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  #61  
Old 09-29-2012, 10:06 PM
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Nice to see you Andrew.
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  #62  
Old 10-11-2012, 12:02 PM
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My carb has just start pissin. Petrol out like when I'm riding its fine but when idle petrol gushes out the carb ?? Ideas pls
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  #63  
Old 10-11-2012, 02:03 PM
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Sounds lean, right? Seriously you need to step back snd take a deep breath. Fuel overflowing MEANS that your float valve is not shutting off. Retread faded's post and set it to instructions. Pay attention and quit fighting it no matter how frustrated you are.
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  #64  
Old 10-29-2012, 06:50 AM
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Hello
Very interesting article about setting karburatora.Iskam ask can seem a bit silly but the adjustment to the level of the plate that it rests on the needle or am I wrong thing?
thank you
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  #65  
Old 07-07-2013, 03:58 PM
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If the float is set too low can it cause a dangerous lean condition? I adjusted mine without measuring it at the track and it cleaned up on top real nicely and over rev was smooth and peppy. I didn't take a plug reading as temps were heating up and I was trying to get some laps in before the broiler kicked on... and, I didn't really think it could lean it out until later.

I re read through this thread, and did a bit of surfing and still haven't found anything definite. A statement in the Dell'orto tuning guide eluded to low float level causing 'enleanment' but didn't specify if it was harmful to the engine.
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  #66  
Old 07-07-2013, 06:36 PM
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Well I assume your talking about the float height being set too high, so for example if the distance from the gasket surface to the designated point on the float is supposed to be 18mm and without checking, is set with a distance of 14mm, then the float valve would be shutting off too soon. The only thing I really encountered from this is the bike dying off at WOT not bogging just dying off till there was enough fuel back in the carb for it to pick up again. I could only suspect the same would happen. I guess it's kind of hard to tell because it could be acting like its running out of fuel OR running lean, I tend to think it would run lean as the fuel is not at the correct height thus the carb would not be getting the fuel and air mix delivered to the motor....
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  #67  
Old 08-24-2013, 12:37 PM
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Great post. Thanks!
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  #68  
Old 10-06-2013, 08:30 PM
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Quote:
Originally Posted by Dr. Destructo View Post
I have a question. I just tried to adjust my floats, which are shaped just like the ones in your pics, to 16mm. The previous adjustment was so far from 16mm when aiming for the very tip top of the float, that I began wondering if the very top of the float was the spot you were supposed to measure at. Just for the heck of it, I adjusted the float , setting the very top of it to 16mm, and it was quiet a huge change /adjustment to get it there! Something didnt seem right, -even with the carb completely upside down the fuel needle didnt seem like it was seated at all after this major float adjustment. I verified this by hooking a vacuum gauge to the fuel inlet and verified indeed the needle was not seating.

So I thought to myself, there's no way you measure at the very top of this float, but maybe closer to the linear line about 2/3 up, where its a normal "shape". I ended up adjusting my 16mm to line up with where the metal arms mold into the plastic float, and doing it this way gave me a sealed needle as judged by my vacuum gauge.

Im not questioning your writeup, Im questioning why did setting my float to 16mm the way you say cause some weird things to happen and actually hang my fuel pin up from seating?

Note= the bike spits whitish exhaust smoke at all times when reving from idle to full throttle in neutral (87 cr125)

Now i will go back to the garage and try this adjustment again.

I had a fairly similar issue.... Once set to 8.7mm ( well close as ) the float seemed to be a little angled ( very slightly ) when it just contacted the spring loaded part of the float needle... Should be correct I guess seeing that I measure just like you do...
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  #69  
Old 12-19-2013, 10:26 AM
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Faded - great article. I'm running into an issue with all of this though. I just bought a 2002 CR125 and following these instructions, I'm unable to get to the 16mm spec. When bending the tang, the best height I can achieve is 10.5mm before the tang contacts the edge of the fuel inlet needle valve rather than the internal spring bumper of the needle valve, as it should be doing. The amount that I had to bend to get it there was considerable too. I'm surprised it would have ever run in the position where it was before. I've attached some pictures including one with the floats re-installed at 10.5mm. What is it that I'm missing? Any help would be appreciated.

Carb1.pdf

Carb2.pdf

Float and Tang.pdf

Petcock.pdf
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  #70  
Old 12-19-2013, 11:07 AM
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Quote:
Originally Posted by Integracingsr View Post
Faded - great article. I'm running into an issue with all of this though. I just bought a 2002 CR125 and following these instructions, I'm unable to get to the 16mm spec. When bending the tang, the best height I can achieve is 10.5mm before the tang contacts the edge of the fuel inlet needle valve rather than the internal spring bumper of the needle valve, as it should be doing. The amount that I had to bend to get it there was considerable too. I'm surprised it would have ever run in the position where it was before. I've attached some pictures including one with the floats re-installed at 10.5mm. What is it that I'm missing? Any help would be appreciated.

Attachment 3751

Attachment 3752

Attachment 3753

Attachment 3754
Have you tried flipping the float over? I've seen them installed upside down many times.
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  #71  
Old 12-19-2013, 12:57 PM
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Thanks for the reply. I have not only because all of the pictures that I'm seeing are similar to how I have it and how it was when it came apart (not saying that is definitely the correct way). The pictures that I've posted show the float installed. Can anyone confirm that this is correct?

---------- Post added at 02:57 PM ---------- Previous post was at 02:43 PM ----------

I've confirmed. It has been installed correctly and not upside down. Any other ideas/help?
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  #72  
Old 12-19-2013, 01:10 PM
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Is the needle and seat worn? If the float is installed correctly (which you confirmed) the tang on the float usually only needs a slight bend in it to close the needle valve and achieve proper float height.
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  #73  
Old 12-19-2013, 01:41 PM
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You sure you running the right spec?
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  #74  
Old 12-20-2013, 04:48 PM
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Alright, Stupid question: I have a Keihin PWK swapped onto my 02 CR250 (came with Mikuni TMX) In the manual for a 99 CR250 (pwk equipped), it says the float height should be at 16mm. The manual for my 02 says set the float at 15mm. Are these recommendations more carb specific or bike specific? Also what causes the float height to get out of spec? Wear and use? I ask because my PWK only has a few hours of use on it so I'm wondering if it would even need setting. (It's currently in the garage soaking in cleaner so I haven't measured it yet.)
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  #75  
Old 03-10-2016, 05:54 PM
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you have explained this extremely well and I am very grateful! I know nothing about these things and I dont want to take my bike in, so this helps even a newbie and layman like me! thank you!
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