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Post by bvulic1 on Apr 30, 2018 9:35:11 GMT -5
I have a pre-bug 2001 cw50 Zuma. I went through the carb, new plug, have fresh gas and have a new clean filter in the stock air box. The scooter will start first kick while giving it full throttle. Once it starts, it runs very well and idles well. The initial acceleration is great and will scoot up to its top speed of 36mph very easily.
The problem I am having is that there is a weird inconsistency in the scooter at half throttle. at some points randomly during my ride, If I am riding at say 30mph, and let off the throttle, and re-throttle it up I will get what feels like bogging in the mid range. It'll slow down to a point where its constantly bogging when throttling. If I hold the throttle at the max, it will bog for a few seconds and then roar right back to life and go.
I understand that the needle is responsible for 1/4-3/4 throttle, so I attempted to richen up the needle by moving it one notch down, and it was fine fr a little while but then came back randomly during a ride.
I appreciate your help on this, not really sure where to go.
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Post by benji on Apr 30, 2018 9:42:13 GMT -5
Clogged muffler maybe
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Post by bvulic1 on Apr 30, 2018 10:01:44 GMT -5
Your input is appreciated. That is a true possibility. Now that you mention that, I do remember hearing sort of a psssttt sound coming from the exhaust area while riding. Again, nothing consistent, but i'd hear it every now and then. In theory, taking the exhaust off and trying to run it for testing purposes will more than likely not allow enough back pressure to run well correct? How do I go about clearing out this exhaust?
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Post by bvulic1 on Apr 30, 2018 13:28:59 GMT -5
Would a clogged muffler in this scenario cause only the mid throttle (1/4-3/4) to bog/hesitate? As I stated, the starting seems okay, granted I need to twist full throttle to have it start. After that, it idles well and full throttle works well.
Any help is appreciated! Interested in what to do next.
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Post by benji on Apr 30, 2018 14:40:03 GMT -5
Do not attempt to run it w/o a muffler. If it runs it can damage itself.
If it's clogged the easiest thing to do is replace it. You can "burn out' the clog but that can be dangerous since it's an enclosed space w fuel and carbon and whatnot (bomb). Of your doing upgrades i would do a pipe anyway, but if not then a replacement should be cheap.
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Post by bvulic1 on Apr 30, 2018 16:20:41 GMT -5
Anything else you can think of that would cause this issue? Other than a clogged exhaust? It seems like there are too few miles for an exhaust clog. (3200)
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Post by repherence2 on Apr 30, 2018 20:53:48 GMT -5
It could be an issue with your rear pulley /torque drive. If your rear pulley has the dual angle slots versus single angle slots. My chinarelli came with dual angle slots and the motor would strain/bog during the transition between the dual angles. I swapped out my rear pulley /torque drive for a pulley that has single angle slots.
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derek420
Scoot Member
Ready to Ride!
Posts: 33
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Post by derek420 on May 1, 2018 1:16:56 GMT -5
a clogged pipe would make you low on power slow top speed etc, id say dirty carb take a piece of wire to the jets and holes sometimes the carb looks clean but the slightest piece of crud can make it run like pooh the pieces make break free than block the flow again its possible or maybe your cdi is acting up? It can make it bog or even backfire or run erratic.
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Post by benji on May 1, 2018 8:40:10 GMT -5
My jog had a clogged pipe at 4500 miles. The gas n oil can 'mix' w the dirt and moisture from the outside air, especially if it sits outside. Then when you ride it, the goop inside melts and starts clogging/unclogging the pipe at random intervals.
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Post by bvulic1 on May 1, 2018 8:40:33 GMT -5
I was determined to figure it out and for some reason didn't think the exhaust was in fact clogged since it only has 3000 miles, so I went back and returned the main jet needle to the middle notch to begin with. The problem seemed to be a very rich mixture (realized after pulling the plug) and also the intake boot was not too tight to the port on the carb.The tightening screw was not very tight at all, I was able to wiggle the carb while it was connected to the intake.
I tightened that up and took it for a 6 mile ride, all seems well. The bog is non-existent. I appreciate everyone's insight!
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Post by bvulic1 on May 7, 2018 11:16:30 GMT -5
I was determined to figure it out and for some reason didn't think the exhaust was in fact clogged since it only has 3000 miles, so I went back and returned the main jet needle to the middle notch to begin with. The problem seemed to be a very rich mixture (realized after pulling the plug) and also the intake boot was not too tight to the port on the carb.The tightening screw was not very tight at all, I was able to wiggle the carb while it was connected to the intake. I tightened that up and took it for a 6 mile ride, all seems well. The bog is non-existent. I appreciate everyone's insight! I take this comment back completely. I had taken the scooter out for about a 6 mile round trip ride and noticed the same issue creep up on me. This time, i started off fine, I went to fill gas and shortly after that, I noticed the issue happening again. From what i gathered per my observations, this inconsistency happens either A. after filling up or B. after hitting some potholes/bumps in the road. Its weird, i will hit a few bumps and I will feel some hesitance and then it begins to bog/stumble its hard to tell which. It'll start without issue but ill have to play with the throttle to keep it running.
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Post by triumphmad on May 8, 2018 1:16:20 GMT -5
I’m having the very same problem on my Peugeot Blaster & am also hunting for a cure. I may swap out my cdi next & try that.
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Post by ThaiGyro on May 8, 2018 2:54:13 GMT -5
Hey bvulic1...it may be you are experiencing more than one issue. I would go back to basics and do one thing at a time, so you don't confuse the issues.
Freshen up/clean up everything. Electrical connections first. Make sure the plug and wire and timing is as should be. Test--- If spark good, but hesitation not good...how is your fuel? Tank? Filter? Petcock strainer? The strainer can cause many issues. If the filter is clean, pull the petcock/strainer and look for rust, moisture, mineral deposits. Pull a sample of your fuel, put it in a small jar and let it settle. Look for particles and separation. Some scoots have no inline filter, just a tank strainer. Some have both. If the second one has issues, the first one will be worse. The issues you describe fit the above problem, in my experience. Test again---
You have done carb and intake, but make sure the above are done. Helps eliminate easy problems that are very common. I do not mind admitting...bought many bikes (cheap) that have nothing more than a plugged petcock strainer and/or shit in the gas.
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Post by triumphmad on May 8, 2018 2:57:20 GMT -5
Put on a new performance cdi & went for a quick run around the block & it went well but more testing is needed. Will ride it to work tomorrow & will update if this has fixed the problem.
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Post by bvulic1 on May 8, 2018 16:00:13 GMT -5
Hey bvulic1...it may be you are experiencing more than one issue. I would go back to basics and do one thing at a time, so you don't confuse the issues. Freshen up/clean up everything. Electrical connections first. Make sure the plug and wire and timing is as should be. Test--- If spark good, but hesitation not good...how is your fuel? Tank? Filter? Petcock strainer? The strainer can cause many issues. If the filter is clean, pull the petcock/strainer and look for rust, moisture, mineral deposits. Pull a sample of your fuel, put it in a small jar and let it settle. Look for particles and separation. Some scoots have no inline filter, just a tank strainer. Some have both. If the second one has issues, the first one will be worse. The issues you describe fit the above problem, in my experience. Test again--- You have done carb and intake, but make sure the above are done. Helps eliminate easy problems that are very common. I do not mind admitting...bought many bikes (cheap) that have nothing more than a plugged petcock strainer and/or shit in the gas. Thank you for the valuable info. To me, and to back your point here, when these symptoms creep up, it feels like after I hit bumps in the road, possible sediment deposit or flakes of rust, etc bounce around from the very bottom of the float bowl and into say the idle or main jets. That is exactly what it feels like if that makes any sense. Bogs hard and is unable to throttle without bogging and dying out eventually. I say this is possible because on this particular zuma there was no inline fuel filter so Its entirely possible that gunk from the tank reached the carb directly. After my last ride, I went out and grabbed an inline fuel filter and drained the carb bowl as well. I will see if the symptoms continue on my next ride.
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