I have an 06 America that I love, But it seems to be working way to hard to maintain speed at 65 70, I have had it checked and tuned . Is this just the case for this bike 790cc , I have thought about changing the rear sprocket to see if that would help , I have had other bikes small in cc that handled this speed easier, Any help would be appreciated, I could be overlooking something very simple , It handles like a dream in traffic and speeds of 50 to 60 ,
06 america highway speeds
- Thread starter Baz790
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could be it's overgeared
I'm running a 790 speedmaster with a 17 tooth front sprocket and it runs 60 to 80 mph (4-4500 rpm)like a breeze
I do however run lite, one up and no screen or bags, just wot fits in my pockets and tool roll.
Dont let the 790 size worry you, they run with the best of them. :happy:
I'm running a 790 speedmaster with a 17 tooth front sprocket and it runs 60 to 80 mph (4-4500 rpm)like a breeze
I do however run lite, one up and no screen or bags, just wot fits in my pockets and tool roll.
Dont let the 790 size worry you, they run with the best of them. :happy:
Baz, my wife and I both have 2003 790 T100's. Well hers is now a 900; but that's another story. Anyway, the T100's came with a 17 tooth front sprocket. I was forever looking for 6th gear at highway speeds. I changed my sprocket to an 18 tooth and that dropped the revs by about 400 at any given speed without sacrificing acceleration. Some guys I ride with have gone to 19 tooth front sprockets. I chose not to do that because when we ride two up, we use my bike.
That said, the parallel twins are made to rev on the high side. The sweet spot is about 4000 rpm on mine. I find the 18 tooth sprocket is an all around good choice for me. Somewhere along the line, Triumph realized this and began using the 18 tooth sprocket as standard.
See what sprocket your America has and go up one tooth on the front sprocket. I think you will be pleased. It is an easy swap. Be sure to get a new washer if you do the swap yourself - which you can easily do. The washer is the kind that you bend up to lock the nut in place.
That said, the parallel twins are made to rev on the high side. The sweet spot is about 4000 rpm on mine. I find the 18 tooth sprocket is an all around good choice for me. Somewhere along the line, Triumph realized this and began using the 18 tooth sprocket as standard.
See what sprocket your America has and go up one tooth on the front sprocket. I think you will be pleased. It is an easy swap. Be sure to get a new washer if you do the swap yourself - which you can easily do. The washer is the kind that you bend up to lock the nut in place.
Thanks to all of you I will replace the front sprocket, Also if you are in the orlando area , There is a shop called cycle pro on chickasaw who can work on just about any bike give him a shot , Gonna replace the front sprocket , put on risers on the handle bars , Honey I need the check book lollllllll
Where in Orlando are you? I'm in Altamonte Springs. I will have to check that shop out. Thanks for the tip. I take mine to Cycle Werks in Ocala since I do not know of a good shop around here. Al, the owner, has three Triumphs himself.
[quote author=Lonzo link=topic=9296.msg45819#msg45819 date=1269878705]
I can't think of any gear scenario that would limit the bike to that speed. Have you pulled your hidden fuel filter? Mine did that, pulled the little filter and replaced it with an in-line. The hidden filter is a tiny thing, inside the fuel line where it tees between the carbs.
[/quote]
You know I don't have a bike with this engine, but when I was reading this thread I thought the same thing. I understand that people want their bikes to perform exactly the way they want it to and that a different ratio would be an addition. But it's hard to believe that they are that bad in this respect without some other problem being involved.
I do know that Trophys are prone to having clogged "hidden" gas filters...probably the same type as Lonzo mentioned. It seems pretty reasonable to me that this could be the actual cause although changing sprockets still sounds like an additional performance enhancer.
I can't think of any gear scenario that would limit the bike to that speed. Have you pulled your hidden fuel filter? Mine did that, pulled the little filter and replaced it with an in-line. The hidden filter is a tiny thing, inside the fuel line where it tees between the carbs.
[/quote]
You know I don't have a bike with this engine, but when I was reading this thread I thought the same thing. I understand that people want their bikes to perform exactly the way they want it to and that a different ratio would be an addition. But it's hard to believe that they are that bad in this respect without some other problem being involved.
I do know that Trophys are prone to having clogged "hidden" gas filters...probably the same type as Lonzo mentioned. It seems pretty reasonable to me that this could be the actual cause although changing sprockets still sounds like an additional performance enhancer.
It's not that they don't perform; they certainly do. At freeway speeds it just feels like you need to shift. You don't get this on country roads at 60 mph and less and you don't get it in the twisties. Somehow that drop of 400 rpm (per additional tooth) at 75-80 mph just makes a difference. If I was solo all the time, I would have gone to a 19 tooth. However, now that I live in suburbia, I don't notice it as much when as when I lived in the open rural area.
So in common language, the engine is buzzing (revving) more than people would want at those speeds?
I can certainly understand that since my Trophy was that way originally and a one tooth change in sprocket size made all the difference.
Perhaps I just misunderstood what was meant by "it seems to be working way to hard to maintain speed at 65 70". I took that to mean that the engine seemed too weak to maintain higher speeds. Not that it was just too revvy at those speeds.
I can certainly understand that since my Trophy was that way originally and a one tooth change in sprocket size made all the difference.
Perhaps I just misunderstood what was meant by "it seems to be working way to hard to maintain speed at 65 70". I took that to mean that the engine seemed too weak to maintain higher speeds. Not that it was just too revvy at those speeds.
My America with stock gearing runs about 4,000 RPM at 70 MPH (indicated). In 5th gear at 65 MPH I can hit the throttle and it zooms right up to whatever speed I want. Yesterday I came back from Jennings on Fl 90 (parallels I-10) and easily cruised at 80 MPH. Wouldn't hurt to have a 6th gear, but I never have the sensation that the engine is straining to maintain speed, or is too buzzy. If I'm passing someone from 60 MPH or so, I'll drop down to 4th and zip around in the blink of an eye. The only performance modifications I have are the Triumph short TORs, removed rubber intake snorkle, and appropriate jetting.
I tried a countershaft (front) sprocket with 1 more tooth a couple of years ago. It was nice on the highway, but I do too much in town riding and changed it back. Lost too much off the line for my liking.
When the hidden filter was clogged, it would absolutely not go over 85 MPH.
I tried a countershaft (front) sprocket with 1 more tooth a couple of years ago. It was nice on the highway, but I do too much in town riding and changed it back. Lost too much off the line for my liking.
When the hidden filter was clogged, it would absolutely not go over 85 MPH.
Lon, I agree with you. Had I gone to a 19 tooth, I would have dropped back to the 18 when I moved to suburbia.
Yes, AJ, it is not that the engine is working too hard at freeway speeds - there are plenty of revs left - it just "feels" too buzzy. I don't even hit 5000 rpm until 78 mph. There is still a long way to go until the rev limiter kicks in. The sweet spot for my engine is about 4000-4500 rpm and that feels good cruising a around 75 mph. She feels like she could just run forever.
Yes, AJ, it is not that the engine is working too hard at freeway speeds - there are plenty of revs left - it just "feels" too buzzy. I don't even hit 5000 rpm until 78 mph. There is still a long way to go until the rev limiter kicks in. The sweet spot for my engine is about 4000-4500 rpm and that feels good cruising a around 75 mph. She feels like she could just run forever.
Carbs are were/are in sync. This was a very common complaint with the Bonnies until the the 18 tooth sprocket became standard. The complaint was that it seemed to need one more gear for easy cruising. Somewhere around 2004/2005 the 18tooth sprocket became standard - which many of us had already installed.
I have left the 17 tooth sprocket on Mae Lyne's rig because she is hauling the sidecar. She needs that lower end power for the extra weight and drag. We don't run much over 65/70 with the rig anyway.
I have left the 17 tooth sprocket on Mae Lyne's rig because she is hauling the sidecar. She needs that lower end power for the extra weight and drag. We don't run much over 65/70 with the rig anyway.
I think you are right; it coincided with the end of the 790.
Thanks to everyone , I have checked the hidden fuel filter it is not clogged, But i am having the shop put on the new sprocket and check everything, , This bike runs like a champ but it revs way to high at highway, I think the sprocket should fit the bill if Not I guess that leaves me with no real choice but to But the new thunderbird hahahahaha
let us know how it goes with the new sprocket Baz.
:y18:
:y18:
I would opt for the new Thunderbird!! :y114: Do let us know what you think of the new sprocket. I think you will be pleased.
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