Topic: CRF150F maintenance  (Read 2745 times)

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Offline 2smoke

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« Reply #15 on: June 11, 2016, 12:26:59 PM »
Darn! I ordered a kit for the 185. It had everything but the O ring way up inside around the main jet. Orielly auto parts matched it perfectly

Offline Joe Shimano

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« Reply #16 on: June 11, 2016, 02:40:16 PM »
keep your fingers crossed

Pulled the carb and recleaned.  Gave the float a 'tweak' and so far it hasn't  leaked.



crap, crap, crap.  Road around this afternoon and it started leaking again....
« Last Edit: June 11, 2016, 06:27:02 PM by Joe Shimano »

Offline bblass

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« Reply #17 on: June 13, 2016, 08:24:02 AM »
Have you tried giving the side of the bowl a little percussive maintenance when it starts to overflow? I've got a ttr-225 that does that from time to time. A couple of gentle whacks to the side usually fixes the issue.

Probably a bur or something on the dowel that connects the float to the needle valve.

Offline Joe Shimano

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« Reply #18 on: June 13, 2016, 09:21:41 AM »
Have you tried giving the side of the bowl a little percussive maintenance when it starts to overflow? I've got a ttr-225 that does that from time to time. A couple of gentle whacks to the side usually fixes the issue.

Probably a bur or something on the dowel that connects the float to the needle valve.

Nope. But will try. Shopping for new jets and probably rebuild kit this week



Thanks for the tip

Offline Joe Shimano

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« Reply #19 on: June 16, 2016, 03:44:54 PM »
I may need professional help on this.  Rejetted with 42 slow and 105 main. Ran awful
Still leaking out over flow.  And to top it off I tore the fuel line taking it off.


Having a beer and calling it a day

Offline Postmaster

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« Reply #20 on: June 16, 2016, 09:33:00 PM »
Here is a thought.  When I rebuilt my 78 CX 500, I had the same problem.  Drove me crazy for about two weeks.  I finally found the problem.  Fuel was NOT leaking out of the top of the overflow tube, but instead it was leaking close to the bottom of the overflow tube.  The overflow tube was cracked.  Here is how I found it.  Take the bowl off of the carb and sit it as level as you can.  Fill the bowl up with gas, not any other liquid, almost to the top of the over flow tube.  Check the level of the fuel every few hours or the next day.  When I did this, the fuel had dropped to a certain level then stopped.  It took a magnifying glass to find the crack, but it was there. 

The overflow tube on the CX was pressed into the bowl and was not replaceable.  I used solder and tried to fix it.   Didn't work real well, so I bought a used bowl off eBay.  Did the same test on the eBay bowl, no leaks.  Replaced the bowl, no more leak.

Might not be your problem, but it is another thing to check.   

Offline Joe Shimano

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« Reply #21 on: June 17, 2016, 06:43:55 AM »
Won't hurt to test it. Thanks


Going to pick up some small clear tubing to put on the overflow tube and see if I can find the fuel level in the bowl

Offline matthew.j.riley1

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« Reply #22 on: June 17, 2016, 11:56:59 AM »
Check the seat on the float valve. It could be leaking past if its seal is damaged or gunked up. +1 on the overflow tube too.

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Offline SpeedyR

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« Reply #23 on: June 17, 2016, 06:18:37 PM »
and make sure you have the fuel/vent lines correct. i chased around an overflowing float bowl an extra day before I figured out I had put the hoses back in the wrong order. lol.


Offline kdtrull

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« Reply #24 on: June 17, 2016, 07:37:38 PM »
Won't hurt to test it. Thanks


Going to pick up some small clear tubing to put on the overflow tube and see if I can find the fuel level in the bowl

Great idea with the tygon tubing sight glass!



Is that what you're thinking???

Offline Joe Shimano

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« Reply #25 on: June 18, 2016, 06:49:06 AM »
Won't hurt to test it. Thanks


Going to pick up some small clear tubing to put on the overflow tube and see if I can find the fuel level in the bowl

Great idea with the tygon tubing sight glass!




Is that what you're thinking???



That's it

Offline Joe Shimano

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« Reply #26 on: June 18, 2016, 01:30:33 PM »


CRAP. That new float valve didn't help at all

Offline griff

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« Reply #27 on: June 19, 2016, 08:04:59 AM »
I've had this issue with several CRF's. One ended up having a float that didn't float. Next time your messing with it, take the float out and put it in a cut of gasoline. Leave it for a few hours. Mine would sink after a while.
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Offline Joe Shimano

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« Reply #28 on: June 20, 2016, 06:40:00 PM »
Have you tried giving the side of the bowl a little percussive maintenance when it starts to overflow? I've got a ttr-225 that does that from time to time. A couple of gentle whacks to the side usually fixes the issue.

Probably a bur or something on the dowel that connects the float to the needle valve.



This was it I believe.  Gave it some tough love with a screwdriver handle and it stopped. 

Offline bblass

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« Reply #29 on: June 20, 2016, 06:44:02 PM »
Have you tried giving the side of the bowl a little percussive maintenance when it starts to overflow? I've got a ttr-225 that does that from time to time. A couple of gentle whacks to the side usually fixes the issue.

Probably a bur or something on the dowel that connects the float to the needle valve.



This was it I believe.  Gave it some tough love with a screwdriver handle and it stopped.
If there was one thing I learned in the army it was that hitting the offending object will solve 90% of its issues and has the added benefit of making you feel immensely better