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K & N
Nov 25, 2006 16:33:11 GMT -5
Post by holmesboy on Nov 25, 2006 16:33:11 GMT -5
I have just purchased a 1978 SR and I am looking to put on a K&N filter. The bike is running the original carbie.
If I get rid of the airbox what model filter is it that bolts straight onto the original carbie? Are there any modifications that are required? ie Jetting etc
How do they work on the standard carbie or is it best to replace with an aftermarket carbie?
Last but not least, where is the best place to get one?
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K & N
Nov 25, 2006 22:00:25 GMT -5
Post by StewRoss on Nov 25, 2006 22:00:25 GMT -5
Hi, Just fitted one this morning to another SR...went on fine. Can't recall the model filter, but it is angled and not straight. Deus or Vanem will have them, so of course would K@N if you buy them from a bike shop...Bike ran well with no jetting changes. I did adjust the mixture screw a little but that's all. You have to remove the airbox and the toolbox...made easier if you also undo the front part of the rear guard, plastic bit, at the same time to make more room...then put it back again when the airbox is out. You'll need to source a small K@N breather filter and some plastic/ rubber tubing to fit it into. That will replace the plastic funnel that forms part of the airbox and acts as a breather leading into the filter box area. I prefer to run a breather filter on a hose about 10 - 12" long...not directly on top of the breather. I've seen oil come out here when you're going quickly. Basically a straightforward job. Enjoy your bike. SR  |
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K & N
Nov 26, 2006 12:21:57 GMT -5
Post by hopwheels on Nov 26, 2006 12:21:57 GMT -5
Here's a link to K&N's site which allows you to put in all the specific dimensions for your carb and get the filter you need ( www.knfilters.com/search/univ2.aspx?ID=S0012 ). It appears there are 4, "round straight universal" filters (RU-1060, RU-1070, RU-1402, RU-1780) that should fit the stock '78 and '79 SR carb (Mikuni VM34SS) intake OD of 53mm These are all angled flange style (3 are 10°, 1 is 20°), which fit the mount angle on the SR. I only searched in "round straight universal". There are others that may fit as well, either oval, or tapered or what have you. Just bear in mind the critical dimensions (fits the carb intake OD, angled 10° to 20° flange, and probably no longer than 6" and no rounder than 4"or 5" to fit the area where the airbox was removed). Good luck! |
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K & N
Jun 9, 2008 3:46:47 GMT -5
Post by solosolo on Jun 9, 2008 3:46:47 GMT -5
Anyone got an idea of the right one for an SR 400 2006? Also is it same as Sr500 bung it on and off you go or are there more complicated modifications?
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K & N
Jun 9, 2008 4:30:26 GMT -5
Post by StewRoss on Jun 9, 2008 4:30:26 GMT -5
Not sure about the CV carbs...give it a try...measure the inlet side of the carby to get the right diameter for the filter connection. The carby would have jetting changes able to be done, if you're able to adjust the mixture on those carbs (mixture screw) that may be all that it requires...should be relatively straightforward. Just had a look at your bike pics...has it got a cold air injection tube going to the head? If so you will need to blank the head entry off, and also you will need to fit a breather filter as well. Let us know how you get on. SR  |
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K & N
Jun 9, 2008 5:59:25 GMT -5
Post by jdbrees on Jun 9, 2008 5:59:25 GMT -5
In case you didn't know, K&N makes a filter that fits in the stock airbox should you want to keep it.
Jerry
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K & N
Jun 13, 2008 6:11:50 GMT -5
Post by solosolo on Jun 13, 2008 6:11:50 GMT -5
I think I really want to remove the existing air box cause I like the look of the emptyish triangle and no side covers...
That said I am definitely mechanically retarded!
1. What is a CV Carb?
2.The carby was rejetted by Deus when they changed the exhaust and header for me... Might this throw that out of whack?
3.WHat is a cold air injection tube and how do I check if it has got one and when you say blank it off dis that another way of saying block it off?
4.Where does the breather filter go and what is a breather filter?
5. Told you I was mechanically retarded!!!
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K & N
Jun 15, 2008 5:47:53 GMT -5
Post by StewRoss on Jun 15, 2008 5:47:53 GMT -5
CV stands for Constant Vacuum...they are a carby that uses the air flowing through the venturi to create a low pressure area above the slide...via a lift hole...and it opens the throttle that way via opening a butterfly plate...there is no direct connection between the slide and the cable. This is a fairly simplistic explanation... Most modern road bikes (almost all) that don't have FI have them now. Not sure about the jetting on these carbs...I am going to get one and have a play...not that I don't have enough else to do! The cold air injection tube is the long chrome tube that goes beside the left side of the barrel and goes into the underside of the exhaust area of the head...you can remove it and blank off the entry to the head by a plate. Same at the other end I reckon. I might also have a look at one of these one day more closely to see exactly what's involved. We have a guy with one here in the ACT...might talk him into removing it so I can do one. There is a breather that is on the top of the cases near the rear...about 1" outlet...it feeds into the lower part of the airbox for recirculation of the oil from the main engine breather. There is also another small one for the flywheel in front of it and one on top of the head. The large one will be open once you remove the airbox. You need to put about 12" of heater hose onto the outlet, and then fit a small K&N or similar breather filter to prevent the ingress of dirt into the engine. Not hard but necessary. Look in a K&N catalogue for the one with a steel tube hanging out of it so it can be pushed into the heater hose...use steel hose clamps to secure it top and bottom. I'll try to find a link to somewhere where you can see what I mean. Personally I stay away from filters that attach directly to the breather spigot directly...although they are available. Here are the steel tube types I am referring to... www.bbtmotorsports.com/images/intakes/filter5.gifSR |
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K & N
Jun 15, 2008 7:13:23 GMT -5
Post by wotavidone on Jun 15, 2008 7:13:23 GMT -5
Stew is spoton with the bit about the breather filter on the crankcase. I put a filter straight to the spigot on the crankcase on my XT, and always misted a bit of oil. So I put it on a long hose, which helped a fair bit.
The spigot is19mm on the XT engine, and I could only get a filter with a 15mm ID rubber spigot. A copper reducing nipple (used in plumbing for joining 2 different sized copper pipes) cost me a couple of bucks and allowed me to mate the filter to the bigger hose from the crankcase.
Mick
Later on,I put the original oil separator back in, then put the filter on the end of that. That is working well, though I'm not happy with the way I mounted it all.
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K & N
Jul 4, 2008 8:24:46 GMT -5
Post by pvlietstra on Jul 4, 2008 8:24:46 GMT -5
I have fitted K&N's to 2 SR500's without any jetting changes. For the crank case breather, I use a length of plastic tube ending under the seat near the tail light. No filter used here, ducati style.
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K & N
Jul 6, 2008 5:22:45 GMT -5
Post by solosolo on Jul 6, 2008 5:22:45 GMT -5
The fellow at Vanem said the SR 400 would likely need re-jetting. He said otherwise might have flat spots?
Almost saved enough $'s for the kit!
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