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11/2/2011
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Denton, TX
US
moore433
2/25/2013 7:48am
2/25/2013 7:48am
Edited Date/Time
3/5/2013 9:02am
We went to the track yesterday (Swan mx) and when we started my 05 crf 450r, as soon as you'd crack the throttle it would back fire and pop and the throttle response seemed very slow. I took the pilot jet out and cleaned it, same result. I installed a larger pilot and had the same result.
could the little jet thats made into the bottom housing of the carb cause the popping I'm having?? I forget the name of that little jet...
Thanks for any help..
PS. the last time this bike acted similarly, I had to replace all of the electronics on the bike.
could the little jet thats made into the bottom housing of the carb cause the popping I'm having?? I forget the name of that little jet...
Thanks for any help..
PS. the last time this bike acted similarly, I had to replace all of the electronics on the bike.
Also could be the cam is miss timed or jumped a tooth, that could be big trouble.
I'll check the accelerator pump when I get home, thanks for the tip....It had a full rebuild less than 5hrs riding time ago and a new timing chain tensioner was installed at the time. I'll check the timing too...
As for the carb, check for Airleaks using WD40 (Spray the carb boots with WD40, it will surge if their is an airleak and the WD hits it. Also check your AP diaphram, if they crack it's been known to cause backfiring. You seem to somewhat understand jetting, so check that out along with your fuel mixture.
Also try the BK mod, some people have fixed bog probs with it.
All else fails, check to see if your stator has found it's way off time some how, it's a long shot.. but it's plausible.
The Shop
I believe the stator is going out again..
What do you guy's think?? Thanks for all of the help guy's!!!
Thanks for a couple more obvious ideas that it could really be, but are so obvious you don't always think of them. I'll give them a try as soon as I get my new cam chain tensioner comes in. This is the 2nd stock Honda one that has broken on me. I'm getting a manual one & will never run a stock one again..
Thanks again for the tips...
Valve seats may be bad.
One of the boys has one and it was hard to start and if it did it would pop etc... Changed the valves and it worked for a short time then it started again...
Long story short.... Purchased a new stock head, put it all back together and presto! Good running bike! Cheaper to buy a new head than have the seats replaced.... Honda's are soft or were soft in the valve seat areas....
Hope this helps too...
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