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Post by grimsby53 on Dec 21, 2010 16:26:53 GMT -5
I put the 5g sliders in today, and the procedure went well. Mostly (I seem to have cocked up the kick-start engagement-- the lever is too high now and won't engage-- eh, I'll fix it later). The how-to's here were very helpful. I picked the 5g weights based on others' comments here. I'm about 150 lbs (or 160 around the holidays). As for results, I was honestly hoping for more. She pulls a little harder off the line, but it's more noticeable in the 30-40mph range. There she pulls a lot stronger. But the top speed isn't any better. It might have decreased slightly  There was this one section of my drive with a nice little downhill that let her get up above 45mph, then the road leveled out, and she held that speed just fine until I had to brake for a light. I noticed this behavior before changing weights too. It makes me think she just doesn't have the power to get on top of that maximum ratio, and that's holding the engine rpms down, possibly below peak power. I'm not sure what to do about that except add more power. I do like the way she's driving now, but the speed is just too low... What's next? |
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Post by grimsby53 on Dec 21, 2010 16:29:09 GMT -5
 This is after I had it all put back together. There's noticeable bluing on the clutch bell. Should I be doing something to fix that? Could my clutch need attention too? |
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Post by 90GTVert on Dec 21, 2010 17:12:43 GMT -5
It sounds like a good upgrade to me. One thing I can't stress enough about tuning is that you absolutely cannot expect someone to recommend one weight or one jet or whatever and have it work perfect for you. Sometimes it does, but there are other factors in play like rider weight, riding style, rider preference, etc... I could probably tune one of my scoots perfect for me and someone else may hop on and say they'd like it to rev a little less cruising or respond a little faster or...
I believe your assessment to be correct, that you need more power to maintain the higher speeds. There's no replacement for displacement. A big bore kit would be my choice for a power boost.
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Post by grimsby53 on Dec 22, 2010 10:51:41 GMT -5
Coming from the world of sports car tuning, I know very well what you mean. Everyone on 'net wants to know exactly how much power a given set of parts will add up to, as if it's "5 hp for the intake + 7 more for the exhaust + 6hp for every pound of boost = 24hp!" Of course that sort of math is ridiculous, and everyone is wrong on the internet. A machine is more (or sometimes less) than the sum of its parts. I've seen 2 supposedly identical completely stock cars come in over 20 whp apart on the same dyno on the same day.
I'm not sure if my scoot got the "Tuesday motor," if you know what I mean.
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Post by 90GTVert on Dec 22, 2010 11:22:02 GMT -5
lol Yeah. If it worked the way some folks seem to think, you'd just put a 500 shot of nitrous on every vehicle and call it done.  I wish it did work like that. Would be crazy to have a scoot with 503HP for the cost of a nitrous kit and some big jets. lol |
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Post by Fox on Dec 22, 2010 13:57:31 GMT -5
You obviously were under the impression that the lighter weights would increase top speed when they don't. They only increase the acceleration rate some.
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Post by Goosey on Dec 22, 2010 16:56:26 GMT -5
Like Fox said, lighter weights will improve take off, as you found out, and help maintain speed going up hill. It won't improve top speed. Sliders will smooth things out a bit compared to rollers.
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Post by grimsby53 on Dec 23, 2010 0:32:20 GMT -5
Well it never did make sense to me why they would change the top speed, but then many sources (including the manufacturer ) claimed that they would. So I was just hoping... Now I know. It's still a good mod, for the extra pep in the mid-range.
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Post by 90GTVert on Dec 23, 2010 5:24:00 GMT -5
Lighter weights would increase cruising speeds more likely than top speed in most cases. Getting in the right powerband can help the scoot struggle less and maintain higher speeds. Being a big guy, lighter (4.5g) sliders helped me make it to 50MPH on my 4T. I needed to stay right in the peak power to get to that speed. There was also a lot of other CVT tuning involved to make it all work though.
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Post by grimsby53 on Dec 23, 2010 18:41:01 GMT -5
I think I'lll be trying the BBK and exhaust soon. But should I try some other CVT tuning first? Clutch/contra spring? Lightening... things? Mods to cool the tranny better?
Or should I go for the extra power first, then tune the CVT to match. That actually makes sense to me. No sense getting the CVT all in-tune with a motor that I'm about to drastically change.
I think as an intermediate step though, before I drop the cash on the $$ engine parts, I'll change out the coil, plug, and maybe try one of those performance CDI's. Are they all basically the same?
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Post by 90GTVert on Dec 23, 2010 20:05:47 GMT -5
You can do the CVT cooling mods for free if you have tools. I'd definitely do some sort of venting... 49ccscoot.proboards.com/index.cgi?board=transtech&action=display&thread=360I also believe you would be better off to do the BBK and then tune the CVT to match. Some CDIs do essentially nothing more than remove the rev limiter, if your scooter even has one to begin with. Others really do have either a different timing curve or simply adjust the base timing. I never mess with CDIs on any of my scoots. I just keep the stocker and if I really feel the need for a slight boost I'll mod the pickup so I can move it and change the base timing a few degrees. The more you advance it, the less compression it can take and the more octane it needs though. |
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Post by grimsby53 on Dec 24, 2010 12:43:21 GMT -5
Well so far I haven't found a single local petrol station with a dedicated premium fuel hose, so unless I fill up behind someone in a BMW I'm probably getting a gallon of regular no matter which button I push. So mods to push the timing are probably not a good move.
I think I'll freshen up the ignition, do intake & exhaust, then re-jet to match. At that point I'll know if a bbk is a must or not, and if I go that route anyway, it should work great with the other parts. Does anyone sell a nice intake kit with a k&n style filter (I'm not a believer in foam filters )? Or do people bodge together their own? I might go that route anyway- seems easy enough.
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Post by lshigham on Dec 24, 2010 13:03:32 GMT -5
Well so far I haven't found a single local petrol station with a dedicated premium fuel hose, so unless I fill up behind someone in a BMW I'm probably getting a gallon of regular no matter which button I push. So mods to push the timing are probably not a good move. I think I'll freshen up the ignition, do intake & exhaust, then re-jet to match. At that point I'll know if a bbk is a must or not, and if I go that route anyway, it should work great with the other parts. Does anyone sell a nice intake kit with a k&n style filter (I'm not a believer in foam filters )? Or do people bodge together their own? I might go that route anyway- seems easy enough. Does the hose really hold that much? I wouldn't have thought more than a quart would be left in there. |
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jimh
Scoot Enthusiast
Posts: 198
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Post by jimh on Dec 24, 2010 19:16:37 GMT -5
I'm skeptical on the whole dedicated hose issue myself...a couple of ounces at most is my guess. If you're unsure of how much premium you're really getting, add a cap full of octane booster to your tank. Just a suggestion...
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Post by 90GTVert on Dec 24, 2010 19:28:35 GMT -5
Does anyone sell a nice intake kit with a k&n style filter (I'm not a believer in foam filters )? Or do people bodge together their own? I might go that route anyway- seems easy enough. A K&N breather filter for a car with an ID of 1.5" should clamp on the carb pretty easily. |
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I wish it did work like that. Would be crazy to have a scoot with 503HP for the cost of a nitrous kit and some big jets. lol
