7/14/2018 2:38 PM
Edited Date/Time: 7/14/2018 2:39 PM
Mx746 wrote:
If you dont mind the possibility of constant flame outs. I wouldnt ride it if it was free. Thats how much I distrust cr's of this era. Some people had no problems at all, others , including most magazine tests had at least some problem with flame outs.
From MXA
Every fuel-injected Honda CRF450 has been prone to flame-out. Flame-out is when roll you the throttle off to get slowed down and the engine goes “poof” and quits running. Flame-out was a major issue on the 2009–2012 CRFs, but has been less of an issue since then. If you have trouble with flame-out, and we have even seen Cole Seely’s works CRF450 suffer flame-out issues during the 2017 Supercross series, we suggest turning the idle up to help keep the engine percolating at low speeds
Tokyo_Tiddler wrote:
Ah yes.. flame outs.. that required some tweaks, also including stiffening the decompression spring thingamabob on the camshaft.
Mx746 wrote:
Actually the spring was a little too stiff, activating the decomp too soon, reducing tension on the spring allowed for a little more chug before the poof, but you had to get it to where it almost didn't lift the weight. It helped a little with chug stalling, but not flame outs.
It has been a while since I made the mods.. I thought I stiffened, but you are probably right. The 3 best things that helped the flame outs were going to VP T4 race fuel, insulating the fuel tank from heat, and keeping the idle speed at 1850+.
Mapping did little to improve. The throttle body mods may have improved a bit but not much.. not the way the above 3 mods did. It will still flame out on occasion but not the dangerous situation it was stock.. cranking the throttle in a slow corner just before a double could kill the engine just as you are going up the ramp.
The 2012 model improved some of the problems but didn't fix them, in my opinion. Once all the caveats are properly addressed, it is a great engine, suspension and handling.
The Honda race team had some of their best rides on this bike.. Reed, Canard, Windham.