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A9 cam
by: scootzy - Apr 29, 2014 15:32:32 GMT -5
Post by scootzy on Apr 29, 2014 15:32:32 GMT -5
I am what I am in my sig. except for the iridium plug. Got to tell you guys about that as well. Fist bought my scoot, 0-1000mi. orig. plug, changed to an NGK ran for 1500mi. and changed to iridium. 1500mi. later I had spark prob. SO.... I checked the plug only to find out the center dode was hanging off the side of the ceramic coting. I changed back to the NGK plug with 1500mi. on it. Rouhg about 7500mi on this NGK plug. Ok, Now about the A9. Is there any other cams for the stock 50cc??? I've seen on you tube, gy6 unspecified cc's, that he broke both vv springs inner and outter from just installing an A9 cam. Is this true on a stock app?  ? scrappy's mo says it is ok to use on stock app. what do you guys say? |
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A9 cam
by: jjoshua20213 - Apr 29, 2014 17:59:36 GMT -5
Post by jjoshua20213 on Apr 29, 2014 17:59:36 GMT -5
I've used it in a stock 49cc bike and it did not cause any problems, changed back to stock. A9 is for bbk's
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A9 cam
by: scootzy - Apr 30, 2014 13:16:10 GMT -5
Post by scootzy on Apr 30, 2014 13:16:10 GMT -5
jjoshua, what made you change back to a stock cam?? Performance, lack of power in areas of the power band, ect.... This is the config. I'm going to; 20mm carb with  -38 jets A9 cam 44mm stroker, with raised head. optional 60cc Really just need to know am I missing anything, don't want a bbk larger than a 60cc. Oh, yeah, did a caliber check on both cams and .07mm diff or .00275in |
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Post by RapidJim on Apr 30, 2014 14:19:48 GMT -5
Been doing this stuff for a while now and have never seen broken valve springs from correctly installing an A9 cam.
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A9 cam
by: jjoshua20213 - May 1, 2014 7:20:25 GMT -5
Post by jjoshua20213 on May 1, 2014 7:20:25 GMT -5
jjoshua, what made you change back to a stock cam?? Performance, lack of power in areas of the power band, ect.... This is the config. I'm going to; 20mm carb with -38 jets A9 cam 44mm stroker, with raised head. optional 60cc Really just need to know am I missing anything, don't want a bbk larger than a 60cc. Oh, yeah, did a caliber check on both cams and .07mm diff or .00275in The bike it was in had issues but ran and I only rode it to a stop sign and back because it would barely move. Changed back to stock and did the same stop sign ride and it went a lot faster. Seemed to pickup after riding for awhile with the a9, so it could just be a slow low end pick up in the mid range. I would get at least an  main jet Why not bigger than 60cc? I know first hand the 50mm is reliable and starts easy. |
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A9 cam
by: bobby17772 - May 2, 2014 15:00:17 GMT -5
Post by bobby17772 on May 2, 2014 15:00:17 GMT -5
I've got the a9 in my 50mm and I love it, nothing really bad to say, I can't really make a comparison about it vs stock because I did everything at the same time, but I have had it in for probably 1500 miles and no problems
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A9 cam
by: scoots - May 3, 2014 14:04:37 GMT -5
Post by scoots on May 3, 2014 14:04:37 GMT -5
i have the NCY cam and its well worth it with my 50mm
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A9 cam
by: craisin - May 9, 2014 0:12:25 GMT -5
Post by craisin on May 9, 2014 0:12:25 GMT -5
i have read that the A9 has more lift than the rest.
my thoughts are the head with the longer valves would be best to use with a hi lift cam
and the stock head would be ok on a engine in good condition
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A9 cam
by: buford1488 - May 10, 2014 7:44:50 GMT -5
Post by buford1488 on May 10, 2014 7:44:50 GMT -5
not true..the longer valves have nothing to do with the duration of the lift.
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A9 cam
by: scootzy - May 12, 2014 13:50:20 GMT -5
Post by scootzy on May 12, 2014 13:50:20 GMT -5
ok, update.
I changed out the crnk seals and the a9 cam now won't start???
timing, vvs, gas, and air, all good. Then I noticed the two holes and one good sized rip on carb. diaphragm!
still with this, Am I missing any??
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A9 cam
by: alleyoop - May 12, 2014 14:54:10 GMT -5
Post by alleyoop on May 12, 2014 14:54:10 GMT -5
Diaphragm has nothing to do with start that is to lift the needle out of the main jet. Your problem is either the pilot jet fuel ratio mixture and or you timed it wrong. Also check if your getting spark.
Need pictures and more EXACT INFO Bro won't start could mean a lot of things since you took the motor apart.
Alleyoop
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A9 cam
by: scootzy - May 12, 2014 15:03:56 GMT -5
Post by scootzy on May 12, 2014 15:03:56 GMT -5
I did change the jets, too much gas you say.
I'll switch back to stock IJ, already swtchd the MJ, did'n think about the IJ.
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A9 cam
by: alleyoop - May 12, 2014 15:18:40 GMT -5
Post by alleyoop on May 12, 2014 15:18:40 GMT -5
Yep that is what people usually do they put in huge jets when not needed and just flood the poor little motor.
Usually the Pilot jet does not have to be changed only the main jet. If you change the pilot jet ONLY ONE SIZE BIGGER if it needs more gas on the low end. BUT IF you have a 33Pilot JET that should be FINE IF that is what you have in it . I am reading your sig.
Crank it over and then, Take the spark plug out and see if it wet or dry THEN ground it on the MOTOR THE VALVE COVER and crank it and see if it is firing.
Maybe you forgot to ground the MOTOR to the FRAME if you missed that ground wire the PLUG WILL NOT FIRE.
Alleyoop
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A9 cam
by: scootzy - May 12, 2014 16:24:30 GMT -5
Post by scootzy on May 12, 2014 16:24:30 GMT -5
and you know I only went to a #35, since there's a lil xtra flow from either duration or height of the lobe of cam.
though, does make sense not to, cause no bbk to supply extra low-end flow, thus, no need in the 35.
yes, plug is wet but fires great.
also, I have a carb diaphragm on it's way.
update in a while, changing IJ
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A9 cam
by: scootzy - May 12, 2014 17:13:13 GMT -5
Post by scootzy on May 12, 2014 17:13:13 GMT -5
ok, no spark
well I did have spark
so.. I'm going through the elec.
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-38 jets
main jet
..BAD TO THE BONE..