The 47mm BBK Thread : Only If You've Installed One Please

[dan50]

motoxracer98 do you have a link for that MRP exhaust? Also, did the exhaust bolt right on or did you have to mess with it?

A lot of aftermarket performance exhausts state that it may not fit and you have to work on it to get it mounted. I don't have a pipe bender so I need a performance exhaust that is plug & play.

What brand of BBK did you install?

[jaga4life]

Forgot to post it. But about a month ago my buddy bought a large scoot with 13inch wheels and a 139qmb. It had 8k miles on it. Rebuilt it with a 47mm kit. It has been a month of him holding it WOT for hours at a time and still no crank failure. I have it tuned a little rich for him for the peace of mind. It will top out at 48mph and when riding with him on my 150 it keeps up very well.

[motoxracer98]

Jul 23, 2017 3:42:17 GMT -5 dan50 said:

motoxracer98 do you have a link for that MRP exhaust? Also, did the exhaust bolt right on or did you have to mess with it?

A lot of aftermarket performance exhausts state that it may not fit and you have to work on it to get it mounted. I don't have a pipe bender so I need a performance exhaust that is plug & play.

What brand of BBK did you install?

I dont have a link for the exhaust ill try to find you one ive actually heard they quit making these exhausts but you may stil could find one . I bought it from a shop whos had it for a couple years . My bbk is just a cheap one from ebay . It its just as good as the others i think im installing the a9 cam now been riding with the stock one im hoping this will wake it up even more ill post the results

[dan50]

motoxracer98, the A-9 cam brings a 47mm BBK to life like Frankenstein's Monster!

A 19mm or 20mm carb is also a good thing with the BBK. I bought a Glixal 20mm carb and it is running very well now that I have the jetting dialed in. Inexpensive, but a nice carb. Link;

www.amazon.com/Glixal-ATMT1-073-1-Carburetor-Electric-Chinese/dp/B01EWHUHMM/ref=pd_sbs_263_9?_encoding=UTF8&psc=1&refRID=QZCQY2AA42XGFD2FGRX0

Link to Glixal A-9 cam;

www.amazon.com/gp/product/B00Y8FP4ZY/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1&tag=viglink20248-20

[farmer54]

well after about 3100 mi the engine tightened up and quit on me.

after it cooled off (me too) it started up and ran ok but after moving to barn it had tightened up again. I have some major health issues that keep me from walking far distances so my wife and I decided after 5 yrs of fun it is time to move on to a better quality cycle. I'm looking at a ruckus or kymco K-pipe. I have already given both scooters to a friend. farmer54

[90GTVert]

Aug 16, 2017 10:24:42 GMT -5 farmer54 said:

well after about 3100 mi the engine tightened up and quit on me.

after it cooled off (me too) it started up and ran ok but after moving to barn it had tightened up again. I have some major health issues that keep me from walking far distances so my wife and I decided after 5 yrs of fun it is time to move on to a better quality cycle. I'm looking at a ruckus or kymco K-pipe. I have already given both scooters to a friend. farmer54

Sorry to hear about your scoot, but thanks for sharing. Please let us know what scoot you end up with and I (and prob many others) would be interested to hear about the new big name scoot experiences as well once you get it.

[farmer54]

thanks brent I'll probably stay on board as this forum is the best one I'm on (I'm on about 6-8) and I really enjoyed the 49cc experience. frank

[badluna]

For the record.

I installed my BBK @ 60 km.

Im up to 4600KM and now im moving up to the full 50mm

No issues. No oil leak no nothing.

[bullcharles1]

Bit the bullet installing a glixal 47MM BBK today, with A9 Cam. Wish me luck!

[bullcharles1]

Update, got it installed and it's running great, love it! Should have done it sooner. The low end power is so much better it's like night and day!

I wasn't able to use the glixal head, the valves/springs sit too low for the rockers to reach, had to put the stock head back in. Has anyone else seen this issue, what's the remedy?

Update: found out the head has 64mm valves, need to buy a 64mm rocker assembly. No big deal $12 on Amazon!

[RollingThunder]

Bullcharles, where did you get the cam/bbk from?

[bullcharles1]

Piston/cylinder
www.amazon.com/gp/aw/d/B01303YPEU/ref=yo_ii_img?ie=UTF8&psc=1

A9 Cam
www.amazon.com/gp/aw/d/B00Y8FP4ZY/ref=yo_ii_img?ie=UTF8&psc=1

Head
www.amazon.com/gp/aw/d/B014T9BCJU/ref=yo_ii_img?ie=UTF8&psc=1

Installed it all without dropping the motor. Took about three hours but it was my first time in a scoot motor. Hardest parts putting in the clip to hold the piston pin in, and getting the Cam in the right spot in the chain. The rest is fairly simple bolt out, bolt in.

[RollingThunder]

Thanks. I was most curious about the camshaft since the Glixal A9 is out of stock everywhere I've looked. I <think> I found another A9 camshaft but it's just labeled as "performance". I might just wait to buy all my BBK stuff in spring since the riding season is pretty much over here.

[scooterpimp]

Installed 5 - 47mm/80 cc bbk. 2 i cant account for (sold) the others are still scooting around .once my new scoot arrives..guess what its getting....

[diynuke]

Dec 29, 2017 21:01:16 GMT -5 scooterpimp said:

Installed 5 - 47mm/80 cc bbk. 2 i cant account for (sold) the others are still scooting around .once my new scoot arrives..guess what its getting....

Same going on here xD

2x Grandretro 72cc.

2x Kymco agility 50    72cc

1x Sym fiddle 2 (2008 gy6 model) 72cc

the sym fiddle runs perfectly
 my grand retro leaks a little bit of oil at the cylinder gasket need to fix that one day.. ;P
and my kymco well i had to do a valve job 2x but the bbk itself didn't fail.
just my own fault not tuning it properly.. (too rich)