Fitting later model cams to a curvy. - SV650.org

29-03-07, 01:57 PM

Ok I am getting impatient about trying to source just a set of pointy cams to put in my curvy to up its power … I was therefore thinking of buying a complete (and working) Pointy engine, robbing the cams etc and then putting the bits out of my curvy motor back into it to make a complete engine again … then sell it back on, hopefully for the greater part of what I paid (Disclosing it has had a cam change obviously!!).

Before I go down this route, does anyone know of any reasons why fitting early model cams to a later model bike might be detrimental to the running?!!? If it drops a couple of hp, who cares, but it will still run nicely right?!!?

Also so I don’t have to dredge through old posts, when fitting later cams to earlier bike do the timing marks stay the same?? I am talking inlet to inlet, exhaust to exhaust BTW, I know they are different if you swap inlet to exhaust etc.

Biker Biggles · 29-03-07, 05:44 PM

Seems a bit drastic.Have you not been able to find a pointy engine that has done a big end?We keep hearing about people who forget to top up their oil and have this happen so there should be some available.

29-03-07, 07:20 PM

Quote:

Originally Posted by Biker Biggles

Seems a bit drastic.Have you not been able to find a pointy engine that has done a big end?We keep hearing about people who forget to top up their oil and have this happen so there should be some available.

One of the first things that would be rogered if the engine died due to oil starvation is the cams ... so I rule them out instantly ...

With this in mind, I am looking for one that threw a rod or piston went etc or had a serious gearbox problem ... but there aren't many of them

northwind · 30-03-07, 01:05 PM

You could be surprised with the oil-loss engines, SV bottom ends tend to go pretty fast even when there's still some oil floating about... I've seen oil starved bottom ends with perfect tops. But it's a gamble...

The Vstrom engine has cams that are, I think, more restrictive than the curvy ones and that's otherwise an injected SV engine, right?

northwind · 30-03-07, 01:18 PM

Oh yes... there's all sorts or dishonest ways to get a set of cams froma later model, I'm very proud of you all for not thinking of them

30-03-07, 03:11 PM

Quote:

Originally Posted by northwind

Oh yes... there's all sorts or dishonest ways to get a set of cams froma later model, I'm very proud of you all for not thinking of them

If I could see the cams first then fine, but to take an unopened lump on and pay money and travel for it would be foolhardy

yes unfortunately I am a honest person, at times I wish I wasn't

Rang Suzuki ... a set of NEW 05 cams are £400 ... so that's not an option ... I can buy a full working motor from a breakers for less than that ...

northwind · 01-04-07, 10:33 PM

£400! From a K3 (exact same spec) I paid £126 for my intakes.

01-04-07, 11:18 PM

HAHAHA......I let my SV run low on oil. The shell bearings melted and i scored the crank real bad. £450 for a 1500 mile engine. Lesson is, check your oil!

johnnyrod · 07-04-07, 10:18 PM

Yep as Northy says, you only need the intakes, then use your old intakes on the exhaust side. This business of replacing them all, new buckets etc. just isn't necessary unless you've put loads of miles on it and started wearing things. You'll have to time the exhausts yourself but it isn't hard with some patience and there are reasonable to good photos on svrider.

northwind · 07-04-07, 10:57 PM

Blue's going minitwinning so he's not allowed to do the in/in mod, he has to keep some sort of ex cam in the ex slot. Which is a shame

29-03-07, 01:57 PM	#1
Blue_SV650S Guest Posts: n/a	Fitting later model cams to a curvy. Ok I am getting impatient about trying to source just a set of pointy cams to put in my curvy to up its power … I was therefore thinking of buying a complete (and working) Pointy engine, robbing the cams etc and then putting the bits out of my curvy motor back into it to make a complete engine again … then sell it back on, hopefully for the greater part of what I paid (Disclosing it has had a cam change obviously!!). Before I go down this route, does anyone know of any reasons why fitting early model cams to a later model bike might be detrimental to the running?!!? If it drops a couple of hp, who cares, but it will still run nicely right?!!? Also so I don’t have to dredge through old posts, when fitting later cams to earlier bike do the timing marks stay the same?? I am talking inlet to inlet, exhaust to exhaust BTW, I know they are different if you swap inlet to exhaust etc.

29-03-07, 05:44 PM	#2
Biker Biggles Member Mega Poster Join Date: Jan 2005 Location: Barnet Herts Posts: 5,071	Re: Fitting later model cams to a curvy. Seems a bit drastic.Have you not been able to find a pointy engine that has done a big end?We keep hearing about people who forget to top up their oil and have this happen so there should be some available. __________________ On a clear day we stand there and look further than the ordinary eye can see.

30-03-07, 01:05 PM	#4
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	Re: Fitting later model cams to a curvy. You could be surprised with the oil-loss engines, SV bottom ends tend to go pretty fast even when there's still some oil floating about... I've seen oil starved bottom ends with perfect tops. But it's a gamble... The Vstrom engine has cams that are, I think, more restrictive than the curvy ones and that's otherwise an injected SV engine, right? __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

30-03-07, 01:18 PM	#5
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	Re: Fitting later model cams to a curvy. Oh yes... there's all sorts or dishonest ways to get a set of cams froma later model, I'm very proud of you all for not thinking of them __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

01-04-07, 10:33 PM	#7
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	Re: Fitting later model cams to a curvy. £400! From a K3 (exact same spec) I paid £126 for my intakes. __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

01-04-07, 11:18 PM	#8
skulpt Guest Posts: n/a	Re: Fitting later model cams to a curvy. HAHAHA......I let my SV run low on oil. The shell bearings melted and i scored the crank real bad. £450 for a 1500 mile engine. Lesson is, check your oil!

07-04-07, 10:18 PM	#9
johnnyrod Member Mega Poster Join Date: Jul 2003 Location: Doncaster, oop norf Posts: 2,128	Re: Fitting later model cams to a curvy. Yep as Northy says, you only need the intakes, then use your old intakes on the exhaust side. This business of replacing them all, new buckets etc. just isn't necessary unless you've put loads of miles on it and started wearing things. You'll have to time the exhausts yourself but it isn't hard with some patience and there are reasonable to good photos on svrider.

07-04-07, 10:57 PM	#10
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	Re: Fitting later model cams to a curvy. Blue's going minitwinning so he's not allowed to do the in/in mod, he has to keep some sort of ex cam in the ex slot. Which is a shame __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

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