Will XJ750 Carbs work on a XJ650?
Groups | Search | About
Login Password
Register Now! Lost Password?

Yamaha Bikes - Yamaha motorcycles discussed here 

Page 1 of 2       1 2 > last >> Bookmark this page:  YahooMyWeb Yahoo!  Google Google  Windows Live Favorites Windows Live  del.icio.us del.icio.us  digg digg  Add to Netscape Netscape
Subject Author Date
Will XJ750 Carbs work on a XJ650? noreply 08-16-2007
If you were  Registered and logged in, you could reply and use other advanced thread options
Posted by on August 16, 2007, 7:33 pm
Will carbs from a 1982 XJ650 work on a 1982 XJ650? Is the carb body the
same? I figure I need to check all the jet sizes and so forth...

Thanks,

Kyle

Posted by Albrecht via MotorcycleKB.com on August 17, 2007, 1:13 pm
noreply@noreply.com wrote:
>Will carbs from a 1982 XJ650 work on a 1982 XJ650?

Yes. ;-)

But your subject line asks a different question.

>Is the carb body the
>same?

They seem to be very similar. Is the XJ750 a bored out XJ650?

In that case the carburetor spacing would probably be the same. The typical
spacing of carbs on an I-4 is that the pairs of carbs on left and right are
close together and there is a larger space between pairs.

You can shoe horn carbs into place even if the spigots are larger and the
spacing is off by 2mm or so because the rubber boots will yield to force and
lubrication.

http://www.powersportspro.com/pages/parts/home.aspx

XJ750:

Carburetor Ass'Y 1 (15r-14901-00) 1 --
3 Carburetor Ass'Y 2 (15r-14902-00) 1 --
4 Carburetor Ass'Y 3 (15r-14903-00) 1 --
5 Carburetor Ass'Y 4 (15r-14904-00


XJ650:

2 Carburetor Ass'Y 1 (5n8-14901-00) 1 --
3 Carburetor Ass'Y 2 (5n8-14902-00) 1 --
4 Carburetor Ass'Y 3 (5n8-14903-00) 1 --
5 Carburetor Ass'Y 4 (5n8-14904-00)

I dunno if "15r" and "5n8" are just some Powersportspro model designator or
what?

> I figure I need to check all the jet sizes and so forth...

http://www.powersportspro.com/pages/parts/home.aspx

--
Message posted via MotorcycleKB.com
http://www.motorcyclekb.com/Uwe/Forums.aspx/yamaha/200708/1


Posted by on August 17, 2007, 1:21 pm
wrote:
>noreply@noreply.com wrote:
>>Will carbs from a 1982 XJ650 work on a 1982 XJ650?
>
>Yes. ;-)
MAYBE-if you rejet correctly and the volumetric flow is adequate.
it will not be bolt and go.
>
>But your subject line asks a different question.
>
>>Is the carb body the
>>same?
>
>They seem to be very similar. Is the XJ750 a bored out XJ650?
no.


>
>In that case the carburetor spacing would probably be the same. The typical
>spacing of carbs on an I-4 is that the pairs of carbs on left and right are
>close together and there is a larger space between pairs.
>
>You can shoe horn carbs into place even if the spigots are larger and the
>spacing is off by 2mm or so because the rubber boots will yield to force and
>lubrication.
>
>http://www.powersportspro.com/pages/parts/home.aspx
>
>XJ750:
>
>Carburetor Ass'Y 1 (15r-14901-00) 1 --
>3 Carburetor Ass'Y 2 (15r-14902-00) 1 --
>4 Carburetor Ass'Y 3 (15r-14903-00) 1 --
>5 Carburetor Ass'Y 4 (15r-14904-00
>
>
>XJ650:
>
>2 Carburetor Ass'Y 1 (5n8-14901-00) 1 --
>3 Carburetor Ass'Y 2 (5n8-14902-00) 1 --
>4 Carburetor Ass'Y 3 (5n8-14903-00) 1 --
>5 Carburetor Ass'Y 4 (5n8-14904-00)
>
>I dunno if "15r" and "5n8" are just some Powersportspro model designator or
>what?
>
> > I figure I need to check all the jet sizes and so forth...
>
>http://www.powersportspro.com/pages/parts/home.aspx
>

Posted by on August 18, 2007, 10:27 am
Thanks.

Sorry about the typo - I meant to ask if XJ750 carbs would work on a XJ650,
and if the carb body's are the same.

I have a XJ650 that I can't get to start well. I've cleaned the carbs
numerous times. I know it is the carbs, because I have put a set on from a
friends XJ650 and it ran great. I am looking at a used set of XJ750 carbs
on e-bay and was wondering if I could use those.

Thanks again.

Kyle

Posted by Albrecht via MotorcycleKB.com on August 18, 2007, 12:28 pm
noreply@noreply.com wrote:

>I have a XJ650 that I can't get to start well. I've cleaned the carbs
>numerous times. I know it is the carbs, because I have put a set on from a
>friends XJ650 and it ran great. I am looking at a used set of XJ750 carbs
>on e-bay and was wondering if I could use those.

Well, it sounds like you might have some gum and varnish in the idle ports
and passages.

I won't go deep into telling you how to clean those passages out, because
I've typed it out a few hundred times and posted it in rec.motorcycles.tech.

What you need to know is that the starting enrichener won't work unless the
throttle butterflies are almost completely closed. And, if you have dirty
passages inside your carbs, you have probably turned the idle speed knob to
get the engine to idle.

So, you've unknowingly sabotaged your carburetors.

--
Message posted via http://www.motorcyclekb.com


Page 1 of 2       1 2 > last >>
Similar ThreadsPosted
irratic idle 1983 xj750 seca August 11, 2008, 9:23 am
1980 xj650 forks August 16, 2007, 5:02 pm

Contact Us | Privacy Policy

XML SitemapXML Sitemap