powervalve/top end problem still!

[moff747]

I have fitted my new reeds, the old reeds had seen better days and 1 was split.While I had the carb off I noticed 2 of the pipes coming from the carb were clogged with mud so I cleaned them out. The problem is now cured completely, the bike now runs superb from low revs all the way to the top! and is consistant with it. As it was sugested the damaged reeds must have been overfueling it at low rpm.Thanks people for all the help.

[ducncover]

I apologize in advance for this long post...but I have spent nearly 3 solid moths trouble shooting this problem.

I have had this dilemma for awhile with my 2001 EC 250 and I think I have finally come close to figuring it out.

Let me first say that I bought this bike used and did not know the maintenance history. It ran like crap and fouled plugs from the moment I bought it. It would not come on the pipe and it smoked like crazy.

After I replaced reeds, checked the power valve, swapped CDIs, replaced the right side crank seal, rejetted with a LTR Kit (180 main, 42 pilot and clip in the middle position on an LTR needle), checked the float level multiple times, changed brands and heat index of plugs, repacked silencer...etc, nothing improved.

I went for a test ride the other day and noticed that as the bike started to run out of gas, it perked up and ran fantastic. The moment I switched to reserve and supplied fuel to the carb, it started to bog out and smoke again at 3/4 - WOT.

This means I needed to lean the bike by adjusting the main jet or reduce the fuel level somehow.

I did both...

Today, I replaced the needle valve assembly in the float bowl which controls fuel entry into the bowl and went from a 180 main to a 172. I am also 3.5 - 4 (way too many) turns out on the air screw. The problem is almost gone. I may try a smaller main to see if it improves.

The only thing I am concerned about now is that somebody in another posts mentioned a spring that surrounds the needle jet under the float tab... I do not have one of these in my carb.

[Loosenut]

The only thing I am concerned about now is that somebody in another posts mentioned a spring that surrounds the needle jet under the float tab... I do not have one of these in my carb.

Yes you carb does. The bendable tab on the float makes contact with the spring loaded plunger. It like a tiny shock to keep the float tab from bending while getting slammed around from riding through bumps and landing from jumps. You want to set you float height without depressing the plunger (tiny shock). Slap a 42 pilot in that bike with the 172. Try the LTR needle with the clip in the middle position as well as the #2 and #4 positions.

It is still possible that your carb is worn out. I know I have seen 2 gassers newer than yours that needed new carbs. However, you can have your carb fixed, tweaked and jetted by Ron and be done with all the BS. I plan on sending Ron a carb this summer. It should be interesting.

Mike

[ducncover]

Originally Posted by Loosenut

Yes you carb does[.......]Slap a 42 pilot in that bike with the 172. Try the LTR needle with the clip in the middle position as well as the #2 and #4 positions.

It is still possible that your carb is worn out. I know I have seen 2 gassers newer than yours that needed new carbs. However, you can have your carb fixed, tweaked and jetted by Ron and be done with all the BS. I plan on sending Ron a carb this summer. It should be interesting.

Mike

Thanks. Running a 42 right now.

What is Ron's address? How can a carb be worn out? I might look into him rebuilding my carb.