holtshot
Velociraptor
Posts: 35 
Bikes: bandit 1200
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Post by holtshot on Jul 30, 2014 20:43:43 GMT
Hi,i heard that its possible to convert the shim type heads to use the forked rockers and cams.Has anyone done this and know whats involved?Thanks
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Post by katana on Jul 30, 2014 21:57:08 GMT
PITA to do with no real benefits unless its a really extreme engine that will benefit from the better port shape!
You have to get replacement cams, valves, springs and all the rocker gear and then space it all out, usually with solid spacers, so its costly as well!
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holtshot
Velociraptor
Posts: 35
Bikes: bandit 1200
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Post by holtshot on Jul 30, 2014 22:10:18 GMT
Well as you point out indeed PITA unless its for a really extreme engine,it is and thats exactly why im asking  .So spill them beans! valve stem lengths any different from other models?I was wonderingif theywere long like the slingshot,(will check part #s if no one knows.It appears that the springs,retainers and bases will fit from the earlier rocker types,i believe theres somthing needs to be done to line the end float of thecams? Itd be helpfull if someones done this and explains or else i will just have to get stuck in.I have a BRAND new slingshot head and am building a flow bench but if im going to that trouble maybe i should start with the m head.Thanks |
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Post by kokolis on Jul 31, 2014 10:37:31 GMT
Why converting if you can buy one, is a bolt on job.
Converting will cost you more than an engine
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holtshot
Velociraptor
Posts: 35
Bikes: bandit 1200
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Post by holtshot on Jul 31, 2014 12:57:12 GMT
Well it has more potential to flow than any other oilcooled head,but tthey have the danger of spitting shims,you cant get decent performance cams for that reason and i probably already have everything to do it so wont cost much at all.If i am going to put money and time into a head might as well start from the best place?
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holtshot
Velociraptor
Posts: 35
Bikes: bandit 1200
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Post by holtshot on Aug 2, 2014 8:32:44 GMT
Guess I'll know when ive done it then?
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Post by kokolis on Aug 2, 2014 9:26:49 GMT
Still.............you have the danger of spitting shims
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Post by katana on Aug 2, 2014 10:25:16 GMT
Still.............you have the danger of spitting shims Why? 'M' valves are longer than earlier types so have to be also changed to fit under the 'std' adjustable rockers. I guess if you are doing a performance head you'll be changing to larger valves anyway? Personally i'd rather start with a 'L' adjustable type head and gas port it using chemical metal to achieve the port design and up the flow even better than the 'M' design. The short turn radius is where it counts and the M is only slightly better than the L. And in case you are concerned - if done right, chemical metal DOES NOT fall out and wreck engines!  |
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Post by kokolis on Aug 2, 2014 11:49:45 GMT
Still.............you have the danger of spitting shims Why? 'M' valves are longer than earlier types so have to be also changed to fit under the 'std' adjustable rockers. I guess if you are doing a performance head you'll be changing to larger valves anyway? Personally i'd rather start with a 'L' adjustable type head and gas port it using chemical metal to achieve the port design and up the flow even better than the 'M' design. The short turn radius is where it counts and the M is only slightly better than the L. And in case you are concerned - if done right, chemical metal DOES NOT fall out and wreck engines! you are right, I was still in the shims mode |
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holtshot
Velociraptor
Posts: 35
Bikes: bandit 1200
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Post by holtshot on Aug 2, 2014 15:22:14 GMT
Yeh,tis true the epoxy i put in my dot head has stayed intact for the last 3 years ok i just wanted the next head not to have any in.once its in there the future worry is valve guide replacement if its ever needed.so i was going to go the m/n head as you guessed with bigger valves,i think max o/s ex and new seats+31 ish inlets.I was guessing the valves were going to be longer are they the same as the dot ones or longer again?
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Post by jonny1bump on Aug 4, 2014 19:47:11 GMT
Cam side thrust journals lengths are different, you have to weld them up and re machine.
Basically you junk all the m stuff its more involved then you think.
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holtshot
Velociraptor
Posts: 35
Bikes: bandit 1200
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Post by holtshot on Aug 5, 2014 11:40:01 GMT
Has anyone on here actualy done the conversion personaly? ie first hand experience please |
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Post by jonny1bump on Aug 6, 2014 21:40:11 GMT
That's why I've written what I have.
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holtshot
Velociraptor
Posts: 35
Bikes: bandit 1200
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Post by holtshot on Aug 6, 2014 22:40:17 GMT
Ah ok,so with the valves,when you use say the slingshot retainers and spring bases which valves did you use.obviously the slingshot ones are longer than say a bandit but the shim types are different again presumeably due to shim type retainer.So that opens the choice to 3 stem lengths...so which valves did you end up using?Thanks
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Post by jonny1bump on Aug 8, 2014 19:53:12 GMT
Big stainless ones. lol
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.So spill them beans! valve stem lengths any different from other models?I was wonderingif theywere long like the slingshot,(will check part #s if no one knows.It appears that the springs,retainers and bases will fit from the earlier rocker types,i believe theres somthing needs to be done to line the end float of thecams? Itd be helpfull if someones done this and explains or else i will just have to get stuck in.I have a BRAND new slingshot head and am building a flow bench but if im going to that trouble maybe i should start with the m head.Thanks 
