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Post by JerryScript on Jun 7, 2016 16:35:57 GMT -5
Since I recently had to replace my head due to blowing out the spark plug, I decided to finally install a BBK in my SSR Pacifica 150cc. I've ordered the 61mm Taida drop in kit that requires no case boring, which will bring me up to just under 170cc with the stock crank. Looking forward to getting it installed, will post details here.
For comparison, I currently can reach 70mph on flat highway with no head wind, at just over 7000rpms, at WOT of course. I'm hoping to be able to get a similar top end, but have just a bit more throttle response for times when I need to be able to get out of the way.
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Post by pistonguy on Jun 7, 2016 17:55:34 GMT -5
Nice!
Taida 61mm product is very high quality.
I look forward to the results on that Blue Beauty.
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Post by ricardoguitars on Jun 7, 2016 19:24:21 GMT -5
I'm on the same boat, got the Taida 61mm plus a NCY big port head, looking forward for your results, I would like to compare the difference between 16" wheels vs 12".
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Post by JerryScript on Jun 7, 2016 19:53:06 GMT -5
I'm on the same boat, got the Taida 61mm plus a NCY big port head, looking forward for your results, I would like to compare the difference between 16" wheels vs 12". I'm not sure if they make a big valve head for the BN157QMJ-3, I have seen a 4 valve head, but from what I've read in various forums, the 4 valve heads are not as good as a 2 big valve head, especially if ported. I'm keeping my eyes open! Did you stick with the stock carb, and/or did you have to upjet? I would like to get a couple of jets to have on hand, just in case. |
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Post by ricardoguitars on Jun 7, 2016 19:57:01 GMT -5
I'm on the same boat, got the Taida 61mm plus a NCY big port head, looking forward for your results, I would like to compare the difference between 16" wheels vs 12". I'm not sure if they make a big valve head for the BN157QMJ-3, I have seen a 4 valve head, but from what I've read in various forums, the 4 valve heads are not as good as a 2 big valve head, especially if ported. I'm keeping my eyes open! Did you stick with the stock carb, and/or did you have to upjet? I would like to get a couple of jets to have on hand, just in case. I have Scrappy's 30mm carb and DStar full exhaust system, I have plans to get a slide carb later, have heard nothing but good things about them. |
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Post by JerryScript on Jun 8, 2016 4:06:19 GMT -5
I'm trying to decide on my intake and exhaust system. I would like to have a custom wide open header built, but I don't want to change the exhaust itself, it's well designed for this scooter.
The stock air filter is a beastly 6" diameter by 9" long metal cylinder holding a cylindrical fan fold air filter. It's huge, and together with the battery being under the seat, there is only a 4" x 9" x 6" storage space, just holds my wrenches and drivers, the socket set I have to carry in the trunk. I would love to switch to a cold air intake with a long neck and uni style filter, and build an under-seat storage basket in the freed up space.
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Post by JerryScript on Jun 10, 2016 14:19:35 GMT -5
Just received the BBK in the mail. The quality of this Taida kit over every other BBK and head I've bought is night and day. All other pieces I've purchased in the past had rough edges inside and out, this one appears flawless! If it performs as good as it looks, I'll be buying Taida parts from now on.
My next day off is Monday, can't wait to get this installed! I'll post some pics, and the results.
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Post by JerryScript on Jun 13, 2016 17:04:47 GMT -5
Installed the BBK this morning. The drop in 61mm kit fit perfectly with out needing to bore or even sand the case, the skirt fit perfectly.
I put everything back together but the plastics, pushed the starter button, and she started instantly. I let her warm up, then tuned the a/f mixture, didn't seem to need upjetting the pilot, nice snappy throttle response at 2 3/4 turns out.
Put the plastics back on, started right back up, took her for a test ride around the block. Only took her up to 40mph, but I could feel the increase in lower end power. Gonna take her on a longer ride this afternoon, then if all is well I'll hit the freeway for a short run tomorrow.
Tip: The first BBK I installed, I put the piston on, then the jug, and fought for a good 10 minutes getting the rings into the skirt by hand. Next two BBKs I did, I used a hose clamp to compress the rings, tapping the jug down onto the piston, pushing the clamp off, worked pretty good but scared me I was damaging the rings. This time, I installed the piston in the jug before putting the jug on. I had to leave the oil rings half out of the skirt in order to put the circlips in, but they tapped right in to the skirt no problem. This was the easiest of the three methods I've used to install the piston!
So long as she holds up, I'll definitely recommend this drop in kit for anyone who wants the biggest BBK possible without boring your case! And yes, it fits the BN157QMJ-3 perfectly as well as standard 157QMJ engines.
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Post by JerryScript on Jun 13, 2016 19:41:11 GMT -5
I just got back from Scrappy's, picked up a few jets. I could feel the need for more fuel once I got above 45mph. I picked up a 38 pilot jet, and 115 & 125 main jets.
The ride to Scrappy's and back is a good break in run. High traffic, so speeds are up and down, 55mph was fastest I took her, other than hesitating when cruising above 40 mph due to being thirsty, she had no issues at all. Can't wait to jet her up and twist that grip!
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Post by pistonguy on Jun 13, 2016 22:29:14 GMT -5
Love it when a plan comes together.
Are you working with stock OE intake, snorkel air box?
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Post by JerryScript on Jun 13, 2016 23:19:52 GMT -5
Love it when a plan comes together. Are you working with stock OE intake, snorkel air box? Stock setup for now. Intake manifold is the taller type, and the air cylinder is a beast for a scooter: www.thriftyscooters.com/images/Znen_150_18_AirFilter_Assembly.jpgI've only had to turn the air filter once. So long as it lets her breath, I would like to stick with it, even though I often fantasize about replacing it with a uni and rebuilding my seat bucket to get more storage. |
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Post by rcq92130 on Jun 13, 2016 23:29:36 GMT -5
Way cool project!
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Post by JerryScript on Jun 15, 2016 23:17:35 GMT -5
Thanks! I went way too rich! This model comes with a 32 pilot and a 100 main. After installing the BBK, there was a bit less throttle response at takeoff, and hesitation above 40mph. With the 115 main and a/f screw 2 3/4 turns out, I had better takeoff, but full throttle at any speed would bog, engine did not speed up when let off 1/4 turn. Next I put in the 38 pilot and left the 115 in, had to turn a/f screw all the way in for best rpm and throttle response. This combo resulted in bogging unless I was gentle on the throttle at any speed, and even then there was some hesitation. Went back and picked up a 105 and 108 main, and a 35 pilot. I put the 108 and 35 in, tuned best at 1 1/2 turns out, and she's roaring now. Can takeoff at light throttle or full throttle without hesitation, great response on up, and cruised on my test run at 50 up slight incline against gusting winds at half throttle, with instant response zooming up to 55 with another 1/4 turn, and back down with no bogging, hesitation, or backfire. Was dark by then, so still no highway run yet. Will take one tomorrow, still not pushing top speed, but should get a good feel for final adjustments to the carb with a bit of high speed wot. Really surprised by the small stock jets on this scooter! |
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Post by rcq92130 on Jun 15, 2016 23:32:22 GMT -5
I know you saw this (b/c you wrote a response), but the second best thing I've ever done, scooter-wise, is put together a fuel-air mixture gauge. Without this you are literally just tuning with eyes closed. Even the best of ears makes this hard and inaccurate. If it were me .... with the top notch engine you now have .... I'd invest the $25, put together a gauge, and then tune accurately. Even if you then threw the contraption out it would be well worth it. Yours isn't any longer a lawnmower but a Caddy.
about 2/3 of the way down
ps: I've found I actually watch my gauge all the time, and find it very interesting to see what part of the RPM and torque range the engine runs lean or rich. It turns out to be a pretty complex issue.
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Post by JerryScript on Jun 16, 2016 0:18:03 GMT -5
I know you saw this (b/c you wrote a response), but the second best thing I've ever done, scooter-wise, is put together a fuel-air mixture gauge. Without this you are literally just tuning with eyes closed. Even the best of ears makes this hard and inaccurate. If it were me .... with the top notch engine you now have .... I'd invest the $25, put together a gauge, and then tune accurately. Even if you then threw the contraption out it would be well worth it. Yours isn't any longer a lawnmower but a Caddy.
about 2/3 of the way down
ps: I've found I actually watch my gauge all the time, and find it very interesting to see what part of the RPM and torque range the engine runs lean or rich. It turns out to be a pretty complex issue.
Do you happen to know any car models that use that type sensor that you used? |
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