Runaway CRF50 - Honda Motorcycles - FireBlades.org
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post #1 of 8 Old 08-03-2017, 11:23 AM Thread Starter
 
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Runaway CRF50

I bought a CRF50 (4-stroke) to transition my 4-yo son from the (2-stroke) PW50 that he'd been previously on. It threw him off twice skidding in turns and he's since been tentative but willing to ride it. I'm thankful for that. But I made a parental decision and glad I made it.

I negotiated $50 off for the throttle not snapping back. A $12 Amazon part that didn't fit, 2 weeks at the shop, a new rear inner tube, the shop owner's throttle cable and $150 from my pocket the bike came back home last night. A long way to get to this point, but we're here.

We woke at 6a to get out before the day got too hot and he had his first ride. He rode for about a good 45 mins and went home with a WIN in his pocket. I was able to progressively turn the throttle screw out to give him more range and he was gratified and his confidence continued.

Unfortunately, the condition that I wanted to prevent still occurred. I asked him to stop in front of me (yes, I ask for certain level of precision with putting the bike in specific spots) he couldn't do it. I noticed the bike continued to walk unless he was on the rear brake. I checked the throttle it was still snapping back and even my forcing it forward didn't cure the condition. It seems to be tied to a well-warmed engine, which is FINE when we're running drills but overall is bad.

The bike seems to idle very low, as it should so I don't think that's the problem.

I have a tentative appointment to take it to another shop later today and would love to save the trip, but I'll go if necessary.

What do you guys think?
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post #2 of 8 Old 08-03-2017, 12:57 PM
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Re: Runaway CRF50

Quote:
Originally Posted by Jaybird180 View Post
I bought a CRF50 (4-stroke) to transition my 4-yo son from the (2-stroke) PW50 that he'd been previously on. It threw him off twice skidding in turns and he's since been tentative but willing to ride it. I'm thankful for that. But I made a parental decision and glad I made it.

I negotiated $50 off for the throttle not snapping back. A $12 Amazon part that didn't fit, 2 weeks at the shop, a new rear inner tube, the shop owner's throttle cable and $150 from my pocket the bike came back home last night. A long way to get to this point, but we're here.

We woke at 6a to get out before the day got too hot and he had his first ride. He rode for about a good 45 mins and went home with a WIN in his pocket. I was able to progressively turn the throttle screw out to give him more range and he was gratified and his confidence continued.

Unfortunately, the condition that I wanted to prevent still occurred. I asked him to stop in front of me (yes, I ask for certain level of precision with putting the bike in specific spots) he couldn't do it. I noticed the bike continued to walk unless he was on the rear brake. I checked the throttle it was still snapping back and even my forcing it forward didn't cure the condition. It seems to be tied to a well-warmed engine, which is FINE when we're running drills but overall is bad.

The bike seems to idle very low, as it should so I don't think that's the problem.

I have a tentative appointment to take it to another shop later today and would love to save the trip, but I'll go if necessary.

What do you guys think?
Hi Jay , could be clutch adjustment or wrong engine oil (viscosity)
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post #3 of 8 Old 08-03-2017, 3:09 PM
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Re: Runaway CRF50

The clutch is centrifugal, and as we know is usually engaged by increased rpm. If the idle is too high it engages too early, if too low, it takes more rpm to engage it. I'm pretty sure there is an adjustment for free play in the set up.

That's all based on your post, if I'm reading it correctly, that it creeps, with no throttle input.

It might need to be taken apart and checked out.
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post #4 of 8 Old 08-03-2017, 4:21 PM
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Re: Runaway CRF50

Hi Jay, just a little info from the manual, don't know if you've already tried this
Attached Thumbnails
clutch.PNG‎  
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post #5 of 8 Old 08-03-2017, 4:35 PM Thread Starter
 
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Re: Runaway CRF50

Ya know, the thought had occurred to me that I'd better get familiar with the manual. My first read was this morning as I scrambled through it to find out how to start it and operate the shifter mechanism. smh.
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-Her 02 CBR600F4i Custom Suspension
-My 07 CRF230F sold
-My 97 XR100
-07 CRF50F son's
-92 CB750 She lets me ride it, Jetted
-13 CRF110F, 01XR50 Daughter's

Because 12,000 RPM makes me feel better
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post #6 of 8 Old 08-04-2017, 1:47 PM
 
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Re: Runaway CRF50

Service Manual - my bible and savior! And of course, this forum.
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post #7 of 8 Old 09-26-2017, 9:57 AM Thread Starter
 
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Re: Runaway CRF50

Well, I've taken the bike to a mechanic that's trusted and he found a tight valve. He said that as the bike heats up the valve gets tighter making the problem worse/ more apparent.

But one of the main issues is that the crankcase oil was overfilled and a carb needle needed replacement. It's much better now. He said I MIGHT have to adjust the idle screw. I haven't done that yet.

My son rode it the other day and it got up to full temperature and we were able to put it on the sidestand and it barely moved while running.
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-My 06 Fireblade Build Thread
-Her 02 CBR600F4i Custom Suspension
-My 07 CRF230F sold
-My 97 XR100
-07 CRF50F son's
-92 CB750 She lets me ride it, Jetted
-13 CRF110F, 01XR50 Daughter's

Because 12,000 RPM makes me feel better
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post #8 of 8 Old 09-28-2017, 9:32 AM
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Re: Runaway CRF50

Quote:
Originally Posted by Jaybird180 View Post
Well, I've taken the bike to a mechanic that's trusted and he found a tight valve. He said that as the bike heats up the valve gets tighter making the problem worse/ more apparent.

But one of the main issues is that the crankcase oil was overfilled and a carb needle needed replacement. It's much better now. He said I MIGHT have to adjust the idle screw. I haven't done that yet.

My son rode it the other day and it got up to full temperature and we were able to put it on the sidestand and it barely moved while running.
Well now, that's some interesting information. Glad it's sorted out!

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