much better ports.

Paw Paw

The Shop

lumpy790
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7/13/2016 11:25am
Curious ..... Why do you NEED more top end power? Are you a bam bam rider?
Bruneval
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7/13/2016 12:42pm
On my 2012 CRF 450, I did the following:

- Full Leo Vince pipe
- Removed backfire screen
- Dynojet EFI programmer with map for the above mods

Standard everything else.

Turned it from a lazy motor that used to backfire and cut-out to a monster. Lent it to a friend of mine last year and he pulled the holeshot and won the race:

https://www.youtube.com/watch?v=VkY8npCaXgA
7/13/2016 2:16pm
lumpy790 wrote:
Curious ..... Why do you NEED more top end power? Are you a bam bam rider?
I don't NEED it but that doesn't mean it isn't fun to have it.

Just had a quick look for an APE head but their website only lists 02-06, I might send them an email about a 16 model head and see if they make them or not.

With the dynojet Is it pretty self explanatory or do you need to know about mapping engines beforehand?

Cheers for the help guys much appreciated.
Bruneval
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7/13/2016 2:43pm
I have the dynojet on the 450, and it takes a while to fit as it connects in 2 or 3 places in the wiring harness. You can connect a laptop to the control module and then upload any number of the maps for your bike. The maps can be downloaded from their website, and they are also on a CD that comes in the box. All fairly easy if you're computer literate, and you don't have to make up the maps yourself. They are set for different configurations of parts and state of tune; e.g race pipe, high compression piston, cams etc, and for different fuels.

I have a Vortex ECU on a CRF 250 and it is the same as the above but much more user friendly. You just replace the stock ECU with the Vortex one and then use a screwdriver to alter the pre-programmed maps (no laptop required - means you can do it at the track). Downside is the cost, but you can pick used ones up on eBay.

Cheaper option is to buy one of those JD jetting piggyback systems. They do the same kind of job as above, but trick the system as opposed to altering the fuel/air mixture inside the ECU itself, if that makes sense. They're about 150 GBP.

If you want to wake up a CRF, a pipe and a remap is the best way and leave the rest of the engine standard. That said, my CRF 250 was slower than a week in jail, so put a Pro-Circuit cam in there too.
Jrewing
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7/13/2016 4:24pm
15-16's are fast with a slip on & remap, screen removed. Biggest problem with the bikes stock is they fall flat up top/overrev.
Clean up the ports around the bowls/seats, hi-comp piston, cam maybe too and you've got a bike that's national speed.
brocsdad
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7/14/2016 8:16am
Remove backfire screen, remap, Stage 2 Cam and a Yosh exhaust.

Good Luck!
adam8781
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7/14/2016 9:41am
dr d single
cam (ron hamp, or hot cams stage 3)
remap
remove backfire screen

hated the engine on my 14, if i kept it

pipe
remap
13.5 piston
cam

brocsdad
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7/14/2016 1:19pm
adam8781 wrote:
dr d single cam (ron hamp, or hot cams stage 3) remap remove backfire screen hated the engine on my 14, if i kept it pipe...
dr d single
cam (ron hamp, or hot cams stage 3)
remap
remove backfire screen

hated the engine on my 14, if i kept it

pipe
remap
13.5 piston
cam

Stage 3 will kill the bottom end
7/14/2016 4:03pm
My 14 has an FMF single.. stage two hot cams cam..13:5:1 JE piston..screenless filter and remap..
All I can say is the top end power is awesome.. it pulls very hard and very long.. To me its almost scary fast from mid to top..It Rocks!

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