Author Topic: Fuel injection conversion on big bore cb 750 ?  (Read 1572 times)

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deuce_454

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Fuel injection conversion on big bore cb 750 ?
« on: September 12, 2009, 07:35:40 AM »
Ok here goes... i have fiddled some with fuel injection in the past so im not scared off by the concept... Im now in the process of building a cb 750 cafe racer and have decided to upgrade the engine now that it was out anyway

Its a 78 f2 engine with stainless valves and a moderate portjob... the jugs are 73mm bore with 12:1 compression (lowered by head work..) and the cam is a 300 deg web cam, the exhaust is a 4 into 1 and the ignition i have is the "new" optical unit from cycle x...

now im looking at installing a throttlebody/injector from a cb 600 or 900 that can be had cheaply on ebay.. allong with an intank pimp from the same bike (they simply bolt into the tank and is sized for the application) .. also used btw..

I am thinkung about buying the microsquirt and running it speed density / alfa-n blend so it will runn off the map in low load/high vacuum.. and strictly off tps and rpm in high load (the microsquits has this feature btw)

does anyone have any input on this plan... any is apreashiated....


the price looks to be comparable to a set of cr carbs by the way....

Offline lone*X

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Re: Fuel injection conversion on big bore cb 750 ?
« Reply #1 on: September 12, 2009, 09:54:20 AM »
Save yourself some research and development time.  Check out 750essess' project:

http://forums.sohc4.net/index.php?topic=30624.0
Lone*X  ( Don )

75 CB550K1  
VTX1800C for two up cruisin.
Several others have come and gone but whose keeping track.
52 years on two wheels and counting.....
"The best safety feature of any motorcycle is the one God put between your ears.  It's also the least utilized"

deuce_454

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Re: Fuel injection conversion on big bore cb 750 ?
« Reply #2 on: September 13, 2009, 07:13:36 AM »
actually his thread is what fueled my desire to do the efi..... but the thread has not been touched in 120 days.....

Offline voxonda

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Re: Fuel injection conversion on big bore cb 750 ?
« Reply #3 on: September 13, 2009, 08:14:05 AM »
actually his thread is what fueled my desire to do the efi..... but the thread has not been touched in 120 days.....


Why don't you PM 750essess? Know he can give a lot of info.

Rob
Better sorry for failing then for the lack of trying.

deuce_454

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Re: Fuel injection conversion on big bore cb 750 ?
« Reply #4 on: September 13, 2009, 10:23:57 AM »
done :-)