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Post by malerocket on Dec 13, 2010 14:42:31 GMT -5
so i drove the hell out her for 1500 miles and now its time for upgrades/maintenance. i have yet to crack the head open and adjust the valve clearances, but probably on the menu for today. anyways im looking for a suitable bbk in the 80 to 100cc range that will mate to my engine. other forums have said the p in the engine means the stroke is longer so any info would be greatly appreciated. peace powersports 50 "B09" also i have bought stiffer springs for her but cant crack the clutch nut. probably break down and buy an impact wrench. javascript:add(' :help: ')
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Post by lshigham on Dec 13, 2010 15:09:03 GMT -5
I wouldn't worry about the clutch, to be honest.
I think a change of the engine and gear oils would be a good start, perhaps followed by a valve adjust. BBK wise I'd be going for 72 or 80cc (47 or 50mm, be careful as some will round the sizes up rather a lot). There are reports that the Peace 50cc have 44mm pistons instead of the stock 40, this will make no difference when fitting a BBK.
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Post by malerocket on Dec 13, 2010 15:28:24 GMT -5
oh yea gear oil is changed once already and engine oil i change every month or more even. have had the scooter 2 seasons now. its kinda hilly here and i tend to bog down going uphill since i am not little. this scooter has already been laid down once, dropped, under 3 feet of water, and driven up and down hills at wot. after an exhaust and cdi replacement it hit about 60+ going down a long hill. maybe faster since the speedometer tops at 50 with enough room to show 55. was going so fast my eyes watered. still i have the parts so why not? plus i love to tinker.
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Post by 90GTVert on Dec 13, 2010 15:38:28 GMT -5
You can use a strap wrench or a spanner that fits in the holes on front or something along those lines to hold the clutch bell and remove the nut with a large ratchet/breaker bar. I agree with lshigham though, I wouldn't worry about clutch springs too much. Worth a shot since you have them I suppose, but I've never really liked them on the GY6 50 with any setup I tried. The P absolutely does not mean it has a longer stroke. Some think the Peace scoots with a P code are all 60cc because of a larger 44mm (39mm is standard) bore. To my knowledge that has never been proven. It may be likely, but not necessarily so of all Peace scoots with a P code. The P is actaully just supposed to designate that the engine is horizontal, which all 139QMB and 1P39QMBs are. I'd go with a 47mm kit (72cc). 50mm would be the largest I would consider unless it's a race scoot. For a scoo tthat you will ride a lot though, I'd definitely choose 72cc unless you are prepared for a fairly short engine life. I installed a brand new crank with my 50mm kti and it lasted 2,009 miles before the new crank failed. Many others have reported similar results with the 50mm+ kits. To be fair, some have reported more than 2,000 miles and no issues too. Regardless, the more weight you add to the crank in the form of larger pistons and the more power you make, the more you stress the crank and bearings. The 47mm kits seem to do much better and have way less instances of early failure, though there are some out there. If you really want to get that extra oomph and have to have 80cc or so, the 50mm is almost guaranteed to fit the engine cases with no work. Some will fit 52mm with no work, but not all. In some instances the cases aren't aligned quite right and even a 50mm kit can be an issue. Also with the 80cc kit you will likely need a larger combustion chamber (new head or mods to stocker) so the compression doesn't get too high for mormal use. Even with a 47mm kit, you'll probably need premium pump gas and in some cases they need larger combustion chambers or for the ignition timing to be retarded slightly. Whatever you choose, get a good kit like an NCY. Some of the really cheap stuff has low compression from poor tolerances and kit design. If you check the banners on the main page you can get the NCY kits at Enviromoto and use the discount code from the banner for 10% off. Also, 1,500 miles should not need a new cylinder kit. I wouldn't do this for that reason. Like Luke said, a good oil/fluid change and some checks and what not should cover it unless you are having some problem... 49ccscoot.proboards.com/index.cgi?board=basicstuff&action=display&thread=344EDIT : Sorry I type slow so you replied by the time I got this out. lol I wouldn't be going all out down hills too much with a big bore kit. As I said above, it's more stress with bigger pistons and if you get that little motor turning enough revs to do 60 you're lucky it doesn't blow stock. lol Another note, stock speedos are notoriously optimistic. |
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Post by malerocket on Dec 13, 2010 16:05:57 GMT -5
rr. when i first got the scooter it was more of a toy. now since my car is dead its gotten to be primary. i also have the torque spring to replace which i thought would help more with the climbing of hills. i always always use 92 gas since the engine is tiny with high compression. its not been abused mechanically, just through lots of collateral damage. i dont really want to replace the head because of wear, but more because i want to fly. it was great once while flying down same hill i passed 3 harleys stopped at a light. timed it right and blew past em. they caught up quick but the looks i got were priceless. thanks for the help now im off to drain oil and crack open the head cover.
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Post by 90GTVert on Dec 13, 2010 16:36:11 GMT -5
Yes, the torque spring shoudl help with going up hills and acceleration. Since it's more of a primary vehicle now, I'd definitely pick a 47mm kit if it were mine.
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Post by lshigham on Dec 13, 2010 17:03:03 GMT -5
The factory specs for compression are 10.5:1, by no means high compression. If you do get a 70cc BBK and re-use the stock head, that's when you need to worry about the octane of the fuel you use.
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Post by malerocket on Dec 13, 2010 18:27:05 GMT -5
compression test cleared 125 and i didnt push it all the way. so the top end should be good even if dirty. oil draining now and frame is detached from motor. if shes still good ive got sweet plans for it on low budget. lots of maintenance to do first. sorry no camera since i gave mine to my sister since she has a toddler. but im sure everyones seen a filthy scooter in 50 pieces. 72cc sounds good since im not racing, but looking for a little boost.
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top looks perfect. thanks marvel mystery oil. intake valve is dead on. exhaust valve has sit down pretty far. have to hear it run before i decide to do valve job, and maybe just upgrade instead. the cam has a little play at tdc. how much is normal on a broken in scooter?
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Post by Enviromoto on Dec 16, 2010 10:31:50 GMT -5
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Post by lshigham on Dec 16, 2010 11:37:54 GMT -5
I do recall reading that, I was going by my manual. |
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Post by Enviromoto on Dec 16, 2010 13:00:01 GMT -5
There are a lot of false statements in those manuals.
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Post by lshigham on Dec 16, 2010 13:33:32 GMT -5
There are a lot of false statements in those manuals. Oh aye, I know that. I don't know if anybody actually measured it, or they just made the number up. |
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Post by wikkedspree57 on Dec 24, 2010 21:45:41 GMT -5
Good tip I found for your clutch from personal experience - use a clutch from a 1987-2001 Honda Aero/Elite 50 S/SR/LX. The stock 2T clutch fits the GY6 clones and has a higher engagement/shift RPM out of the box. This made a night and day difference on the Wildfire I used to have.
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