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Post by thebigk on Jan 2, 2015 15:42:10 GMT -5
Do I measure from the center of the bolt to the center of the bolt, or internal width from the edge?
It looks like it's 3" from center to center
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Post by thebigk on Jan 2, 2015 13:58:53 GMT -5
I forgot to mention that this is a XY-157QMJ , researching more, the 2 bolt valve cover might make most of the upgrades a deal breaker! I have an extra long case, so the crankshaft upgrades are a no go  I will have to measure the heads and see if the BB is actually upgradeable, maybe I'll just upgrade the smaller scooter with a regular length case, and 4 bolt case. Might as well make my ladies scooter very fast  |
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Post by thebigk on Jan 2, 2015 12:21:46 GMT -5
Hey guys as far as BB kits are concerned, I'm stuck between looking at 4 valve heads and 2 valve heads...does it really matter THAT much...if I don't intend on actually racing it? I saw some big valve 2 valve heads that I thought would work well, I want to steer away from milling the crankcase, or purchase a pre-milled crankcase unless you think a local automotive machine shop could handle it easily. (Do these things come with good instructions?)
Has anyone actually replaced the crankshaft for a performance one and felt it was a worthwhile upgrade. ($150) for the added displacement?
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Post by thebigk on Dec 31, 2014 0:06:28 GMT -5
Hi Jerry,
thanks for the detailed response. I will message tvnacman about the CDI, as far as BBK's are concerned, should I go as big as I can or stray away from milling casing? I have seen a number of BBK all over the web, any rule of thumb, when it comes to deciding what to get? The one I am really keeping an eye on is a kit with performance cams. I'm worried whether they will work for me though
I have the XY-157qmj, I'm not sure if it matters but I either have the long case or extra long case, variator or clutch upgrades necessary
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Post by thebigk on Dec 30, 2014 18:50:13 GMT -5
I put an NGK plug in, I checked the valves.... completely and absolutely tight! Adjusted, and it's starting great now! I am wondering if my other scooter has the same issue. I guess now I am already looking at upgrades, but I think I should ride around with my girlfriend before I decide which upgrades are necessary. I saw some nice upgrades like the cdi, coil, exhaust, intake, and larger carb, eventually to build up to the Big bore kit. Thank you for the advice! |
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Post by thebigk on Dec 29, 2014 16:56:54 GMT -5
An old scooter dealer was getting rid of a few broken scooters so I took them, one has a bad throttle, one has a bad engine (not sure exactly what), one is a Sporty 150 (too small for me) Can't start/idle
The Racer 150... it has 3 miles on it, and never really been ridden. I have read the old thread on the other boards about necessary upgrades. This thing has all original fuel lines, vacuum lines, I replaced the fuel filter.
I would like to eventually upgrade this to handle myself (230 lbs) and my girlfriend(140 lbs) around the hilly areas. Right now I can't even ride it to the DMV to register it!
So if I spray some carb cleaner, it'll fire up for about a few strokes and die. I was able a few times to get it to start, and idle while putting a rag in the air intake after removing the filter.
Lastly, I replaced the carb with a carb from amazon for about $30. I have tweaked with the air/fuel adjustment screw to no avail (probably made it worse) I also am considering re-jetting it to something bigger as per suggestions on several threads.
Eventually I'd like to at least do some simple upgrades, and perhaps later on consider BB, CVT, and camshaft upgrades
Besides that happy Holidays everyone! We just moved to a new area that is scooter friendly so I'd like to at least get two of these guys working...hopefully maybe all 4 eventually! |
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