91 evo 1340 Andrews Cam Kit
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Road Captain
Joined: Nov 2009
Posts: 737
Likes: 4
From: Scotland,UK
91 evo 1340 Andrews Cam Kit
Im thinking of fitting an Andrews Cam Kit to my 91 evo. The bikes mileage is 58,000. I have done 4,000 mls, between repairs etc., since buying it 18 months ago. I was told when I bought the bike that it had been tuned ie. hot/hotter cam,skimmed heads. Dont know if any other tuning mods were done. Anyway...it is all heresay unless the engine is stripped and inspected!
I was considering buying & installing and Andrews Cam Kit & Adjustable Pushrod Kit. Any advice,recommedations & suggestions greatly appreciated.
Also,,,I have read that I may find a RED mark on the gear drive,any suggestions advice re. this also welcomed. The bike has a good turn of speed and never ceases to amaze me when I "blip" the throttle to overtake so perhaps the original tuning mods., have been done. Bungo
I was considering buying & installing and Andrews Cam Kit & Adjustable Pushrod Kit. Any advice,recommedations & suggestions greatly appreciated.
Also,,,I have read that I may find a RED mark on the gear drive,any suggestions advice re. this also welcomed. The bike has a good turn of speed and never ceases to amaze me when I "blip" the throttle to overtake so perhaps the original tuning mods., have been done. Bungo
Outstanding HDF Member
Joined: Mar 2010
Posts: 2,877
Likes: 2
From: Hallsville, Tx.
It might be wise to figure out exactly what's been done to your motor before selecting a different cam. Others here know more than me about how higher compression can cause detonation problems with certain cams. You said that the heads have been shaved and that raises compression. How much material has been shaved off and the thickness of the head gaskets all have an effect on compression ratio. I think that you'll need to do some measuring and calculating to figure out your ratio before you can know what's the best performance mods.
Club Member
Joined: Jun 2007
Posts: 3,193
Likes: 7
From: North Atlanta Area, GA
Hold on a minute there! What model of bike do you have, and why are you looking to replace your cam if you like the performance it gives already? You need to know what cam your bike has in it first... that will give you an understanding of your current performance with that cam.
You also need to think about what you are trying to accomplish by changing your cam... are you trying to improve low-end torque, mid-range, or top-end horsepower? Different objectives require very different cams!
You do need to know how much your heads have been milled to figure out your static compression ratio. Don't make the mistake of just buying some cam kit and sticking it in your bike and expecting it to improve things. Depending on the cam you select, you might get much worse performance than you have now.
And your bike likely already has adjustable pushrods if it has an aftermarket cam in it. Most people install a cam using adjustables so the rocker covers don't have to come off. But if you bike has milled heads, the cam might have been put in at the same time, so you might not have adjustables already. Unsnap one of the pushrod cover retainer clips and lift up the lower rod cover tube, and you'll see whether your rods are adjustable or not.
You also need to think about what you are trying to accomplish by changing your cam... are you trying to improve low-end torque, mid-range, or top-end horsepower? Different objectives require very different cams!
You do need to know how much your heads have been milled to figure out your static compression ratio. Don't make the mistake of just buying some cam kit and sticking it in your bike and expecting it to improve things. Depending on the cam you select, you might get much worse performance than you have now.
And your bike likely already has adjustable pushrods if it has an aftermarket cam in it. Most people install a cam using adjustables so the rocker covers don't have to come off. But if you bike has milled heads, the cam might have been put in at the same time, so you might not have adjustables already. Unsnap one of the pushrod cover retainer clips and lift up the lower rod cover tube, and you'll see whether your rods are adjustable or not.
Road Master
Joined: May 2010
Posts: 931
Likes: 112
From: Oregon
Hold on a minute there! What model of bike do you have, and why are you looking to replace your cam if you like the performance it gives already? You need to know what cam your bike has in it first... that will give you an understanding of your current performance with that cam.
You also need to think about what you are trying to accomplish by changing your cam... are you trying to improve low-end torque, mid-range, or top-end horsepower? Different objectives require very different cams!
You do need to know how much your heads have been milled to figure out your static compression ratio. Don't make the mistake of just buying some cam kit and sticking it in your bike and expecting it to improve things. Depending on the cam you select, you might get much worse performance than you have now
And your bike likely already has adjustable pushrods if it has an aftermarket cam in it. Most people install a cam using adjustables so the rocker covers don't have to come off. But if you bike has milled heads, the cam might have been put in at the same time, so you might not have adjustables already. Unsnap one of the pushrod cover retainer clips and lift up the lower rod cover tube, and you'll see whether your rods are adjustable or not.
You also need to think about what you are trying to accomplish by changing your cam... are you trying to improve low-end torque, mid-range, or top-end horsepower? Different objectives require very different cams!
You do need to know how much your heads have been milled to figure out your static compression ratio. Don't make the mistake of just buying some cam kit and sticking it in your bike and expecting it to improve things. Depending on the cam you select, you might get much worse performance than you have now
And your bike likely already has adjustable pushrods if it has an aftermarket cam in it. Most people install a cam using adjustables so the rocker covers don't have to come off. But if you bike has milled heads, the cam might have been put in at the same time, so you might not have adjustables already. Unsnap one of the pushrod cover retainer clips and lift up the lower rod cover tube, and you'll see whether your rods are adjustable or not.
Not trying to sound like some know-it-all but some investigation as to what you have already may be helpful. I love messin with cams personally but to be honest..........I really like exactly what I have now, stock cam, stock timing, good performance. My '98 is fast enuf for me, but then..........I'm low & slow.....unless I'm ridin with my buds.
Seasoned HDF Member
Joined: May 2008
Posts: 21,173
Likes: 12,740
From: South Carolina
Original cam bearing in `91 was Torrington.
Thread Starter
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Road Captain
Joined: Nov 2009
Posts: 737
Likes: 4
From: Scotland,UK
It might be wise to figure out exactly what's been done to your motor before selecting a different cam. Others here know more than me about how higher compression can cause detonation problems with certain cams. You said that the heads have been shaved and that raises compression. How much material has been shaved off and the thickness of the head gaskets all have an effect on compression ratio. I think that you'll need to do some measuring and calculating to figure out your ratio before you can know what's the best performance mods.
Last edited by BungoBill; Jul 20, 2010 at 05:10 PM.
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Yes. I'd still replace it,with 58,000 miles on it.
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Thread Starter
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Road Captain
Joined: Nov 2009
Posts: 737
Likes: 4
From: Scotland,UK
This is definitely the crux of the matter. Everything NG Hawg said applies, as I know from hot rodding. Different cams behave as designed. What are you trying to accomplish? Sound, torque, low end, high end performance???
Not trying to sound like some know-it-all but some investigation as to what you have already may be helpful. I love messin with cams personally but to be honest..........I really like exactly what I have now, stock cam, stock timing, good performance. My '98 is fast enuf for me, but then..........I'm low & slow.....unless I'm ridin with my buds.
Not trying to sound like some know-it-all but some investigation as to what you have already may be helpful. I love messin with cams personally but to be honest..........I really like exactly what I have now, stock cam, stock timing, good performance. My '98 is fast enuf for me, but then..........I'm low & slow.....unless I'm ridin with my buds.
I am not changing anything (cams p.rods etc) right now. I am happy with the performance but with the bike showing a reasonably moderate - high mileage Im thinking about the Cam.,followers,P.Rods,etc.,etc., perhaps already having signs of wear and Im preparing the "ground" for advice when I strip the Cam etc down.. Definitely NOT looking for more performance as the old (91 evo)engine bottom end probably wouldnt take too much in the way of tuning. On the subject of Q.A.Pushrods.... I dont know when/if any of the mods.ie. Head Skim,Perf.Cam and other stuff was ever done,so,as you guys suggest...a strip down is a good idea.
Allegedly...The bike originally (new) belonged to an H.D Bike Shop owner and l was told by the guy I bought it from that he was at a local HD Rideout when the wrench/mechanic who originally worked on the bike told him about the mods but wasnt specific about the fine details of the work done.Bungo.
Thread Starter
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Road Captain
Joined: Nov 2009
Posts: 737
Likes: 4
From: Scotland,UK
Hi Dan, Yeah,im sure I will be replacing cam etc. after stripping & figuring what has been done. Was the "Torrington" Cam reliable in its day? Is it still available or do most guys fit a late model Cam.?.
I am sure you guys know the feeling when you have bought an older (91 Ultra 58,000 mile) machine......you really want to know exactly what condition the engine is in. It gives you a load more confidence when going on long rides.Bungo
I am sure you guys know the feeling when you have bought an older (91 Ultra 58,000 mile) machine......you really want to know exactly what condition the engine is in. It gives you a load more confidence when going on long rides.Bungo