Topic: CB750/836 Midget Motor,Yosh rods etc.

[Bill/BentON Racing]

Gentlemen - posted on behalf of Bellcow54: (Drew here)

(Bill will edit with additional information)

[Bill/BentON Racing]

Pics are 836cc midget racer engine,saw when it came apart,why it didn't run long.The bolts holding cam towers were loose,cam had lost pressure on one side,Art pistons hitting or way too close to head.Top of pistons have marks from valve to piston contact,had a regrind cam,Yosh rods,lighter cam sprocket,external oil pump driven off rt side of cam.Thats about it. Bill,

[754]

I call dibs if the  dynoside cover, and cam cover are going to be sold down the road..

 Cool engine, be neat to use in a few things..

[Bill/BentON Racing]

Frank,you can't get all the good stuff,the Webers weren't enough? ,Ok you get first dibs.Check out pic #6,I took front nut off of cam bearing cap,rear was the way it came off,long way from cylinder head,the other bolts 2 were loose only one was torqued!Bill

[Big Jay]

Never say a TQ engine with stock valve springs and retainers, cylinder studs, etc. Looks like a stocker with Yosh 811 and rods. Was this raced in the US?

Jay

[Bill/BentON Racing]

Supposedly,I think it was built by a newcomer to the sport.I also couldn't understand why no H/D studs etc.Pistons only said ART,no .050,no POPY,no 812 just ART.No color under domes,not much carbon,didn't run long, improper assembly for sure.  , ,Bill

[JLeather]

Man, I'd be interested in the whole engine if it comes up for sale.  Put it to a BMW tranny or something

[Don R]

BMW trans hmmm. My dream project would be a bike with an offenhauser or miller 4 de-tuned enough to ride. Reality would dictate an olds quad 4 or honda car engine.

[754]

I want to put one in either a small boat, or a midget racer..

My buddy whose bike I will be hopping up, used to have a crackerbox..
 Boat.. about 12 ft long with a V8 in it.. I figure with a 750 in it, could be 9 or 10ft long.. must have Webers on it!... Then folks on the lake can enjoy that SOHC song on hot days.....

[HB-1fan]

I had an old friend named Bud Marnett(lots of stories and pics) He built one of these for his son(one of my weldors at our fab shop) to race here in Fl. These things were crazy fast. He was from Indy and his house was a midget race shrine. I used to go and pit for them. These things had 10K plus in the engines and would run wide open at 100 mile an hour at 14k rpm until the next caution flag. Yes, about 10 feet long, no tranny, about 2 feet of drive shaft (that you stratled) and a billet $5k quick change differential.  Jets so big you could put saftey wire through them and not to mention mechanical Hillborn F.I. all over the place.  And did I mention kids driving them. Boys and girls!!! One of the girls was always in the top 5 and went on to race open wheel cars(Indy lights, I believe!

HB

[wannaby]

  Hi guys ressurecting an old post and asking for some help from this knowlegable board ....Anybody know how they did the oilpump in this motor or others as isnt the pump usually in the trans ....And if anybody could direct me to some sites with more info on these cutdown midget 750 motors it would be appreciated...Den

[bradweingartner]

Hi guys ressurecting an old post and asking for some help from this knowlegable board ....Anybody know how they did the oilpump in this motor or others as isnt the pump usually in the trans ....And if anybody could direct me to some sites with more info on these cutdown midget 750 motors it would be appreciated...Den

Look at the pics. Cam driven oil pump 

[wannaby]

Hi guys ressurecting an old post and asking for some help from this knowlegable board ....Anybody know how they did the oilpump in this motor or others as isnt the pump usually in the trans ....And if anybody could direct me to some sites with more info on these cutdown midget 750 motors it would be appreciated...Den

Look at the pics. Cam driven oil pump 

mmmmm...didnt even notoce is it home made or available somewhere....do you know of anymore info on these converted motors....

[kos]

Hi guys ressurecting an old post and asking for some help from this knowlegable board ....Anybody know how they did the oilpump in this motor or others as isnt the pump usually in the trans ....And if anybody could direct me to some sites with more info on these cutdown midget 750 motors it would be appreciated...Den

Look at the pics. Cam driven oil pump 

This oil pump re-location was done by a guy who did one for me. He was from Indiana, the "hot-bed" of the dirt track midget car racing.  He passed away 10 years go or more.

Works well.


KOS

[wannaby]

  So all the old timers that used to do this stuff have passed away....... where can I find any more info on these motor conversions.

[Jerry Rxman Griffin aka MuthaF'er]

Plenty of old timers left in Indiana. Search 3/4 midgets and get on their site. Send out some emails. I picked up a big valve head and "bent" rods from one of them a few years back. MRieck had both in hand. He can vouch as to what I received. There's plenty of this old stuff hanging around their garages since they've switched "allegiances" to "other" engines. Buyer beware. 

[wannaby]

Plenty of old timers left in Indiana. Search 3/4 midgets and get on their site. Send out some emails. I picked up a big valve head and "bent" rods from one of them a few years back. MRieck had both in hand. He can vouch as to what I received. There's plenty of this old stuff hanging around their garages since they've switched "allegiances" to "other" engines. Buyer beware. 

 >:(Wow ...hard to believe....I have spent hours an hours  looking all over the net and cant find any picks of SOHC4 motors converted for 3/4 midget racers or much info how it was done lots of picks of cars but none of accual engines....frustrating .....any picks or leads appreciated...Den

[MCRider]

Plenty of old timers left in Indiana. Search 3/4 midgets and get on their site. Send out some emails. I picked up a big valve head and "bent" rods from one of them a few years back. MRieck had both in hand. He can vouch as to what I received. There's plenty of this old stuff hanging around their garages since they've switched "allegiances" to "other" engines. Buyer beware. 

YEah they cannibalized quite a bit of machinery when it was the prefered motors. Where are all the frames, transmissions, etc that were ditched? Landfill? 

Hopefully there are a bunch of piles waiting to be repatriated to SOHC4.net.

[754]

 I found a bit online when I looked months back.. its your search..
 use things like Honda sohc midget..CB750 midget..Honda 750 midget.. 1/4 midget racer.. things like that..
 I know you are trying to build an inline 4 bike. pump location is a minor problem.

 Drive of cam may mean reservoir above engine, is ok if you run in the tank. Otherwise run off front or rear of engine.. The way Cook built a drive off front for alternator? is very reminiscent of an Indian 4 part.
 You could easily run a Gilmer belt off the back of crank sideways to pump and charging, cept may have to slide away trans to change belt.

[wannaby]

I found a bit online when I looked months back.. its your search..
 use things like Honda sohc midget..CB750 midget..Honda 750 midget.. 1/4 midget racer.. things like that..
 I know you are trying to build an inline 4 bike. pump location is a minor problem.

 Drive of cam may mean reservoir above engine, is ok if you run in the tank. Otherwise run off front or rear of engine.. The way Cook built a drive off front for alternator? is very reminiscent of an Indian 4 part.
 You could easily run a Gilmer belt off the back of crank sideways to pump and charging, cept may have to slide away trans to change belt.

  Thanks and yes I have tried all of the above and more.....believe me there is nothing much out there as far as picks of engins go guess all the old timers didnt have digital cameras or computers...to busy racing.....

[754]

 I use a secret weapon..

 it involves ALTA VISTA... and a thing called WINDOWS 98..


 ...............                            

[wannaby]

 

[wannaby]

8)WOW....I must say after cruising around on this site checking out some of the projects going on ...makes my project idea look pretty simple looks like some of he guys here could build what I whant in a weekend just for something to do...Amazing.

[Bill/BentON Racing]

Brother,you are so correct.More SOHC knowledge here than any other site out there.Lots of helpful people.Frank you interested in engine or parts still? Let me know.Bill

[Sam Green Racing]

U wannaby banned from this forum   wrong make, a cam to many, not a race bike and it looks tatty to boot.

Sam.