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Post by duosport on Jun 5, 2010 17:52:20 GMT -5
This is not some error on my part. This is a faulty guage.
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Post by duosport on Jun 6, 2010 9:31:23 GMT -5
I hope I do not sound abrupt or defensive. If I do I apologize. I am very frustrated with this whole thing. I do appreciate everyone's advice here. Thank you.
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Post by duosport on Jun 6, 2010 11:04:41 GMT -5
OK so I pulled the manifold off and checked out the reeds. What a hassle this turned out to be. I had two hex head bolt and two "star" shaped bolts. I removed the hex hed bolts OK, but the other fasteners had very small inset "stars" I had the correct screw driver head to fit them. But it is just a screw driver. The bolts were all really cranked on tight. The "star" bolts instantly striped out the top inset part. I do not know why these two types of bolts were on there. I tried using a screw extractor. No success with that, so I simply drilled them out and tried to be careful not to ruin the plastic manifold. I managed to drill them out and not damage the manifold too badly.
The reeds are the original steel ones. they are in excellent shape. I even put the cage to my mouth and sucked in. there was no air comming through when I did that. Not very scientific but still. I do not think the reeds are the problem.
What I seem to have is very little engine rev. The engine just does not seem to rev high. Next I will open up and look at the belt and variator. What else could be the issue? Sorry but I do not have the cash to buy a pressure tester unit right now.
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Post by duosport on Jun 6, 2010 11:08:54 GMT -5
... Now, there are 10 pages here, so what exactly were the symptoms again so I don't have to read this whole thread again. Other than feeling weak, does it surge at idle, or anything else fishy? It does not surge at idle but when I rev the engine up on the main stand, it then runs fast without dying down. If I hit the brake and stop the rear wheel from spinning then the idle cuts down and it wants to bog out. |
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Post by stepthrutuner on Jun 6, 2010 11:27:05 GMT -5
Kinda sounds lean to me. When you cleaned the carb did you remove all jets and idle mix screw? Did you squirt out all passages both ways?
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Post by duosport on Jun 6, 2010 12:08:03 GMT -5
 This is the fourth time I have torn apart the carb and cleaned it. I removed the main jet and cleaned it with carb cleaner and a wire then soaked it. The body of the the carb I sprayed into every passage. The idle jet is press fit into the Gurtner carb and I cleaned that as best I could in place. As far as the idle and mixture screw this time I have not spent any time hardly messing with it. I turned out the misture screw 2 turns and went from there a bit. the other three times I have cleaned out the carb I did an extensive tuning of the mixture and idle screws, none which yelded an significant change in performance.
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Post by 2strokd on Jun 6, 2010 15:40:57 GMT -5
Check that cvt system out, you might be surprised if that was the problem the whole time and it wouldnt surprise me one bit if there lies the problem. If its dirty, worn, and or you have flatspotted rollers, or all of these (will be IMO if the cover hasnt been of) you WILL have piss poor performance out of any scooter. Hope you have or can get a impact, air or electric. Take the cover off and use the impact to get the vari off. Take a look at all that messy belt dust and dirt! Now look at how bad those rollers look(i hope not but could be?)! Ewww, what a mess, no wonder my scooter wont run good! Now clean it all up real good, check your belt width etc. Replace the belt and rollers if needed, then put it all back together and enjoy! Give yourself a pat on the back for trying and getting this far :cheers: ! Oh, and if the air/idle isnt set correct it can be a "pig" off idle while taking off  ! My fingers are crossed duosport ;D |
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Post by duosport on Jun 6, 2010 16:26:06 GMT -5
variatore is off and I see the rollers have flat spots on them.
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Post by duosport on Jun 6, 2010 16:40:03 GMT -5
The minimum width of my belt per the owner's manual is 15.5mm My belt is 15.8mm, so I am real close to the limit.
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Post by duosport on Jun 6, 2010 16:43:35 GMT -5
So I have a belt still in spec and the weights need to be replaced but the flat spot is not real pronounced on them. I am just wondering could these render my scooter to be so slow and without power? It would seem there is something else to play here.
This is the first 2 stroke I have owned. Perhaps the lack of power I detect is simply the narrow power band that I read about. It just sounds like the engine should rev much higher.
I will get a new belt and new rollers.
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Post by duosport on Jun 6, 2010 20:06:39 GMT -5
In looking up rollers online for my Minarelli it is listed as originally having 4 gram rollers. I do not have a kitchen scale so I too the rollers to the produce section of the grocery store. The scale is not set really for such light weight. I weighed them all and divided by 6 and they came of as slightly lighter than 5 gram rollers. I guess with wear they probably were 5 gram.
As it is now I am not getting low end quickness nor high top speed. Probably the slighly flattened roller performed badly regardless of the weight. Any suggestions on the weight of new rollers?
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Post by 2strokd on Jun 7, 2010 1:23:11 GMT -5
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Post by 90GTVert on Jun 7, 2010 5:03:30 GMT -5
If you go with rollers, I'd try 4g. Sliders are a good product, but you need to buy them slightly heavier, so 4.5-5g probably as 2strokd suggested.
I'd be surprised if the lack of power you feel is just the 2Ts powerband. If it has an aftermarket pipe, they can really get narrow powerbands and be useless out of that range sometimes, but with stock pipes they aren't that bad. If you are used to 4T 50s I really can't imagine getting on a good running 2T and thinking it lacks power and revs.
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Post by duosport on Jun 7, 2010 7:52:25 GMT -5
While I wait for parts what else might be at issue?
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Post by 90GTVert on Jun 7, 2010 8:07:01 GMT -5
If there are many miles on it, it wouldn't be a bad idea to have a look in the exhaust the best you can. 2T exhausts can get clogged up over time.
Have you paid attention to the float height and main jet size when in the carb?
Check the air filter's condition.
Check the fuel lines, filter, and petcock over.
Check tire pressures and brakes for drag.
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! 