SV Talk, Tuning & Tweaking Discussion and chat on all topics and technical stuff related to the SV650 and SV1000 Need Help: Try Searching before posting |
![]() |
|
Thread Tools |
![]() |
#1 |
Guest
Posts: n/a
|
![]()
i have an 02 sv650s, bmc filter (205/10?), and a full yoshi exhaust system. (installed by the previous owner, i dotn know if he re-jetted after installation)
the mechanic says i should re-jet my bike, but wants 300$ that i dont have ![]() is there a easy indicator of whether i need to a re-jet or not? edit: i've read that when the exhaust is cold, and there is black residue on the inside tip of the exhaust can (which there is), it usually means that its running rich what are the harms of not re-jetting? if i were to buy the kit, would this be it? http://cgi.ebay.com/ebaymotors/New-D...spagenameZWD1V edit: and 300$, alittle costly? thanks in advance Last edited by catchsomesv650; 19-02-09 at 08:53 PM. |
![]() |
![]() |
#2 |
Guest
Posts: n/a
|
![]()
have you done the tank lift yet, this would allow more air to the carbs.
this makes a differance on it's own. i'm sure rejetting would not be necessary, unless you want preformace. |
![]() |
![]() |
#3 |
Guest
Posts: n/a
|
![]()
There is always a bit of black dirt on the exit of the exhaust....right? I've always noticed it. Otherwise my bike is running rich. Which wouldnt suprise me, the air filter has never been changed to my knowledge
![]() ![]() ![]() |
![]() |
![]() |
#4 | |
Guest
Posts: n/a
|
![]() Quote:
there are two, what looks like, really thick washers that do prop up the tank by like an inch or so. like i said, i have no idea whether i need it or not (but i do know its recommended after airfilter/full exhaust, but i dont know if the previous owner did or not) performance isn't that big of a deal. to me, theres no difference between really fast and really really fast. ![]() |
|
![]() |
![]() |
#5 |
Guest
Posts: n/a
|
![]()
one the the best ways to know how your engine is running is to check the plugs. do you have a work shop manual. has good pics to show you how they look rich/poor/ good.
|
![]() |
![]() |
#6 | |
Guest
Posts: n/a
|
![]() Quote:
how does the bike feel? I would say that if you can ride it, then its already been rejetted - maybe not perfectly, but from experience, when i put my BMC Race RS into my curvy (with standard system with a slipon can) it wouldnt even rev above 4k before i rejetted........ by the sounds of it the tank has already been raised (doesnt make a great difference TBH), as said you can tell if your running rich or lean by looking at the spark plugs....... if i were you i would buy mikuni jets....not dynojet kits as they are so cheap (they are what i used and i think(?) the carbs on curvys are also mikuni, i may be wrong tho). standard jets are 37.5 (mikuni sizes, not dynojet sizes, mikuni are the standard ones also) with my slip on and RS filter I found that 155 mikunis was perfect.....as you have a full system yours may need to be bigger (depending on which BMC filter you have).... have you thought about taking the carbs out and having a look at the jets? you will know exactly whats in there then...... |
|
![]() |
![]() |
#7 |
Guest
Posts: n/a
|
![]()
$300 u in the states? is that about £150?
thats well expensive to rejet, a qualified / experienced mechanic could easily do it in an hour.....however if he is talking about running it on the dyno etc and setting it up perfect that that could be where the cost comes into it,.... |
![]() |
![]() |
#8 |
Moderator
Mega Poster
Join Date: Jan 2004
Location: In the garage where I belong
Posts: 17,083
|
![]()
As Dappa D says, there's more than one BMC filter and they're all 205/10
![]() So, let's assume it's the Race. Which is a decent enough filter, but not a particularily free one, so by itself you wouldn't automatically have to rejet. And the Yoshi, well, not the best system ever (though it's OK- Yoshi annoy me, clearly they can make a great system if they choose, which shows that for the SV they just chose not to) so you might be able to get by without rejetting. But with both, it's going to be a good idea, since otherwise you'll be fairly lean. So, let's work from the assumption that it's not been done. It'd make sense to fire it on a dyno tbh, take the guesswork out of the equation. $300 for a full rejet is not too awful but for a fuel run alone, it should be much less and that'll tell you for a fact if it needs fixed. But failing that- the SV has a brilliant lean symptom. Basically, stick it in third, cruise at 5000, 6000 and 7000rpm respectively, then bang the throttle open fast. If it stumbles/stutters before it picks up, chances are it's fairly lean. If it just goes, it's about right. If it "sandbags", ie nothing happens then it slowly picks up, then chances are it's rich. These are all obviously rules of thumb but they can be very helpful.
__________________
"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" |
![]() |
![]() |
![]() |
#9 | |
Guest
Posts: n/a
|
![]()
thank you all for your help, i'll ask around a couple friends to see where they get their re-jetting done and go from there...
Quote:
|
|
![]() |
![]() |
#10 |
Noisy Git
Mega Poster
Join Date: Apr 2007
Location: Halifax/Leeds
Posts: 26,645
|
![]()
When riding normally rpm and speed are kinda related
![]() The shove of power should be instant. Basically does it run like a bag of w4nk or not? If it runs alright chances are it's already been done. Post a pic of the top of the filter you have in there.
__________________
Currently Ex Biker
Now rebuilding a 63' fishing trawler as a dive boat |
![]() |
![]() |
![]() |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
Rejetting question | drag | SV Talk, Tuning & Tweaking | 27 | 24-07-09 10:10 AM |
BMC Race RS / Rejetting question. | Dappa D | SV Talk, Tuning & Tweaking | 81 | 14-09-08 04:44 PM |
Rejetting and such | yorkie_chris | SV Talk, Tuning & Tweaking | 20 | 10-12-07 10:09 PM |
Rejetting | PSU_shamokin | SV Talk, Tuning & Tweaking | 10 | 05-02-05 04:09 AM |
Rejetting | snoopy | SV Talk, Tuning & Tweaking | 1 | 22-01-05 03:45 PM |