bing to mikuni

[tomale]

Bob, is the 74 carb'd by a Bing, if so then that is the reason. frankly my 76 acted like that until I put the mikuni on it, I raced that bike in the +50 class, that was several years ago. Until recently, several of the guys I race against thought my 250 was actually a 400. It shocked them when I told them it was only a 250. It has the bottom end like a 400 and pulls out of a corner so fast.. and yet it loves to rev to the moon.  I was looking at the porting on that bike and it is pretty impressive, with all the fancy porting.. I wonder what it would like if I bolted a reed valve on it..

Thom Green,Still crazy after all these years!
76' 250 MC5 (orginal owner)
74'250 hare scrambler (project)
74' 1/2 440 maico
78' 440 maico
72' cr125 Husky (project)
93' RMx 250 suzuki

[brian kirby]

Now you guys have me wanting to try a 36mm Mikuni on the 400.

Brian

[454MRW]

I had a Mikuni on my 78/79 KTM MX-6 250 when I rode at the 2006 Reunion Ride in Park Hills, and it indeed has a great low end that never faltered. The only problem was the weather and my inexperience, which caused a lot of spills which flooded the engine, possibly due to too high of a float level. The bike ran great, but lacked a little on the top end compared to the earlier engines, but that seems to be the consensus for the 78 and later KTM engine porting.  I also ran a Circle F pipe. Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1980 KTM 175-400'S
1975 Can Am 175 TNT & 77 250 Black Widow
1979 Husqvarna OR390
1976-78 RM & 77-79 PE Suzuki's
1974 CR250M 07 CR125R 79 CR250R

[chicagojerry]

i have to say that despite all this mikuni discussion, i'll stack my bing carbed 250 against practically all comers.( and i think that brian kirby will affirm that) its extremely strong, reliable, good starting and pulls well thru the entire powerband. a good bing works well but thats the key. a GOOD bing.  i have tried some mik's before but the float level is critical. it seems that the bing is more forgiving than the mik in that regard. ( be careful of my email, it looks like i was hacked)    chi jer

[Mike Hufnagel]

I have a reed valve and a bored out 36mm on my 250 motored Jackpiner and it was a pain in the ass to fit. Had to mill the reed block on an angle, grind a little bit of the case & carb drain bolt away. Not to mention the biggest pain was to line up the carb & air box.

'12 Husaberg TE300
74 Yamaha TY 250
84 Yam IT200
75 Jackpiner w/ 250 eng.
82 KTM GS250II (import)
82 KTM 495 (2)
98 KTM 300mxc
04 KTM 125 SX
00 KTM Duke 2/rd. racer
06 KTM 950 Adv.
08 Suzuki DR70Z

[Gordon Brennan]

quote:Originally posted by chicagojerry

i have to say that despite all this mikuni discussion, i'll stack my bing carbed 250 against practically all comers.( and i think that brian kirby will affirm that) its extremely strong, reliable, good starting and pulls well thru the entire powerband. a good bing works well but thats the key. a GOOD bing.  i have tried some mik's before but the float level is critical. it seems that the bing is more forgiving than the mik in that regard. ( be careful of my email, it looks like i was hacked)    chi jer

+1 The only negative is puking fuel on the motor with the tickler.

[Lew Mayer]

Jerry, You rode my JackPiner with a Bing. How do you think that ran?

Lew Mayer

[tomale]

Just so that we are clear, I have Bing carbs on both of my Maico's so I am not bashing Bing's. A Bing when it is well set up and is in good shape does work very well, I just think that on some bikes, A Mikuni works better. If you are happy with your Bing, by all means run it.

Thom Green,Still crazy after all these years!
76' 250 MC5 (orginal owner)
74'250 hare scrambler (project)
74' 1/2 440 maico
78' 440 maico
72' cr125 Husky (project)
93' RMx 250 suzuki

[chicagojerry]

lew, your jackpiner ran very well. i wouldn't change a thing. but i do run a mikuni on MY 175.  chi jer

[Dale Sonnenschein]

I just got prices from bing for a slide and a pilot jet and bowl gasket. 156 bucks for a slide!!!!  I can buy a mikuni AND lunch and have change left over. It's mikuni time!!!!!!!!!!!!!!

74 puch 175 SD
73 Husky 360 WR/RT
75 Penton 250
10 ktm 250xc
02 bmw r1150r

[Lew Mayer]

It is ridiculous, the prices for Bings and their parts, considering how they wear so badly. I don't think I've ever worn out a slide or needle on a Mikuni.

Lew Mayer

[tomale]

I have been thinking about building a bing using a slide that has been ceramic coated, or maybe some other coating, that should eliminate the problem of worn slides.. It would be alot less to coat a slide than to buy a new one.

Thom Green,Still crazy after all these years!
76' 250 MC5 (orginal owner)
74'250 hare scrambler (project)
74' 1/2 440 maico
78' 440 maico
72' cr125 Husky (project)
93' RMx 250 suzuki

[wfopete]

If the slides wear that badly, I wonder how well the carb body that it rides in holds up?

Maybe you could send them both to a cylinder/piston plating service?

Just kidding...I think!  

Pete Petrick
175 Jackpiner
Slow but Good

[brian kirby]

About a year ago one of the guys on the Maico Yahoo group sent a Bing slide to Swaintech to have it plated/coated, I forget what coating was used. It didnt work, I forget the exact reason, I think it was too hard to get the right OD on the slide for it to work correctly in the body.

Brian

[tomale]

Hmm, I figured that I would need to turn the slide down so that we would get the coating right. The point is well taken.

Thom Green,Still crazy after all these years!
76' 250 MC5 (orginal owner)
74'250 hare scrambler (project)
74' 1/2 440 maico
78' 440 maico
72' cr125 Husky (project)
93' RMx 250 suzuki