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Post by JR on Mar 2, 2013 2:22:07 GMT -5
Truth of the matter is that nobody on this side of the Atlantic has touched that bike. So all we post here is speculation. I really think that if it is not smoking, the compression is probably good, it is running pretty well it seems.
The TwistnGo forum post you linked to refers to a bike with a windshield. As strange as it sounds windshields will make you go faster, they do improve the aerodynamics, do you have a windshield?
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Post by xylon on Mar 2, 2013 3:37:41 GMT -5
Yep I've already put 10W30 in it. No I don't have a windshield.
I'll get some seafoam to clean the injectors, and maybe get the equipment to do a compression test when I have time.
Thanks for your thoughts everyone.
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Post by JR on Mar 2, 2013 8:51:23 GMT -5
It seems you are on the right track for sure and now that you are giving this scooter some good care hopefully it'll run for days to come. There are little things you can do to get 1 or 2 MPH here and there and they do add up. Since you seem to be on a solid threshold of 60 to 62 MPH I would say the scooter still has some spunk to it and as mentioned the poor PM in the past and the 15k in miles hasn't helped it.
The seafoam for sure will not cause any problems and is just another good PM thing for engines and will clean it up if there is any fuel residue. After that again a roller weight change may get a couple more MPH and even possibly a performance variator can help.
As I stated before this is a nice scooter, wish they sold them here.
JR
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Post by terrilee on Mar 2, 2013 8:58:04 GMT -5
would taller gears give him any more speed?
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Post by earlwb on Mar 2, 2013 9:57:59 GMT -5
Well actually a CVT belt that was a little longer might do it as a longer belt changes the gear ratio. That is a problem with the Chinese 250cc scooters a lot, as they may have more than one belt length that was used on the scooters. There can be a issue with having too tall of a gear ratio that takes the engine out of its best powerband which results in the engine not being able to pull the higher gear and thus it runs slower then. A good example is some guys putting on huge oversize wheels and tires on their 4x4 vehicle, but the engine doesn't have the power to pull the vehicle as it would with smaller wheels and tires.
One other thought is altitude can affect performance. Someone in Denver, Colorado at 5,600 feet elevation is not going to be able to go as fast as someone in Los Angeles California at 200 feet elevation. As mentioned already most speed measurements for advertising are done at sea level and when weather conditions are ideal (tailwinds?). Also weight can be a big issue, a big heavy fellow will never go as fast as a small person on the same scooter. The sitting upgright will cause a lot more drag than being tucked down in a racing position. The rear tire being worn down can affect the top end as the tire's circumference gets more small as it wears down. Thus a new tire on the scooter can yield a higher top speed than when the tire is worn out.
Then changing the variator weights was a mod some people did too. Using more light weights results in better acceleration around town but slows the top end down a little. Heavier weights can reduce accelleration but improve the top end a little more. The variator may not close up as much at high speed resulting in a lower gear ratio. This is actually a pretty common modification done to scooters for around town riding and where it is more hilly too.
Then of course if the engine has 15000 miles on it and was poorly taken care of as well, it just may be worn and tired and not capable of going as fast as before. The compression could be a little less, valves leaking a little bit, et cetera.
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Post by prodigit on Mar 2, 2013 20:21:21 GMT -5
other than all the above, just make sure you have a free flow air intake and exhaust, no limited CDI (put on center stand and see if the engine revs to ~10+k RPM's), and see if the bike has the correct jet size. Most of the time these bikes are running lean on high RPM's, and adding a larger main jet size, could get you more top end power, but could also drastically decrease MPG's.
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Post by JR on Mar 3, 2013 8:10:39 GMT -5
Well actually a CVT belt that was a little longer might do it as a longer belt changes the gear ratio. That is a problem with the Chinese 250cc scooters a lot, as they may have more than one belt length that was used on the scooters. There can be a issue with having too tall of a gear ratio that takes the engine out of its best powerband which results in the engine not being able to pull the higher gear and thus it runs slower then. A good example is some guys putting on huge oversize wheels and tires on their 4x4 vehicle, but the engine doesn't have the power to pull the vehicle as it would with smaller wheels and tires. One other thought is altitude can affect performance. Someone in Denver, Colorado at 5,600 feet elevation is not going to be able to go as fast as someone in Los Angeles California at 200 feet elevation. As mentioned already most speed measurements for advertising are done at sea level and when weather conditions are ideal (tailwinds?). Also weight can be a big issue, a big heavy fellow will never go as fast as a small person on the same scooter. The sitting upgright will cause a lot more drag than being tucked down in a racing position. The rear tire being worn down can affect the top end as the tire's circumference gets more small as it wears down. Thus a new tire on the scooter can yield a higher top speed than when the tire is worn out. Then changing the variator weights was a mod some people did too. Using more light weights results in better acceleration around town but slows the top end down a little. Heavier weights can reduce accelleration but improve the top end a little more. The variator may not close up as much at high speed resulting in a lower gear ratio. This is actually a pretty common modification done to scooters for around town riding and where it is more hilly too. Then of course if the engine has 15000 miles on it and was poorly taken care of as well, it just may be worn and tired and not capable of going as fast as before. The compression could be a little less, valves leaking a little bit, et cetera. All these things you mentioned are right on Earl but the 150 Scooters have the belt difference too. One can put a 835 and a 842 on the long case 150 and even custom order a 846. But on the roller weight change one can actually get in the middle with slider and hold take off RPM's and gain top end at the same time just by their design, have done this on numerous scooters fro 50cc to my own 250's. Generally speaking one can drop one weight size from the original roller weight with sliders and never notice any change on take off and gain 1 to 3 MPH on tope end by changing to sliders alone. His altitude is just a little above sea level and this actually hurts him a little, best altitude range is about 1k to 1k above sea level. He did mention that he adjusted the valves and hopefully they are still seating well if not then he's losing compression some but most of the time even just a slightly poor seating valve has a very noticeable affect on the engine. JR |
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Post by JR on Mar 3, 2013 8:20:52 GMT -5
other than all the above, just make sure you have a free flow air intake and exhaust, no limited CDI (put on center stand and see if the engine revs to ~10+k RPM's), and see if the bike has the correct jet size. Most of the time these bikes are running lean on high RPM's, and adding a larger main jet size, could get you more top end power, but could also drastically decrease MPG's. This does apply to carb scooters but again this is a EFI system and superior to a GY-6 carb setup and one doesn't dare mess with the airflow on this scooter. Again as mentioned this scooter already has a advanced timing system again superior to a GY-6 ignition system. CDI advance with buying a lot of the so called tunable CDI's in lots of cases is a waste of $$$ and does nothing for the engine, in some cases I've had people have problems starting their scooter with this type of CDI and it's because the CDI does not actually advance from a lower RPM when starting to a higher RPM when revving the engine. They have been making improvements with them and Tvnacman has a CDI that he has tested and knows it does work by his tests and Alley has also found a good one as well. For the most part these CDI's are for the people who race and are wanting to reach a high RPM quickly but high RPM's on the everyday wanting to ride scooter ends up being a short lived engine. The Standard CDI will accomplish all the top end the scooter was designed to do and do just fine. JR |
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Post by JR on Mar 3, 2013 14:37:16 GMT -5
Guys I will bet that he just needs the windshield and the bike is fine.
Every post I have ever seen on before and after a windshield they report a pick up of a few miles per hour. wind hitting the body is much worse than wind hitting a windshield.
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Post by scootnwinn on Mar 5, 2013 16:45:09 GMT -5
Guys I will bet that he just needs the windshield and the bike is fine. Every post I have ever seen on before and after a windshield they report a pick up of a few miles per hour. wind hitting the body is much worse than wind hitting a windshield. +1 or in this case it could be +5 |
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Post by alleyoop on Mar 8, 2013 23:36:30 GMT -5
Yes a windshield would help the cause, sitting on the scoot you body take a lot of air you see the racing bikes all bent over with small windshield so the air goes over them.
Alleyoopi
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Post by JR on Apr 5, 2013 0:19:51 GMT -5
I friend of mine sold his Kymco 150 that would go over 70 on a good day and he bought the 150 version of this Honda and it will not go over 62 mph. You may not be able to get it going faster.
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Post by prodigit on Apr 5, 2013 0:31:07 GMT -5
Completely forgot to mention a valve adjustment!
I suppose at 15k miles, it needs to be checked!
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Post by xylon on Apr 5, 2013 5:04:40 GMT -5
Doug: hm OK that's encouraging. I don't actually need more top speed it's more just that I was worried there was something wrong with it. But are your sure it was a PS150 rather than a PCX150? They're very different models.
prodigit: yeah adjust the valves was one of the first things I did when I got it.
This morning I put some fuel injector cleaner in the tank. It smells bad but hopefully it will clean up the engine a bit. Yesterday I sniffed some superglue and now I sniff this, arg.
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Post by xylon on May 19, 2014 5:51:01 GMT -5
Over a year later I have finally solved this problem. The back tire the dealer put on the scooter was WRONG. Too low profile. Obviously this effectively reduced the gear ratio of the scooter. I just fitted the correct tire and now it can do 69 speedo indicated.
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..BAD TO THE BONE..