More HP for a K75 (& K100)

nh7robmw said:

Hey Todd;

Have you ever tried Sea Foam in your gas tank and/or crancase? It really cleans all the carbon gunk out pronto. A lot cheaper fix than new injectors.

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Yup, i've used it. And it helped with the K75. I just never knew for sure what the bike went through with the PO. It was a 94' and when I got it in 08 it only had 9700 miles on it. That's 700 miles a year!!! Definitely was a neglected bike. I read this thread and pulled the trigger.

My swap today was nearly effortless. I swapped the injectors and spark plugs in under and hour.

The bike feels like it has LESS power but my guess is that the power delivery has become much much smoother. One issue I am having is that when I am in 2-5th gear and under 2500 RPM there is a heavy hesitation when I get on the throttle. This was not happening before I swapped the injectors. And all the plugs are gapped the same.

Info from Seafoam

oops

K75 Power

After having a K75S for 16 years and trying as much as possible to get it to go faster/more power I gave up. I loved that bike , which I recently sold.
You want TO KNOW the best thing to do with your 75, ??? buy a FOR SALE sign, sell it, BUY a K1200RS and you will have ALL the power you will EVER NEED !!!!
BETTER EVERYTHING, granted a little more weight, but.... oh that power !!!!
They are practically giving K1200RS' away with this economy, thanks Goerge W.

Two thumbs up for Sea Foam

Paul_F said:

So how long or what distance do I leave this in before changing the oil and loosen gunk?

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A 15-mile ride revving up to 6k or so for 30 minutes worked for me; I could see the foam on the top of my oil level through the sight glass once it was back on the center stand.

I let the engine cool down for 20 minutes and proceeded to drain the still hot oil and remove the oil filter. The oil had been in for only 800 miles yet is was dark and dirty from all the residue that the SeaFoam had loosened.

If I could somehow change the motto on our currency, I would do so:

In Sea Foam We Trust

PS: After a 60 mile commute with fresh oil and filter the oil is now clearer and lighter than maple syryp. I'll keep an eye on it and change it again as soon as it darkens or gets dirty, which might be a long ways off.

I occasionally put Sea Foam in my gas tank to keep the injectors clean and ward off the evil Hawaiian humidity, too.

Fyk

doubledd said:

After having a K75S for 16 years and trying as much as possible to get it to go faster/more power I gave up. I loved that bike , which I recently sold.
You want TO KNOW the best thing to do with your 75, ??? buy a FOR SALE sign, sell it, BUY a K1200RS and you will have ALL the power you will EVER NEED !!!!
QUOTE]

Or, heck, get a K100RS for about the same money you'd get for your 75S. A bit buzzy but I'll never forget that torque (mine was FYK with the hotter cam). Still the most bang for the buck IMO and what a fun ride!

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I don't usually use SeaFoam, although I have in the past. Rislone in the crankcase and Marvel Mystery oil in the gas on occasion. What seemed to really loosen it up was cruising for 2 hours on the freeway at a safe and sane 75-80 mph (as clocked by the slightly optimistic speedo) with bursts up to 90 mph to get around the semis' buffeting in the Western New Mexico wind.

Dang it was running good. Can't get that in a bottle.

bprigge said:

Does anybody know what the Ford injector flow rating is and how it compares to the stock BMW injectors? I'm a small block Ford enthusiast and know that there is often more power available by increasing the injector size (flow rating) and also sometimes by decreasing the injector size, all of it depending upon other engine mods. Bruce

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try here: http://users.erols.com/srweiss/tableifc.htm

breyfogle said:

I recently had my stock injectors off for professional cleaning. They were returned with new O-rings top and bottom. The fit was VERY tight, more so the top than the bottom. I was a bit worried that the new O-rings would not seat properly because hand pressure was not enough to fully seat the fuel rail. Tightening up the fuel rail hold down bolts snugged everything up OK however.

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probably the wrong o-rings order them online from as cycles or maxbmw, there cheap and the correct size.

Dennie said:

probably the wrong o-rings order them online from as cycles or maxbmw, there cheap and the correct size.

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My o-rings were also VERY snug when I got my injectors back from the shop. Had to use the fuel rail hold down bolts to seat them correctly.

My new injectors were very snug as well. So much so that when I kept trying to insert #3, the #1 injector would pop out. I took a hammer and tapped the rail in while keeping a folded rag in between the hammer and the rail. Just tightening the bolts did NOT cause the injectors to be seated.

A bit of engine oil smeared on the O-rings will allow them to seat much easier.

My Ford injector experience from the past...
http://forums.bmwmoa.org/showthread.php?t=5801

deilenberger said:

A bit of engine oil smeared on the O-rings will allow them to seat much easier.

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Yeah, I read that tip after my install was done. Is the oil there only to aid in installation or are there other benefits to it? If so I will consider repeating the process in order to oil up the rings.