Cheapest and easiest way to go to 6-speed?
Stellar HDF Member
Joined: Jul 2017
Posts: 3,333
Likes: 1,280
From: Ky
Bump the final drive ratio, can be pricey. Or the primary drive, would be my suggestion.http://www.hotbikeweb.com/under-budg...motor-sprocket
Ultimate HDF Member
Joined: May 2006
Posts: 6,590
Likes: 444
From: Ohio
yet.
Club Member
Joined: Aug 2008
Posts: 22,848
Likes: 17,894
From: Lafayette, Louisiana
I was contemplating the exact same thing a few years ago. I felt like my bike was screaming on the interstate so I thought I needed an extra gear.
Really long story but to cut to the chase, I made more power with my engine and kept my five speed, sprockets, etc. completely stock and I am happy.
Now for the details if you are interested. During production back then, there could be significant variances in the volume of the combustion chamber. As a result, if you happened to end up with two heads on opposite ends of the manufacturing tolerance, your engine will not run as smooth as it could. Also, when they changed to the N grind cam, the torque and horsepower dropped a lot.
The remedy? I had a small amount of material removed from my heads to equalize the volume of the combustion chambers and to bump up the compression. Evo's respond well to compression increases due to stock compression being marginal. I also went with a slightly thinner head gasket to increase the compression which also allowed me to not remove as much from the heads and still get the increase that I want. I changed the cam to an Andrews EV-13 because it suits how I ride the best. Andrews EV-27 is also a good choice. Change the cam bearing to Torrington while you are at it. New lifters are a smart thing too as a preventive measure. Change the ignition module to dynatek. Rejet the carburetor. I used a dyno jet kit which includes a thunder slide. Go with a free flowing air cleaner. A drop in k&n filter will not flow enough. The screaming eagle kit that includes new back plate etc works good. A well tuned exhaust is also a must. Stock exhaust is too restrictive and straight pipes or stock exhaust with busted out baffles are terrible and will hurt the low end torque,
I did all that to make more power to prepare for a six speed but when I was done, my bike ran so smooth and made so much power I was happy with it at that point. I used to cringe when my bike would be screaming and buzzing doing 70 mph. Now, I have to be careful because I can cruise at 90 mph and feel like I am going at a relaxed pace.
Bottom line, get your engine to run smoother and make more power.
Really long story but to cut to the chase, I made more power with my engine and kept my five speed, sprockets, etc. completely stock and I am happy.
Now for the details if you are interested. During production back then, there could be significant variances in the volume of the combustion chamber. As a result, if you happened to end up with two heads on opposite ends of the manufacturing tolerance, your engine will not run as smooth as it could. Also, when they changed to the N grind cam, the torque and horsepower dropped a lot.
The remedy? I had a small amount of material removed from my heads to equalize the volume of the combustion chambers and to bump up the compression. Evo's respond well to compression increases due to stock compression being marginal. I also went with a slightly thinner head gasket to increase the compression which also allowed me to not remove as much from the heads and still get the increase that I want. I changed the cam to an Andrews EV-13 because it suits how I ride the best. Andrews EV-27 is also a good choice. Change the cam bearing to Torrington while you are at it. New lifters are a smart thing too as a preventive measure. Change the ignition module to dynatek. Rejet the carburetor. I used a dyno jet kit which includes a thunder slide. Go with a free flowing air cleaner. A drop in k&n filter will not flow enough. The screaming eagle kit that includes new back plate etc works good. A well tuned exhaust is also a must. Stock exhaust is too restrictive and straight pipes or stock exhaust with busted out baffles are terrible and will hurt the low end torque,
I did all that to make more power to prepare for a six speed but when I was done, my bike ran so smooth and made so much power I was happy with it at that point. I used to cringe when my bike would be screaming and buzzing doing 70 mph. Now, I have to be careful because I can cruise at 90 mph and feel like I am going at a relaxed pace.
Bottom line, get your engine to run smoother and make more power.
Seasoned HDF Member
Joined: Nov 2009
Posts: 15,705
Likes: 22,718
From: Farmington ,MS
The Rivera-primo is about the same price...I run a 6 speed with a stock 80" with no problems...and can see out of the rear view mirrors at 80 mph.
http://www.jpcycles.com/product/630-...IaAsXoEALw_wcB
Thread Starter
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Grand HDF Member
Joined: Jul 2017
Posts: 4,693
Likes: 5,285
From: Behind you, making faces
I was contemplating the exact same thing a few years ago. I felt like my bike was screaming on the interstate so I thought I needed an extra gear.
Really long story but to cut to the chase, I made more power with my engine and kept my five speed, sprockets, etc. completely stock and I am happy.
Now for the details if you are interested. During production back then, there could be significant variances in the volume of the combustion chamber. As a result, if you happened to end up with two heads on opposite ends of the manufacturing tolerance, your engine will not run as smooth as it could. Also, when they changed to the N grind cam, the torque and horsepower dropped a lot.
The remedy? I had a small amount of material removed from my heads to equalize the volume of the combustion chambers and to bump up the compression. Evo's respond well to compression increases due to stock compression being marginal. I also went with a slightly thinner head gasket to increase the compression which also allowed me to not remove as much from the heads and still get the increase that I want. I changed the cam to an Andrews EV-13 because it suits how I ride the best. Andrews EV-27 is also a good choice. Change the cam bearing to Torrington while you are at it. New lifters are a smart thing too as a preventive measure. Change the ignition module to dynatek. Rejet the carburetor. I used a dyno jet kit which includes a thunder slide. Go with a free flowing air cleaner. A drop in k&n filter will not flow enough. The screaming eagle kit that includes new back plate etc works good. A well tuned exhaust is also a must. Stock exhaust is too restrictive and straight pipes or stock exhaust with busted out baffles are terrible and will hurt the low end torque,
I did all that to make more power to prepare for a six speed but when I was done, my bike ran so smooth and made so much power I was happy with it at that point. I used to cringe when my bike would be screaming and buzzing doing 70 mph. Now, I have to be careful because I can cruise at 90 mph and feel like I am going at a relaxed pace.
Bottom line, get your engine to run smoother and make more power.
Really long story but to cut to the chase, I made more power with my engine and kept my five speed, sprockets, etc. completely stock and I am happy.
Now for the details if you are interested. During production back then, there could be significant variances in the volume of the combustion chamber. As a result, if you happened to end up with two heads on opposite ends of the manufacturing tolerance, your engine will not run as smooth as it could. Also, when they changed to the N grind cam, the torque and horsepower dropped a lot.
The remedy? I had a small amount of material removed from my heads to equalize the volume of the combustion chambers and to bump up the compression. Evo's respond well to compression increases due to stock compression being marginal. I also went with a slightly thinner head gasket to increase the compression which also allowed me to not remove as much from the heads and still get the increase that I want. I changed the cam to an Andrews EV-13 because it suits how I ride the best. Andrews EV-27 is also a good choice. Change the cam bearing to Torrington while you are at it. New lifters are a smart thing too as a preventive measure. Change the ignition module to dynatek. Rejet the carburetor. I used a dyno jet kit which includes a thunder slide. Go with a free flowing air cleaner. A drop in k&n filter will not flow enough. The screaming eagle kit that includes new back plate etc works good. A well tuned exhaust is also a must. Stock exhaust is too restrictive and straight pipes or stock exhaust with busted out baffles are terrible and will hurt the low end torque,
I did all that to make more power to prepare for a six speed but when I was done, my bike ran so smooth and made so much power I was happy with it at that point. I used to cringe when my bike would be screaming and buzzing doing 70 mph. Now, I have to be careful because I can cruise at 90 mph and feel like I am going at a relaxed pace.
Bottom line, get your engine to run smoother and make more power.
So does your engine now actually run at a lower RPM at higher speeds? If not, it sounds like it might still bug me if it "feels" like it's screaming.
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Thread Starter
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Grand HDF Member
Joined: Jul 2017
Posts: 4,693
Likes: 5,285
From: Behind you, making faces
The Rivera-primo is about the same price...I run a 6 speed with a stock 80" with no problems...and can see out of the rear view mirrors at 80 mph.
http://www.jpcycles.com/product/630-...IaAsXoEALw_wcB
http://www.jpcycles.com/product/630-...IaAsXoEALw_wcB
