Hesitation/Stumble
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Road Warrior
Joined: Aug 2005
Posts: 1,949
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Hesitation/Stumble
Hello All,
Got a chance to do my first ride after installing cams. My set-up is 2011 RKC103 w/ Power Vision, Jackpot 2-1-2 and mufflers, AC, and SE 204. Map supplied by Jamie at FM, and I put on a VPC 92t to handle any clutch slippage.
Scoot runs very strong, no decel popping at all (thank you Jamie) but....
at about 3500 rpm, the bike has a noticable hesitation/stumble. Doesn't matter which gear. I didn't have my PV attached, but here is a RPM table for reference:
MPH Calculator
RPM 1 2 3 4 5 6
1000 7.5 10.9 15.2 19.6 23.9 27.8
1200 9.0 13.0 18.3 23.5 28.7 33.3
1400 10.5 15.2 21.3 27.4 33.5 38.9
1600 11.9 17.4 24.4 31.3 38.2 44.5
1800 13.4 19.5 27.4 35.3 43.0 50.0
2000 14.9 21.7 30.4 39.2 47.8 55.6
2200 16.4 23.9 33.5 43.1 52.6 61.1
2400 17.9 26.1 36.5 47.0 57.3 66.7
2600 19.4 28.2 39.6 50.9 62.1 72.2
2800 20.9 30.4 42.6 54.8 66.9 77.8
3000 22.4 32.6 45.7 58.8 71.7 83.4
3200 23.9 34.8 48.7 62.7 76.5 88.9
3400 25.4 36.9 51.7 66.6 81.2 94.5
3600 26.9 39.1 54.8 70.5 86.0 100.0
3800 28.4 41.3 57.8 74.4 90.8 105.6
4000 29.9 43.4 60.9 78.3 95.6 111.1
4200 31.4 45.6 63.9 82.3 100.4 116.7
4400 32.9 47.8 67.0 86.2 105.1 122.2
4600 34.3 50.0 70.0 90.1 109.9 127.8
4800 35.8 52.1 73.1 94.0 114.7 133.4
5000 37.3 54.3 76.1 97.9 119.5 138.9
5200 38.8 56.5 79.1 101.8 124.2 144.5
5400 40.3 58.6 82.2 105.8 129.0 150.0
5600 41.8 60.8 85.2 109.7 133.8 155.6
5800 43.3 63.0 88.3 113.6 138.6 161.1
6000 44.8 65.2 91.3 117.5 143.4 166.7
6200 46.3 67.3 94.4 121.4 148.1 172.3
In 1st gear, it happens at about 27-28 mph, for example, but knowing that my speedo is off about 1-2 mph, puts me right at 3500 rpm. 2nd gear about 39-40 mph, and so on. I could get it to do this consistently and up to about 4th gear. Didn't test 5th or 6th gear. Once the bike revs past 3500, it is very strong without hesitation once again. At first I thought it was just bad/old gas (even though I use Stabil), but it is so consistent in every gear this just can't be the case. I haven't looked at Jamie's map in this area yet, but that probably isn't the issue as the bike runs so strong everywhere else w/ no popping or hesitation. I am stumped and would appreciate any and all suggestions/comments. Thanks.
TedMan
Got a chance to do my first ride after installing cams. My set-up is 2011 RKC103 w/ Power Vision, Jackpot 2-1-2 and mufflers, AC, and SE 204. Map supplied by Jamie at FM, and I put on a VPC 92t to handle any clutch slippage.
Scoot runs very strong, no decel popping at all (thank you Jamie) but....
at about 3500 rpm, the bike has a noticable hesitation/stumble. Doesn't matter which gear. I didn't have my PV attached, but here is a RPM table for reference:
MPH Calculator
RPM 1 2 3 4 5 6
1000 7.5 10.9 15.2 19.6 23.9 27.8
1200 9.0 13.0 18.3 23.5 28.7 33.3
1400 10.5 15.2 21.3 27.4 33.5 38.9
1600 11.9 17.4 24.4 31.3 38.2 44.5
1800 13.4 19.5 27.4 35.3 43.0 50.0
2000 14.9 21.7 30.4 39.2 47.8 55.6
2200 16.4 23.9 33.5 43.1 52.6 61.1
2400 17.9 26.1 36.5 47.0 57.3 66.7
2600 19.4 28.2 39.6 50.9 62.1 72.2
2800 20.9 30.4 42.6 54.8 66.9 77.8
3000 22.4 32.6 45.7 58.8 71.7 83.4
3200 23.9 34.8 48.7 62.7 76.5 88.9
3400 25.4 36.9 51.7 66.6 81.2 94.5
3600 26.9 39.1 54.8 70.5 86.0 100.0
3800 28.4 41.3 57.8 74.4 90.8 105.6
4000 29.9 43.4 60.9 78.3 95.6 111.1
4200 31.4 45.6 63.9 82.3 100.4 116.7
4400 32.9 47.8 67.0 86.2 105.1 122.2
4600 34.3 50.0 70.0 90.1 109.9 127.8
4800 35.8 52.1 73.1 94.0 114.7 133.4
5000 37.3 54.3 76.1 97.9 119.5 138.9
5200 38.8 56.5 79.1 101.8 124.2 144.5
5400 40.3 58.6 82.2 105.8 129.0 150.0
5600 41.8 60.8 85.2 109.7 133.8 155.6
5800 43.3 63.0 88.3 113.6 138.6 161.1
6000 44.8 65.2 91.3 117.5 143.4 166.7
6200 46.3 67.3 94.4 121.4 148.1 172.3
In 1st gear, it happens at about 27-28 mph, for example, but knowing that my speedo is off about 1-2 mph, puts me right at 3500 rpm. 2nd gear about 39-40 mph, and so on. I could get it to do this consistently and up to about 4th gear. Didn't test 5th or 6th gear. Once the bike revs past 3500, it is very strong without hesitation once again. At first I thought it was just bad/old gas (even though I use Stabil), but it is so consistent in every gear this just can't be the case. I haven't looked at Jamie's map in this area yet, but that probably isn't the issue as the bike runs so strong everywhere else w/ no popping or hesitation. I am stumped and would appreciate any and all suggestions/comments. Thanks.
TedMan
Stellar HDF Member
Joined: Jun 2007
Posts: 2,928
Likes: 117
From: Ashby, Ma
I'd talk to Jaime and he might point you to some tweaks in the map that might help. Feels like either that or a real time dyno tune is needed.
As the bike is running smooth and strong all around this rpm range it doesn't seem like it could be mechanical or electrical.
My bet is a tweak to the map.
As the bike is running smooth and strong all around this rpm range it doesn't seem like it could be mechanical or electrical.
My bet is a tweak to the map.
Advanced
Joined: May 2011
Posts: 63
Likes: 0
From: Lakeland, Florida
I have a similar issue with my 2008 SG. Setup is: Fuel Moto 107BB, TW-555, HP Inc. 54 mm Throttle Body and Bassani Road Rage II 2-1 exhaust. The stumble occurs at around 2400 RPM on my bike. I have data logged with my Power Vision and then used the auto-tune to modify the map. This has helped, but the problem still exists. I am hoping that a dyno tune will solve the problem.
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