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Post by Admin on Mar 12, 2006 22:17:52 GMT -5
Dude! You are getting results. Right now, I'm doing so much with the 150cc that my 80cc isn't getting much attention. It sounds like the old fuel filter you had was restricting flow. I know you are planning an exhaust. If you check the Yahoo Geely Group, there was a brilliant guy by the name of William Longyard who built a pipe for his 150cc. I think there are some photos in a folder named "Cherry Bomb". You might email him to see if he can provide a little guidance on building a pipe.
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Post by Dave on Mar 13, 2006 15:07:13 GMT -5
Lee I did a new set of runs. I can't explane it but I am back to above 52MPH and I am turning 9200 topping out at 9400 Level run both direction timed and measured distance. Had a second person do the same runs. Not much of a change he out weights me by 20 lbs and as expected he didn't reach 52MPH but did hit 49.9 and 50.1 rpms max for him he said was 9250 on second run 9110 on first. Who-da-thought that a filter could cause so much problem. I got an email from roy last night he is hitting 62 and 8000+rpm's But thing was the dr pulley sliders 6.5gram he said then jumped excelleration a bunch and kick his top to above 60MPH- he polished ported, improved compression, has 38 and 88 jets a 150cc cam but still has the air box. Dave 'keep the rubber down and the head up"
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Post by Admin on Mar 13, 2006 15:18:39 GMT -5
Sweet. Dave, the 50/80cc is much more affected by the smallest of details. Headwind, tire pressure, etc. can have a great deal of impact on your runs. Are you going to do the Dr Pulley weights? 6.5 grams sounds perfect. I'm running three 7's and three 6's in my small scoot now.
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Post by Gave on Mar 13, 2006 20:17:43 GMT -5
Lee thanks for the cudo Yes I am. 6.5grams was your recomendation roy is running 34.5 grams but I am running runninf about 1000 rpm higher than him so I thought 37.5 was a goo number well here he comes with dr pully sliders at 6.5 how-ja-know How's the 150 coming you realy need a tack. Dave
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Post by Admin on Mar 14, 2006 9:14:13 GMT -5
I just ordered a Tiny Tach this morning. I installed that expansion chamber pipe yesterday. I'll post more on that a little later. Short story is that it isn't recommended by Dawg. Lee thanks for the cudo Yes I am. 6.5grams was your recomendation roy is running 34.5 grams but I am running runninf about 1000 rpm higher than him so I thought 37.5 was a goo number well here he comes with dr pully sliders at 6.5 how-ja-know How's the 150 coming you realy need a tack. Dave
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Post by scooterollie on Mar 14, 2006 10:26:03 GMT -5
Lee; I think you will really like the "Tiny Tach". I can send you an e-mail with a pic of where I installed mine. Looks like it came stock with it! scooterollie
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Post by riker140 on Mar 16, 2006 20:37:51 GMT -5
Lee I have not lost site of my goal which is 0 to 40 MPH in less than 10 seconds. I was thrilled to hit 10k plus. Roy thinks I was over 60MPH so does Allen who sent me a nice co do. He like me thinks these engines can reach 12k. Got real good warning from Roy at those speed the suspension can be destroyed and the frame can be twisted due to impact.
Dave
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Post by Admin on Mar 16, 2006 21:22:21 GMT -5
Not to mention that the braking system isn't designed for those kind of speeds. I would also suggest that if you are going to ride a lot at speeds over 50 mph that you might consider getting some better tires. I don't know how you are doing your 0-40 riding but I used to do that sort of stuff just running WOT. I've found that easing into WOT works better. Lee I have not lost site of my goal which is 0 to 40 MPH in less than 10 seconds. I was thrilled to hit 10k plus. Roy thinks I was over 60MPH so does Allen who sent me a nice co do. He like me thinks these engines can reach 12k. Got real good warning from Roy at those speed the suspension can be destroyed and the frame can be twisted due to impact. Dave
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Post by riker140 on Mar 18, 2006 18:38:46 GMT -5
OK! Update time: I finally got the variator off put in 3 seven gram and 3 five gram. Just took a quick check and it does seem to improve my low end. But had a meeting to go to 'free lunch china home cooked" . I will not know what my stock weight weighted until tomorrow Sunday. I have slide roller coming 6.5 grams to match Roy and Lee. Dave
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Post by Admin on Mar 19, 2006 11:02:51 GMT -5
Dave, when I tune my rollers, I go by a rule of thumb that I want to achieve a the goal of keeping the engine at the rpm's where max horsepower is generated. Depending on who's specs you read, max hp on the 50cc gy6 is at 7500-8000 rpms. Max on a 150cc is at 6500-7500 rpms. I've never seen the specs published on the 80cc. Where do you think the sweet spot is?
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Post by riker140 on Mar 19, 2006 19:27:39 GMT -5
Lee I think you have the numbers backwards the 150 would be at 7500, 8000 and the 50cc would be at 7000, 7500 the 80cc would fall somewhere in between. like 7250, 7750
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Post by Admin on Mar 19, 2006 22:45:46 GMT -5
Nope, don't have the numbers backwards at all. The larger engine will run more hp at lower rpm's. That's pretty basic. You can buy a little engraving tool that spins at 20,000 rpm's but it won't get your scooter up the hill. It's the sweet spot that we all look for when tuning rollers. It's the magic rpm/hp ratio. The problem we work with is getting accurate numbers. That is why we have to feel our way around.
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Post by medman1952 on Apr 5, 2006 11:58:20 GMT -5
Reading all this about roller weights made me want to go out today and change mine, problem is I have nothing to put in there, so I thought Hey, this should be a pretty standard thing for all those ATVs with a CVT. I went down to the only place in town that works on ATVs and asked if they had any. He looked at me like I was crazy and said I have no idea where to get them from. He was kind enough to offer help with carb jets though. Then he told me that they had made a policy of not working on "those"(chinese scooters)
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Post by Admin on Apr 6, 2006 7:59:11 GMT -5
It's really strange. So many shops won't work on Chinese scooters here in the US. There seems to be some sort of bias and a lot of misconception. I regularly look at boards in other countries and they don't have this bias. Anyway, the fact that the guy didn't have a clue about rollers just illustrates the fact that he doesn't have a clue. His lawn mower is probably Chinese!
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Post by John on Apr 11, 2006 1:31:03 GMT -5
Would anybody happen to know if the HONDA 50, XR50, CRF50 cylinder is compatible with a gy6 50cc. I found a 88cc big bore kit for one and didn't know if it would work on my 50cc scooter, Thanks
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Post by Admin on Apr 11, 2006 7:18:27 GMT -5
Can you post a pic of your engine or tell us what kind of scooter you have? What year? Would anybody happen to know if the HONDA 50, XR50, CRF50 cylinder is compatible with a gy6 50cc. I found a 88cc big bore kit for one and didn't know if it would work on my 50cc scooter, Thanks
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Post by tls2571 on May 5, 2006 22:46:29 GMT -5
I just put in my 80cc upgrade kit on Wednesday, it took me 3hrs, but it was the first time I've done anything like that. The ring came pre-installed on the piston and were gapped correctly. My boss looked at the two top compression rings and thought they might not be in the right order (top ring was black and bottom was silver ), but we left them the way they were. The new camshaft was a little bit bigger and installed that. The new head a bevel cut into it around the valves on the piston side. My boss said I would have higher compression if I used the old one, so we did. Any comments on that? I had asked about porting and he said it wouldn't help much unless I could get some bigger sized valves to put in. Are those available anywhere? I'm getting alot pinging being wide open so I guess I'd better get those jets drilled out. All in all I got 10 more mph top end (45-48mph and 52+ if I draft a bus or semi). Most of all the acceleration is great. I wouldn't mind trying some of those odd shaped roller weights if someone can tell me where to find them. All help and advice is appreciated.
Troy
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Post by Admin on May 6, 2006 12:56:47 GMT -5
I don't think those Dr Pulley rollers are available in the smaller size, yet. Your boss was right that the rings were in the wrong order. I have no clue if that will cause any problems down the road. Yep, you need to get to a larger main jet. Meanwhile, high octane fuel might help.
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Post by ooopseyesharted on May 13, 2006 17:21:59 GMT -5
Just an idiot new guy question here. I have a 2005 Geely 4 stroke 50cc scooter (GMI 104). I have ordered an 80cc bigbore kits and was wondering if all of the info in here pertains to me as well.
PS- Nice work so far dave.
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Post by karen on May 13, 2006 18:54:00 GMT -5
I am a newbie to scooters my scooter is a 49cc , my brother who is a mechanic said it had low compression 60 psi was what it read on the gauge and it runs great, it is a 4 stroke chinese scooter. I called a scooter shop and they told me 55 to 65 psi was normal for a new scooter like that and that even the larger engines like the 150cc only produced 55 to 65 psi is this correct? I would like to know if there is a problem with my new scooter.
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Post by riker140 on May 13, 2006 21:43:57 GMT -5
Karen your brother was right the comptesion is to low it should be about 140psi.
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Post by Admin on May 13, 2006 21:50:08 GMT -5
Just an idiot new guy question here. I have a 2005 Geely 4 stroke 50cc scooter (GMI 104). I have ordered an 80cc bigbore kits and was wondering if all of the info in here pertains to me as well. PS- Nice work so far dave. Hey, if you download the 80cc instructions on the dawg downloads page, that will fit you just fine. The kit those instructions are based on came from GMI. It's not difficult if you read through it a few times before you start. Go slow and be patient. Cutting corners is the wrong way to go.
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Post by ooopseyesharted on May 14, 2006 13:17:14 GMT -5
I am wondering if changing my jet to an 88 from my stock jet would make a difference when coupled with an open air filter. Anyone have an idea?
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Post by ooopseyesharted on May 14, 2006 13:18:25 GMT -5
And hey!!!! I have good karma. How does a guy go about getting some karma around here? LOL ;D
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Post by riker140 on May 14, 2006 15:30:09 GMT -5
Yes it would improve your performance and is highly recommended that you re-jet if you change to a free air filter. You can damage you motor if you run a stock jet with a free air filter.
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Post by Admin on May 14, 2006 15:50:20 GMT -5
And hey!!!! I have good karma. How does a guy go about getting some karma around here? LOL ;D There. Now you have a karma so quit bitchin'. You can hand out karmas and take them away by hitting the exhalt or smite button under the poster's name. Folks around here are pretty stingy with karma. The system limits the amount of exhalting and smiting you can do in any given time period.
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Post by ooopseyesharted on May 14, 2006 16:46:31 GMT -5
I was wondering where i could get myself a .88 jet?
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Post by Admin on May 14, 2006 17:40:28 GMT -5
Is your carb a Walbro? I would try scooterassasins.com or strokeitimports.com. Or, see if Mike at Scootertronics.com has them. Or, you can do it the poor mans way and drill it out like I did. Just remember, once you drill it, it's pretty tough to get it back to stock size! I used a #60 drill. On your speedo being whacky, you can install a bicycle speedo pretty cheap and they are very accurate if you calibrate correctly. Just don't get the wireless type. The electricals will interfere with it and it won't work.
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Post by ooopseyesharted on May 15, 2006 8:03:14 GMT -5
Thanks for the info man. I ordered a bike computer just now. I also gave my boss a downpayment on a 2006 Kymco super 9!!!!!!!! I cant wait to get it.
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Post by Admin on May 15, 2006 9:01:30 GMT -5
On the bike computer, the best way to mount the magnet to the wheel is with marine epoxy. It may take a little jury rigging to get the sensor close enough to the magnet. Congrats on the Kymco.....great bikes.
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