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Post by Mr Kipling on Apr 4, 2018 20:36:29 GMT 1
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Post by ypvs400 on Apr 4, 2018 20:43:27 GMT 1
I have never been able to understand the appeal for these kits, all that cash for an extra 45cc and you no longer have the power valves. Each to their own I suppose |
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Post by Mr Kipling on Apr 4, 2018 20:49:16 GMT 1
I,m building a 443 without valves should give stomping amounts of midrange Grunt , that last word is THE appeal of the kits...
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Post by lolly on Apr 4, 2018 22:14:19 GMT 1
I know the seller , he is a forum member , decent bloke
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Post by marsbar350 on Apr 4, 2018 23:04:38 GMT 1
I have never been able to understand the appeal for these kits, all that cash for an extra 45cc and you no longer have the power valves. Each to there own I suppose If you haven't got original barrels this is a cheaper option |
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Post by JonW on Apr 4, 2018 23:29:41 GMT 1
These cost about that in USD on ebay, or they used to... (I just looked, yeah they used to...) The appeal is also that if you need cyls and a rebore on the cyls you buy (with new pistons) then these are usually cheaper - I did a price breakdown on my website in the big bore primer. Anyway, I guess really if you dont see the appeal after reading the forum then you probably wont be convinced by those who have them. Thats ok, each to their own.  |
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Post by beardy on Apr 5, 2018 7:41:19 GMT 1
I have never been able to understand the appeal for these kits, all that cash for an extra 45cc and you no longer have the power valves. Each to there own I suppose getting rid of the valves turns it back into a proper two stroke |
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Post by earthman on Apr 5, 2018 7:51:58 GMT 1
Out of interest, would this kit fit a 4LO? Or is there another kit that's been designed for that model??
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Post by JonW on Apr 5, 2018 8:14:37 GMT 1
no... and no.
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Post by ypvs400 on Apr 5, 2018 8:17:02 GMT 1
I have never been able to understand the appeal for these kits, all that cash for an extra 45cc and you no longer have the power valves. Each to there own I suppose getting rid of the valves turns it back into a proper two stroke And no longer a YPVS  |
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Post by Norbo on Apr 5, 2018 8:17:46 GMT 1
No it wont fit a $LO sorry
Yes i all so know a bloke the same bloke who does get 103BHP from his bike . But i would not recommend it your better of sticking to it standard.
This is cheep he is again correct they do normaly sell for just under a grand . I do them at £750 but then i do them very cheep so this kit is a bargen .
Not having the valves is not a set back they perform great and give a good kick in the pants when in the band. keeping it %100 standard with no tuning just ignition carbs and pipes you would get a good 80 to 85 BHP with the 4mm stroker crank and keep it reliable .
If your looking for an up grade id get this kit its a good price and even if you dont fit the 4mm crank and keep it just under 400cc not a 421 you will still get good bhp and far more power then the stock ypvs
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Post by ypvs400 on Apr 5, 2018 8:29:15 GMT 1
I hear what people are saying and I know its taking the post off topic but 2Moto have built a YPVS engine that has been bored and stroked to around 400cc and it has 85 bhp based on the stock YPVS cylinders and retains the power valves, that keeps the engine a YPVS My YPVS 400 race bike had wins the the CRMC unlimted class (not with me on it) and pulled like a steam train when I took it for a play at Donington/Cadwell. |
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Post by muttsnuts on Apr 5, 2018 8:40:22 GMT 1
Out of interest, would this kit fit a 4LO? Or is there another kit that's been designed for that model?? nope, don't fit the LC (4L0) engine and nothing out there either I am afraid |
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Post by earthman on Apr 5, 2018 10:42:52 GMT 1
Out of interest, would this kit fit a 4LO? Or is there another kit that's been designed for that model?? nope, don't fit the LC (4L0) engine and nothing out there either I am afraid I wonder why that's the case then? Surely there's a market for them?? |
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Post by johnlam on Apr 5, 2018 11:30:56 GMT 1
Yamaha off roader banshee uses ypvs,this is the market for all the kits not our two wheelers.That they fits is just lucky (if you want one that is).John
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Post by JonW on Apr 5, 2018 12:59:10 GMT 1
The 4L0 market is miniscule compared t the banshee.
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Post by jessy03 on Apr 5, 2018 13:35:27 GMT 1
If you go 421 with this kit you will probably need different domes and better Pistons
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Post by JonW on Apr 5, 2018 22:45:03 GMT 1
Youre right, you will.
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Post by beardy on Apr 6, 2018 7:20:53 GMT 1
really interesting thread. making me think. i like my lc but not a fan of the pv. but a pv lump with one of these kits, mmmm more thinking.
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horace
Thrash Merchant
Posts: 456
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Post by horace on Apr 6, 2018 7:47:54 GMT 1
I’ve just fitted one to my valve , needed top end doing anyway which made it a no brainier,didn’t see point in doing crank just wanted to bolt straight on and ride with confidence, v force 4 reeds , kr1s copy carbs , pod filters and bigger rad ,really pleased with power and no more leaky dirty ypvs! Win win.
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Post by earthman on Apr 6, 2018 7:50:33 GMT 1
really interesting thread. making me think. i like my lc but not a fan of the pv. but a pv lump with one of these kits, mmmm more thinking. What don't you like about the pv's then? I've never had one, the earlier ones just don't appeal to me to be honest, I can see attraction in the full fairing models though,....maybe it's just because I lusted after one in my youth. Still very happy that I followed my heart and bought a 4LO again. |
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Post by dusty350 on Apr 6, 2018 7:58:29 GMT 1
I think that's a very fair price. When you consider what a top end rebuild on a standard engine would cost with rebore, pistons, gaskets etc. A billet head will cost you £250 on it's own. Sure you will need to sort your pipes, inlets etc, but most of us do that anyway. I would certainly consider it next time I rebuild a pv Dusty |
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Post by JonW on Apr 6, 2018 8:29:39 GMT 1
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Post by Norbo on Apr 6, 2018 9:04:14 GMT 1
If you go 421 with this kit you will probably need different domes and better Pistons This is correct . this kit is a standard fit and ride to the stock bottom end/ to use a 4mm crank you would need to replace the pistons and re do the domes . still a real bargain |
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Post by srhiskx on Apr 6, 2018 15:31:12 GMT 1
I might be mistaken, but I think you can get a 4mm crank with either 110 rods or 115 rods. The 110's I think you run Stock Pistons and no head mods, the 115's need different Pistons and head mods. I think Roger @ Wicked built a motor using 110 4 mill crank and got good hp out of it. Mid 70s on ported stock cylinders.
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Post by Mr Kipling on Apr 6, 2018 17:01:48 GMT 1
I might be mistaken, but I think you can get a 4mm crank with either 110 rods or 115 rods. The 110's I think you run Stock Pistons and no head mods, the 115's need different Pistons and head mods. I think Roger @ Wicked built a motor using 110 4 mill crank and got good hp out of it. Mid 70s on ported stock cylinders. yeah he did but its not really worth it IMO , might as well do the whole package +4 n offset pistons mod the head jobs a good in ,but that's just my honest opinion... |
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Post by JonW on Apr 6, 2018 22:48:09 GMT 1
Roger did a very standard build (its on the RDRZ500 forum) to show what you can get with almost no mods, and even used the OEM carbs. It was throwing bhp away really, but it was very cheap to do.
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Post by jon on Apr 7, 2018 6:38:19 GMT 1
I’m assumining the kit is optimised for a standard length crank.
When using a +4 crank obviously the domes need deepening to accomodate the extra 2mm throw at TBC.
However at BDC the piston will be 2mm below the floor of the ports. Now I know this will have little effect, but not ideal. Also by porting the cylinders and dropping the floor, are the port sizes took big? Also is porting. After nicasil OK, or is it likely to peel away from the ports?
Jon
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Post by fozzy17 on Apr 7, 2018 7:42:16 GMT 1
can you get away with stock exhaust headers? just noticed they are different
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Post by Mr Kipling on Apr 7, 2018 9:20:34 GMT 1
can you get away with stock exhaust headers? just noticed they are different no .. |
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