modifications needed to install 525 efis in 35 cafe racer
 

wondering what if any are needed 1989 35 cafe racer 420s with trs drives want to install 525efis want to keep trs drives

Bell housings, couplers, swap ring gear to the back of the flywheel, and you'll need to either redrill the heads for the exhaust off the 420's or get custom tails.

Also the engine hatch I'm pretty sure won't fit And need to be modified for extra clearance. Because with the 525's I'm sure you'll want to run the mercury headers that come on the 525 EFI's which would hit the hatch. But the 420 exhaust could work, but that would hinder the performance correct?

the 420 exhaust would live longer than 525 headers...

Sure, but if your dropping the coin on the EFI's I'm sure everyone would want the fancy smanchyyy shiny big tubes from the merc exhaust. At least one would think

I'm not sure there would be a clearance issue. I had big tube CMIs on my 750s and they were even height with the flame arrestor. Single plane intake with a dominator carb.

I had an 89 35 with 500s and the tall Merc Gill tail pipes with no clearance problems.

Same tooth count. And Phil do a search about 525 headers. Another post proving your ignorance.
There is plenty of hatch clearance also.

You can't put the Gil on a 525 the bolt pattern is incorrect. There is no clearance issue with the 525 . Jamie pretty much stated what's needed. If it a std 160 tooth ring gear the starter won't be a problem. I don't know of it's a differant tooth count. Doubt it but just a thought u had,

I believe that the cannon plug is different on the old 420 harness compared to the 525efi.

what heads are on the 525's?

As far as performance, I dont know there are some engines making big numbers with GIL/Stainless Marine and such.... I would not worry about performance

The trs trans has ears on it that bolt to the inner transom plate, and a trs cafe should have a front and rear motor plate. Even if the 525 had the 14 pin connector merc makes a 14 pin to 10 pin adapter.

how is the rear of the 525efi supported with a trs setup if the inner plate cannot be used due to the tranmission?

525's, 600SCi and 700SCi's have the edelbrock aluminum heads with a "non standard" exhaust bolt pattern.

I thought they were Edelbrock, didnt know about the different bolt pattern....

You can use a rear mount plate and transmission set up . That's how mine was set up. Yes the heads are non conventional bolt pattern. You can re drill header flanges but a manifold is cast and no way possable to accommodate the bolt spread differance. As for manifolds on big motors there are plenty. I had a set of stainless marine on a 1000 hp blower motor. They make a bit more toque on SC engines.