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Post by richardthescooter3 on Aug 2, 2011 10:44:17 GMT -6
I have a 2008 Roketa 54b, I know how you feel, I've been through many problems with my scoot, my thoughts are the throttle, you can make adjustments to your throttle to give it more gas when you need it, and check your air filter, it clean make sure its sealed right.
Rich
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Post by damin69 on Aug 21, 2011 16:17:05 GMT -6
Ok has been a couple of nuts weeks but finally got a chance today to check compression. Compression seems to be good Up to 150 psi and seems to hold it. So I do not think it is a compression issue.
Is there a way to test the CDI?
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Sophomore
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Fear leads to anger. Anger leads to stress. Stress leads to doobies. And doobies lead to twinkies
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Post by scooteraddict on Aug 21, 2011 19:14:59 GMT -6
What size main jet are you running? Also, have you checked your float? Does it seem like its bogging, if so you might be too rich?
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Post by damin69 on Aug 21, 2011 19:37:30 GMT -6
What size main jet are you running? Also, have you checked your float? Does it seem like its bogging, if so you might be too rich? Scoot, I have no Idea what size jets are in the carb it is what ever comes stock in the carb that scrappy sells .scrappydogscooters.com/LH170MN_Linhai_257___275.html" rel="nofollow" target="_blank"> .scrappydogscooters.com/LH170MN_Linhai_257___275.htmlI have had 3 different carbs on this scooter all have done the same thing. It does not seem like a bob it just goes up to around 4700-4800 rpms under a load and stops right there. I am running A/F at 2.5 turns out from bottom. The plug when I pulled it out today is more of a dark color tip. I am thinking it should be more of a tanish grey. So I am thinking it is running a bit rich even fuel milage has only been like 50-55 mph. Pics of my Plug: new to this engine stuff so please be gentle with my ignorance.    |
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Junior
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Roketa 250 cc 54B
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Post by speedracer on Aug 22, 2011 9:20:26 GMT -6
Does anyone think there is a lot of oil on threads? The threads on my scooters plug are dry.
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Post by JR on Aug 22, 2011 13:12:25 GMT -6
A little rich but not a lot and even with that you should do better than the RPM's you're doing? Have you checked the gap on that plug? May just be my eyes but it sure looks too wide?
Also when you have had it on the stand have you done it with the CVT cover off and watched the variator and clutch in action? Reason I ask is we need to know if the belt is reacing the outer most part of the variator?
JR
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Post by damin69 on Aug 22, 2011 13:40:40 GMT -6
A little rich but not a lot and even with that you should do better than the RPM's you're doing? Have you checked the gap on that plug? May just be my eyes but it sure looks too wide? Also when you have had it on the stand have you done it with the CVT cover off and watched the variator and clutch in action? Reason I ask is we need to know if the belt is reacing the outer most part of the variator? JR No have not checked the gap on that plug. I will check it out tonight. and to question 2 yes. I have definitely made sure all CVT opens and closes the full range. That was one of the first things I did. As well as checking the rollers. |
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Post by damin69 on Aug 22, 2011 18:27:49 GMT -6
Ok The Iridium plug I took out has a .030" gap. Not sure what it should be.
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Post by JR on Aug 22, 2011 21:39:05 GMT -6
I like 0.28 but again this would not have that big of an effect if any, it just looked like it was a big gap in the picture.
This one is a tough one going to have to think on it for a bit?
JR
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Post by damin69 on Sept 1, 2011 19:59:36 GMT -6
Still no Ideas from anyone? :-(
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Post by JR on Sept 2, 2011 5:13:58 GMT -6
I'm still at a loss on this one? Changed carb, set valves, went through CVT? What about the muffler? have you checked it to make sure it's free flowing air and not restricted in any harmful way? Also not sounding harsh but you did put a 30mm carb on right?
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Post by damin69 on Sept 2, 2011 11:07:23 GMT -6
Jr,
It is actually the 32mm carb from Scrappydog for VOG260. It was the same size as the one that was on it. Muffler is brand new also, got it from scooterdynasty, ordered it on the way back from picking up the scooter down south. It does not make any sense to me either. Like I said bottom end is great it idles great but man it just a total dog when it comes to top end.
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Post by paulpaul on Sept 2, 2011 16:26:40 GMT -6
Hope you find out what is wrong. I'm having the same problem. We were riding at 65 & 70 all of a sudden it slowed to 45mph. We were 20 miles from home it runs great , idles grate , cranks grate. I'm waiting on parts. Hope to have it back running next week. I did notice when i finally lined all the timing marks up. The one on the cam side and the one by the oil check. The valves were set way loose or had loosen up. I will watch to see what you find. I will post if my is repaired this next week. If anyone knows what the roketa Yamaha clone compression should be . I was reading above the info i have says 26 to 28 setting the plug. If i getting the right info , 30 could change the timing some. I don't know if it would be enough to make a difference. Thanks Paul
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Post by JR on Sept 2, 2011 17:01:18 GMT -6
I agree and a wider gap should not have this much effect and also can give the rich color he has plus hurt the MPG. Now we've got two reported doing this? Got to get a handle on it and believe me guys I've been thinking on it even while I was mowing my yard today!
What parts have you got coming Paul? I know the VOG comes with the 32mm carb while they put the 30mm on the same engine on the 250B and IMO the 32mm carb is a waste and a advertizing gimmick. The valve port is only 30mm if its right on and the intake manifold is always smaller than the carb ID. I actually honed my manifolds out to 30mm to match the carb and polished them to have a smooth fuel/air transfer, the Chinese manifolds are very rough on the inside.
The YYP250 Service Manual lists the compression of this engine at bars and coverted its 203 psi but that is on a really tight quailty engine and most agree that the cloned engine we have is maxxed out at arounf 180 psi and anything in the 160+ range should be fine.
Again I'm still thinking on this one and we've got to figure it out.
JR
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Post by paulpaul on Sept 3, 2011 2:35:10 GMT -6
I have 14gm doc slider sliders coming a new spark plug and a new fuel filter. I decided to put new gas an vacuum lines on it. Looking at his plug ,i thought it looked close to perfect am i wrong. My plug looked about the same. I almost forgot I'm putting a new gates belt on it. Thank you JR I will check my compression. I really don't believe that there is a problem there. I can't wait to get it back together . I may be wrong but i think the valves loosened up. They we real loose. I will post what i find if anything . Jr That is a good idea . I may do my manifold the same way. If i ever take the head i will port and polish the intake an the exhaust. That will help it breath better . Thanks again Paul
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