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Carb set up

Old 02-25-2011, 10:01 AM
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Great read... thank you.
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Old 02-25-2011, 10:02 AM
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This is something I'm needing to do. I better get it done before it gets nice out.
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Old 02-27-2011, 07:08 PM
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Originally Posted by 7moore7 View Post
Better?



haha

And yeah, the mains had a star on them.
Just gotta wait for the tank to get back from paint and leave for a buddy's wedding, then I'll be able to give this setup a shot.
That is perfect.....
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Old 03-14-2011, 04:24 AM
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Nice thread

Until now, I never checked the insides of the carburators, but I found out that all jets are stock (178/175 main, 45S pilot). That's where my question comes in: Is there any difference between pilot jet 45 and 45S (and 48 and 48S)?

Last edited by Tiez; 03-14-2011 at 12:09 PM.
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Old 03-14-2011, 07:12 AM
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Pilot jets are often reffered to as "Slow Jet", hence the "S" which makes more sense than trying to write the whole thing out... So, no there's no difference...
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Old 03-14-2011, 08:02 AM
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Thanks! I already thought it must have been something like that. Nice to know fo sho tho
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Old 03-30-2011, 12:19 PM
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i fitted a dj kit to mine with a bmc filter, drilled the slides & fitted the lighter diaphragm springs supplied in the kit.
result??? it ran like a bag of crap lol.
the slides were lifting way too early, meaning it was coming on the main jet at like 4500 rpm when it should just be lifting and still on the needles.

the result on the road felt wierd, like it was bogging down but taking off like mad once it hit 7k.
as i'd just fitted different cams, i thought that was the cause until i put it on a dyno, then the cause became obvious.
i refitted a new set of eom diaphragm springs and filled the hole in the slides by superglueing a small piece of o ring in the hole.
currently im running 185 / 190 mains with 50 pilots and it runs great!

just to say really, get a fuelling run done before you make adjustments.
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Old 04-04-2011, 01:02 PM
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After fitting the 48 pilot jets and shimming the needles, my bike is still running lean @higher rpm. Now I didn't really pay attention when removing and reinstalling the (K&N) air filter, but today I spotted the following (rotten quality picture ):



That's different from 7moore7's pics, where the top right and bottom left segments are covered by foam (or something?), except of course for the holes that are connected with the two hoses. Could that make my bike get too much air??
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Old 04-04-2011, 01:07 PM
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That K&N filter will have MUCH more effect on airflow than those little breather hose holes. A stock filter is more restrictive and as a general rule easier to tune on the VTR. The foam covers are just filters, order new ones when you get the chance.
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Old 04-04-2011, 01:22 PM
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As 7moore7 has pointed out, "the top right and bottom left segments are covered by foam [filters]" and it's important to replace the missing items. However, if you continue to use the K+N filter, the small foam filters will be sucked into the motor. The K+N filter requires separate covers that keep the foam filters where they ought to be. The stock filter and the BMC street filter don't require separate covers. So, if you're going to continue to use the K+N, get the covers.
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Old 04-04-2011, 01:54 PM
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Thanks!

Nice, I already found the needed parts of foam and the covers What happened? I bought my bike with the K&N filter already in place, but replaced it with the stock filter. Some time ago, when I brought my Firestorm to a local bikestore for some maintenance, they thought it was a good idea to put the K&N in again. So I brought them the filter element, but forgot all about the covers!

So my bad, but also not very alert of the mechanic who placed the filter.

Last edited by Tiez; 04-04-2011 at 02:07 PM.
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Old 04-07-2011, 03:11 PM
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I just performed slide mod, shimed needles and installed #48 pilot jets on my 04 and still have a large hole in powerband. Right around 3k-5k rpm hesitates and all but dies performance wise. I have d&d pipes and a k&n Any ideas???
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Old 04-07-2011, 04:02 PM
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Originally Posted by Dan C View Post
I just performed slide mod, shimed needles and installed #48 pilot jets on my 04 and still have a large hole in powerband. Right around 3k-5k rpm hesitates and all but dies performance wise. I have d&d pipes and a k&n Any ideas???
Yes... Combine K&N filter with lighterfluid and a match...
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Old 04-07-2011, 05:06 PM
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Those were my thoughts as well! Gonna buy stock filter and try again
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Old 04-07-2011, 07:14 PM
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Originally Posted by Tweety View Post
Yes... Combine K&N filter with lighterfluid and a match...
K&N filters just don't work IMHO but I will make note of using the stock filter & air box in the first post
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Old 04-07-2011, 11:29 PM
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Back in about 2005 we had a customer bring a late model Mustang V8 into the school shop for diagnosis, due to a "check engine" light. The code indicated an O2 sensor problem. Long story short, on the 3rd visit, unable to solve the problem, I called the Ford dealer for technical assistance. When I told him that it had a K&N, he said, "When a car comes into the dealer with a K&N, we tell them we won't work on it unless they let us put a stock air filter and housing back on it".

As it turned out, the oil from the K&N had contaminated the MAF sensor, tricking the ECM into thinking less air was entering the intake. Of course that wouldn't affect a Superhawk, but I've never been a fan of K&N's either. Plus most people that have one don't maintain it properly.
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Old 04-08-2011, 05:34 AM
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Had a question about shims i installed two #4 washers in rear carb leaving stock washer as well.As for the front i removed the stock shim and added two #4 washers. So thats 3 shims in back and 2 shims up front. did i perform this properly?
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Old 04-08-2011, 10:45 AM
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Originally Posted by Dan C View Post
Had a question about shims i installed two #4 washers in rear carb leaving stock washer as well.As for the front i removed the stock shim and added two #4 washers. So thats 3 shims in back and 2 shims up front. did i perform this properly?
Yes you did.....
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Old 04-08-2011, 11:02 AM
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Close enough for the girls we go out with...
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Old 04-08-2011, 11:38 AM
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Originally Posted by 8541Hawk View Post
Yes you did.....
Thanks
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Old 04-09-2011, 05:12 PM
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I just realized I too have 45s jets installed, and in my old HRC RC31 jet kit I have two Keihin 45, no "s". They appear to be identical with the only difference being the "s". From your explanation I assume they're just from different years or production runs? Just curious if you know.

Mike

Anyone?

Last edited by afm528; 04-13-2011 at 01:11 AM. Reason: bump
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Old 04-16-2011, 07:31 AM
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Still working on the set-up I was wondering: when you say 'start with the pilot screw set at 2 1\4 turns' does that mean 2 1/4 x 360 degrees? or 2 1/4 x 180 degrees?

This popped my mind when I was overthinking if I didn't make any translation mistakes (in Dutch we use 'slag' for 'turn' and a 'slag' is 360 degrees...)

Well, just to make sure..
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Old 04-16-2011, 08:41 AM
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Originally Posted by Tiez View Post
Still working on the set-up I was wondering: when you say 'start with the pilot screw set at 2 1\4 turns' does that mean 2 1/4 x 360 degrees? or 2 1/4 x 180 degrees?

This popped my mind when I was overthinking if I didn't make any translation mistakes (in Dutch we use 'slag' for 'turn' and a 'slag' is 360 degrees...)

Well, just to make sure..
360.. 180 would be half a turn.
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Old 04-16-2011, 09:47 AM
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Just as I thought
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Old 04-16-2011, 10:53 AM
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did this set up after reading the thread. havent been able to ride much since but so far seem very good. much smoother and better response.
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Old 04-17-2011, 08:06 AM
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Finally got stock filter back in bike wow what a difference! Never would of suspected k&n would have such a negative effect on mid range. Thanks for input!!!
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Old 05-10-2011, 02:53 PM
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Got a '98 VTR with stock carbs.

Installed a set of Yoshimura cans. Bike spits and coughs off of idle when cold started.

Ordered a set of 48 pilots. Looking for some #4 washers.

Will advise on the outcome shortly.

Miguel
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Old 06-14-2011, 01:16 PM
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Originally Posted by 7moore7 View Post
Here's where I found a good price on pilots:

http://www.hollisterhonda.com/eshopp...PILOT_JETS.htm

I think this site came recommended via 8541Hawk too.



#48 pilot jets are part number 46-9705
I wouldn't recommend Hollister. I ordered my jets from them May 23rd and still haven't received them. I also e-mailed them a few days back with no response. Now we have nice weather and my bike has been sitting waiting for parts for almost a month.
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Old 06-14-2011, 01:45 PM
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Originally Posted by superdutyd View Post
I wouldn't recommend Hollister. I ordered my jets from them May 23rd and still haven't received them. I also e-mailed them a few days back with no response. Now we have nice weather and my bike has been sitting waiting for parts for almost a month.
If you have any problems with Hollister Honda, just shoot me a PM or post up and let me know and I will get it taken care of for you.

Send me your order info and contact info and I'll get you taken care of.
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Old 06-14-2011, 01:46 PM
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Originally Posted by Cafe Racer View Post
Got a '98 VTR with stock carbs.

Installed a set of Yoshimura cans. Bike spits and coughs off of idle when cold started.

Ordered a set of 48 pilots. Looking for some #4 washers.

Will advise on the outcome shortly.

Miguel
Well you're one of the guys that is close enough to just bring it by if you have any issues after setting them up.....
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