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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Do straight pipes cause valve problems? /cgi-bin/YaBB.pl?num=1331595356 Message started by built2last66 on 03/12/12 at 16:35:56 |
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Title: Do straight pipes cause valve problems? Post by built2last66 on 03/12/12 at 16:35:56 Do straight pipes on single cylinders cause floating valve or other serious engine problems over time? Is a drag pipe with a baffle considered a "straight pipe"? |
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Title: Re: Do straight pipes cause valve problems? Post by Serowbot on 03/12/12 at 18:39:14 Technically speaking,. I believe the answer is no... ...but,... the length and diameter of the pipe needs to be perfectly tuned... In the real world,.. an open pipe will almost certainly cause exhaust pulses to revert back into the valve and overheat them, and that, in combination with lean conditions caused by an almost untunable power band will burn yer' valves... Basically,.. it ain't a good idea.. and it'll run like crap... :-?... |
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Title: Re: Do straight pipes cause valve problems? Post by arteacher on 03/12/12 at 19:28:14 Don't get your nighty in a knot there Built- the Raask is not a straight pipe. It has a restriction where the pipe joins the header which is about the same diameter as the inside of the baffle, (that's how you can clamp the two pieces together without a clamp showing), and the baffle runs pretty much the entire length of the muffler. A straight pipe is the same diameter over it's entire length. Also, our bikes don't run like crap. ;) |
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Title: Re: Do straight pipes cause valve problems? Post by built2last66 on 03/12/12 at 19:55:00 I'm already in a knot, I'm having tuning problems with my pod air filter, and still that jingly sound... I guess it's the valves but I had them adjusted by a mechanic... Anyone know how many turns the stock air mixture screw on the side of the carb is? |
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Title: Re: Do straight pipes cause valve problems? Post by justin_o_guy2 on 03/12/12 at 20:12:35 I guess it's the valves but I had them adjusted by a mechanic... Im sure thats a comfort after reading how the mechanics do these little bikes.. |
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Title: Re: Do straight pipes cause valve problems? Post by Oldfeller on 03/12/12 at 20:20:56 Especially if the "mechanic" doesn't shave or vote yet and he still thinks his un-annotated copy of Clymers is the whole gospel truth ..... |
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Title: Re: Do straight pipes cause valve problems? Post by arteacher on 03/12/12 at 20:30:36 "Anyone know how many turns the stock air mixture screw on the side of the carb is?" Stock it's 1 3/4 turns out, but you are way beyond "stock". If your having trouble tuning it I would get rid of the cone filter and put a K&N slab filter in the stock air box. That, and the Dial-a-Jet, is the difference between yours and mine and I didn't have any trouble tuning mine. I don't know if you have done a spacer mod or not- I have a 2/3 spacer in mine. |
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Title: Re: Do straight pipes cause valve problems? Post by built2last66 on 03/13/12 at 06:40:12 4D46464F434C4D5756220 wrote:
Ryca recommends 1 1/2 turns in their youtube carb tuning video as a starter, seems like my engine is at max rpms at 60mph with 1 1/2 turns.. I'm doing the spacer mod at around 2.5mm with brass and stainless washers... I have torque to blast up a hill in the twisties but not the speed on flat land anymore.. aha |
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Title: Re: Do straight pipes cause valve problems? Post by arteacher on 03/13/12 at 07:15:13 Mine will do 90 + with my 250lb a$$ on it. |
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Title: Re: Do straight pipes cause valve problems? Post by built2last66 on 03/13/12 at 07:32:43 575C5C555956574D4C380 wrote:
I just need to tune this.. I'm thinking 60 pilot, spacer mod, play with the idle screw and the air mixture screw.. possibly even experiment with a 157.5 to 160 main... it all got crazy out of wack when I threw that pod air filter on the carb boot... My pod is attached to the rubber carb boot, hopefully creating a wind tunnel... besides, with the stock air box I won't have room for the fake oil bag :D There is no going back to the air box... I refuse to walk across the room and pick it up off the tiny work bench... http://www.knfilters.com/search/product.aspx?Prod=rc-1920 I'm gonna try backing the air mixture screw out to 3 turns aha.. |
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Title: Re: Do straight pipes cause valve problems? Post by verslagen1 on 03/13/12 at 07:56:03 21362A2F37712F2230377575430 wrote:
The idle mixture screw has nothing to do with 60 mph unless you're going in 5th gear and going downhill. |
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Title: Re: Do straight pipes cause valve problems? Post by built2last66 on 03/13/12 at 08:01:16 687B6C6D727F797B702F1E0 wrote:
The idle mixture screw has nothing to do with 60 mph unless you're going in 5th gear and going downhill.[/quote] I was talking about the air mixture screw on the right side of the carb, the one you need the tiny screw driver for |
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Title: Re: Do straight pipes cause valve problems? Post by spacepirates on 03/13/12 at 09:03:08 The idle mixture screw (air mixture screw, D*%n soft brass screw on the right side, whatever) has very little to do with engine performance beyond idle (hence the moniker "idle mixture screw" in addition to "air mixture screw"). it really only affects idle. Once the throttle is engages you get into the needle jet/jet needle area, and finally once you are closing in on WOT, the main jet. There is a diagram of where each fuel circuit is in play somewhere in the tech section. Also in the tech section are two nice and handy jetting guides. To paraphrase and sum up the idle mixture screw tuning part: - with the bike off, turn the idle mixture screw all the way in, then count it two full turns out - start the bike and using the idle speed screw (left side), bump up your idle a bit (makes things a bit easier to hear, less likely to die). - back the idle mixture screw out slowly, count 1/4 turns at a time (waiting a tad between each adjustment), until revs start to drop - from that position, count 1/4 turns again until the revs drop again (so you'll turn the screw through the "happy idle" range). - divide the number of turns from "screw too far out and rough idle" to "screw too far in and rough idle" in half, and set the screw there. should be pretty close to ideal jetting if the pilot is the right size. |
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Title: Re: Do straight pipes cause valve problems? Post by built2last66 on 03/13/12 at 09:14:39 Thanks Spacepirates, I'll give this a try |
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Title: Re: Do straight pipes cause valve problems? Post by Serowbot on 03/13/12 at 10:34:25 So,.. I'm confused... Are you trying to tune a straight pipe, no pipe, or a Jardine?... :-?... |
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Title: Re: Do straight pipes cause valve problems? Post by arteacher on 03/13/12 at 11:05:29 A Raask with the baffle. |
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Title: Re: Do straight pipes cause valve problems? Post by built2last66 on 03/13/12 at 16:25:27 3D2B3C21392C213A4E0 wrote:
I'm trying to tune the bike, seems like I have to change to 5th gear to hit 50mph.. I added a K&N pod filter now I'm trying to adjust everything.. |
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Title: Re: Do straight pipes cause valve problems? Post by Routy on 03/14/12 at 08:25:38 Sounds to me like its being choked at the higher Rs, which is exactly what a air filter will do when its not large enough to pass the air that the thumper is sucking at higher Rs. And believe it or not, no amount of tuning can correct for that. |
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Title: Re: Do straight pipes cause valve problems? Post by arteacher on 03/14/12 at 09:36:11 +1 |
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Title: Re: Do straight pipes cause valve problems? Post by built2last66 on 03/14/12 at 18:57:08 616E746F737566646C6275070 wrote:
So go to a smaller air filter? |
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Title: Re: Do straight pipes cause valve problems? Post by Serowbot on 03/14/12 at 19:04:39 41564A4F57114F4250571515230 wrote:
Bigger... Any smaller and your carb will swallow it... :-?... |
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Title: Re: Do straight pipes cause valve problems? Post by built2last66 on 03/14/12 at 19:09:44 1006110C14010C17630 wrote:
Bigger... Any smaller and your carb will swallow it... :-?...[/quote] This air filter is huge... the carb boot fits it just like the air box did.. it can only go smaller... http://www.knfilters.com/images/m/RC-1920.jpg Part RC-1920 Product Specifications Product Style: Round Tapered Universal Air Filter Base Outside Diameter: 3.5 in (89 mm) Flange Inside Diameter: 2.125 in (54 mm) Flange Length: 0.625 in (16 mm) Flange Type: Centered Height: 4 in (102 mm) Top Outside Diameter: 2 in (51 mm) Top Style: Metal Top Material/Finish: Chrome Filter Material: Cotton Gauze Flanges: 1 Filter Re-Oiling Amount: 0.34 oz (10 ml) http://www.knfilters.com/search/product.aspx?Prod=rc-1920 |
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Title: Re: Do straight pipes cause valve problems? Post by Bobbert on 03/28/12 at 00:37:26 take it off. I've run mine w/o for 500 miles keep rocks and hard stuff out, clean the carb and plug every so often |
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Title: Re: Do straight pipes cause valve problems? Post by k9500winmag on 03/28/12 at 13:55:16 Ive been running a short straight pipe for a bit now and have had no problems. No sign of burned valves or valve float. No ticking or knocking so far. Time will tell though. |
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