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Drifter 800
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Posted: 08/17/08 02:40 PM
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Hi Iam new to the site and have a question regarding my Vulcan Drifter 800. I love the looks of this bike and want to keep it. I have added a Kuryaken hyper charger, Vance and Hines exhaust system and a belt drive to improve my performance and would like to know what else I can do to increase my horse power. Every one I have asked says nothing else can be done. Is there anyone who has any sugesstions? Because of the design it is hard to carry anything on long trips and want this extra power to pull a small trailer as well as a passenger.
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frbock
Enthusiast
| Posts: 521
| Joined: 11/07
Posted: 08/17/08 05:09 PM
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If you'll pardon me, I'm going to give you several answers. 1) talk to these dudes http://autos.groups.yahoo.com/group/drifter/
2) I rode a Drifter 800 for 37k and 7 years. I tried the belt, switched back to a 17/38 chain (about the same final). I never replaced the exhaust, but, I put in a Thunder Air kit. Bike was too lean after installing. But, after the install, 30-50 in 3rd went from 5 sec to 4 sec. About a year later, I got it into a shop that did a full tune on the carb, idle to main. I never measured it after, but it ran smoother, and likely a little quicker.
Where I suspect you've got a problem is in perception. The 800 in stock gearing does almost 50 in 1st before the rev limiter jumps in, 80 for 2nd. You've geared it up. When I was riding. I upshifted out of 1st after 30 mph. I came out of 2nd around 60. The 800 has modest torque, but, after what you've done to it, you've increased horsepower, which requires high RPM to get.
If you're coming out of 1st at 20, you are robbing yourself of almost all the power the motor makes. Been there, done that. Try up shifting at 30 or so. The 800 is free revving, hp generating, fun sun of a gun motor. Only reason I sold it was because my wife hops on the back. No problem on power once you keep the RPMs up, but if you want to do a couple hundred miles, it gets a little tight.
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sloowpoke
Enthusiast
| Posts: 433
| Joined: 07/08
Posted: 08/18/08 07:36 AM
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Yeah, opening up the restrictive exhaust and intake means the chambers don't scavenge as well at low rpm. That robs you of low end torque but makes more power if you stop using 4th gear under 100mph or 5th gear at any speed. If you really want to improve performance below 4,000 rpm, put the stock exhaust back on the bike and remove the baffles. The small diameter pipes will increase the exhaust gas velocity to restore chamber scavenging at low rpm. If that isn't enough, then you'll need more displacement or a small turbocharger :-)
Kawasaki built their reputation on performance and they did a pretty good job with the 800 engine in it's stock setup, for low rpm performance. Most VN800 mods will do nothing to improve low rpm performance and may actually reduce it to gain high rpm improvements.
regards, Joe
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frbock
Enthusiast
| Posts: 521
| Joined: 11/07
Posted: 08/22/08 05:22 PM
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Not sure, I think we scared him off. Or it wasn't the answer he wanted.
But, I never regretted more than 1 or 2 miles on the Drifter (when the belt broke).
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