OzVMX Forum
Clubroom => General Discussion => Topic started by: Doc on January 21, 2008, 06:44:58 pm
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Does anyone recognize the carb below or can anyone give some advice?? It's 32mm but...???
I won it today on eBay for about $7.00 hoping it would be okay for the RM125S motor. Looks like a powerjet but I don't know enough about them :-\ was going to blank it off if it is..snowmobile maybe?? It's from the US..can I use it if I block or remove the powerjet bits??
(http://img115.imageshack.us/img115/1751/32mmmikunidd0.th.jpg) (http://img115.imageshack.us/my.php?image=32mmmikunidd0.jpg)
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Doc is there a part number by the choke?
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Deej, I haven't actually got the carb in my mitts but the guy says the model number is 500 61 B 4V :-\
I also picked up a super nice priced CR125M Keihin..was hoping to fit this sucker to the TS/TM125. 28mm?? I've never had much to do with these carbs..do they work ??? CR's seem to like em' ;)
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Keihin carbs have me stumped, I dont think I have one anywhere. I dont recognize the part number but I'm sure someone here will.
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this is the Keihin
(http://img207.imageshack.us/img207/7869/f0cd1bc8.th.jpg) (http://img207.imageshack.us/my.php?image=f0cd1bc8.jpg)
paid $15.00 for this one but I fuggered the jetting would be somewhere 'near' the ballpark :P
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The only possible help I can give Doc is-
500, the first bit of the part No is DT400B
maybe, maybe not
Brent
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Thanks Brent, until I get the carb and look closer I'll be none the wiser I'd say. From what I've read Mikuni introduced the powerjets onto snowmobiles in the 70's. The carbs does look 70's to me with that high top. Least it was cheap ;)
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Don't you dare block that power jet off >:(
Looks perfect for a 125,the power jet allows a leaner needle to be run so you can have blistering top end without going blubbery on the needle.A small tweek can have that powerjet adjustable and working beautifully.The powerjet just sucks fuel dirctly from the float bowl into the airstream when the velocity is high enough.
Nothing to fear and plenty to gain.Just check the needle/seat size sleds usually have BIG sizes in there
;D
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errr..I didn't think you were allowed to run powerjets Loz..if so for sure I'll retain it but I need to consult the 'Book' first..I'll do that right now ;)
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Flatslide no, powerjet well...... (whistling while looking up)
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Could I get clarification from someone in the know as to whether I can actually run a powerjet carb since it is infact era? The bike will be pre'78. I can't find a reference to them in 'THE BOOK' and it could be just what the S motor is begging for :)
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Pre 75 says "No Flatslides" that's about the only reference to carbs in the GCR's individual meeting supp regs might be different.A great many are probably bliisfully unaware of the neddies lurking inside that PJ.
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Loz..I was tuned into these carbs a little with a project a friend and I built quite a few years back. T'was on an RZ500 minisprint. Fitted the powerjets (amongst other things) and he got himself a state title ;D just like playing with a YZ125 only times 4 with everything :) the pipes we made actually worked..I'll find a pic ;)
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RZ 500 already has PJ carbs but incy wincy 28mm jobbies.Lucky you were blissfully unaware of the problems with the RZ 500(and the RG500) main one being the rear bank being up to 8degrees out.
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so power jets are one of the ad on accessories you are in favour of Lozza ;D
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Loz the carbs we fitted the powerjets to were 36mm. not stock ;)
the pipes we made were copies of the factory OW70, the owner had a Yamaha book choke full of engine specs for the '83 GP model and the engine was built along identical specs from the base gaskets up. Problem was in this application the motors pretty much run either flat out or nothing but it proved pretty reliable. Blissfully unaware of problems yes :) had a few little teething problems with the rear cylinders leaning out /seizing but this was overcome after about 4 meetings ending in DNF's :( Seems the only pics I have showing the beast without the bodywork is a video..VHS though.. :-\
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It's even possible to make your own,sound like the TSR specs getting round now.I'll bet the rear left was the one always seizing????The drama is a combination of rear bank out of phase and the water goes from the front to the rear bank getting very hot in the process.Pity all the 500 engine ended up in those karts as with the RGV/RG 500 and the micoproducts frames for the RZ makes everyones 500cc dreams come true ;D
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yup! it was the left rear that had heat issues Loz. Can't remember what he did to remedy it but whatever it was it worked from then on. I remember fanging on 1 of the first RZ500's in QLD and that impression still remains..awesome! ;D