Yamaha 701/760 Freestyle/Freeride porting templates

yamanube

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#62
Thanks for the explanation, it makes a lot more sense to me now. About the Sizzler, so far its working fine and has decent feedback from most, im sure its not as good as a bpipe but its got pretty good bottom end from what I understand, I have no frame of reference however as I have only ridden this superjet with this configuration but it spanks the crap out of my well tuned 650sx. I dried it out a lot and it really livened it up a bit in the midrange and up top without sacrificing much down low. What is your issue with the Coffman? It came with the ski for 500 bucks total, granted I had to rebuild everything, but it was a hell of a jump start.

Thank you for your feedback and I am going to start studying up on porting, looks like I have a winter project.
There's nothing wrong with the Coffman pipe, you just mentioned you where looking for more midrange and there are other pipes that make more power.
 
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#65
There's nothing wrong with the Coffman pipe, you just mentioned you where looking for more midrange and there are other pipes that make more power.
Maybe coming from dirt bikes I have a colored perspective of tuning, I may not have the basics down. Some pipes in the mx world will give you midrange and top end but nuke the bottom, same goes for the bottom end pipes nuking top end. I guess I assumed that going with a midrange/top end pipe I would lose a lot of the bottom end hit this coffman makes, I also assumed that the slightly different port timing of the 62t may liven up the midrange and top end just by its nature.

Bottom line it seems is a decent port job will help any cylinder make power however the ski is still only the sum of its parts. Programmable ignition is an eventuality for me however a rebuild is bound to be in my future as both halves of the engine already had hours on them (62t/61x) so Im planning for an engine rebuild before much else.
 
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#66
Maybe coming from dirt bikes I have a colored perspective of tuning, I may not have the basics down. Some pipes in the mx world will give you midrange and top end but nuke the bottom, same goes for the bottom end pipes nuking top end. I guess I assumed that going with a midrange/top end pipe I would lose a lot of the bottom end hit this coffman makes, I also assumed that the slightly different port timing of the 62t may liven up the midrange and top end just by its nature.

Bottom line it seems is a decent port job will help any cylinder make power however the ski is still only the sum of its parts. Programmable ignition is an eventuality for me however a rebuild is bound to be in my future as both halves of the engine already had hours on them (62t/61x) so Im planning for an engine rebuild before much else.
Beauty of jetskis is you have water injection in most pipes and can tune the pipes how you want them based on how much and where the water is being injected.
 
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#67
I think this would be a lot of fun to try this winter but I need to locate a good stock bore 701 cylinder first (61x I think), so I can keep my original in case I hose something up.
 

yamanube

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#74
Has anyone used these for porting a 760? Wondering how they perform over stock?
We have spoken in PMs but I didn't want to leave this hanging in the conversation here. I have ported a couple of 760 cylinders with this and they have run very well. The only difference in the 64X 760 cylinder is my template hangs down into the exhaust port slightly because this cylinder has a taller port than the 62T 701 or 61X cylinder. I was making a template specifically for this at first but decided it was unnecessary and simple enough to blend the top corners in.
 
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#75
We have spoken in PMs but I didn't want to leave this hanging in the conversation here. I have ported a couple of 760 cylinders with this and they have run very well. The only difference in the 64X 760 cylinder is my template hangs down into the exhaust port slightly because this cylinder has a taller port than the 62T 701 or 61X cylinder. I was making a template specifically for this at first but decided it was unnecessary and simple enough to blend the top corners in.
I would like to purchase one of these templates. Can you you please send me a PM. I am new to the site so I can't message yet. Thanks
 
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#76
I'm new to the site and can't message like the person above. I tried sending an email to the address you listed on the first post on this thread but haven't heard back. I'd like to purchase a kit for a 701 if you still have them.
 
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