990 motor in SE frame

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Victorh
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Joined: Thu May 26, 2016 9:26 am

990 motor in SE frame

Post by Victorh » Thu Jun 16, 2016 4:05 am

Anyone tried to fit a 990sm motor into a SE?
Would still run carbs......but could have a fresh low km bike cheap as chips....

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Beer
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Re: 990 motor in SE frame

Post by Beer » Fri Jun 17, 2016 8:24 pm

I don't know anyone that's done it, but i guess it would fit with a little creativity here and there?

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Wilso
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Re: 990 motor in SE frame

Post by Wilso » Sat Jun 18, 2016 10:10 pm

Why would you want to do that then? Wouldn't it be best to rebuild and blue print the existing engine if it's a bit tired?

Victorh
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Re: RE: Re: 990 motor in SE frame

Post by Victorh » Sun Jun 19, 2016 12:47 am

Wilso wrote:Why would you want to do that then? Wouldn't it be best to rebuild and blue print the existing engine if it's a bit tired?
That is the plan but was wondering if a low low km 990 motor would be easier and quicker to fit.

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Wilso
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Re: RE: Re: 990 motor in SE frame

Post by Wilso » Sun Jun 19, 2016 9:36 pm

Victorh wrote: That is the plan but was wondering if a low low km 990 motor would be easier and quicker to fit.
It's been talked about putting 990engines in adv's my concern with the SE is the electrics batter and other things that might be more than just an engine swap, that an oil tank location etc. I'm sure it's possible just not sure it's worth it, better ,sort existing engine and perhaps bore to 1000cc :D

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Beer
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Location: Kent

Re: RE: Re: 990 motor in SE frame

Post by Beer » Mon Jun 20, 2016 4:55 am

Wilso wrote:
Victorh wrote: That is the plan but was wondering if a low low km 990 motor would be easier and quicker to fit.
It's been talked about putting 990engines in adv's my concern with the SE is the electrics batter and other things that might be more than just an engine swap, that an oil tank location etc. I'm sure it's possible just not sure it's worth it, better ,sort existing engine and perhaps bore to 1000cc :D
bore to 1000cc :shock: that would make my 40' roosts 50' long

oh and by the way just fitted twin turbos to mine. :D .....

fitting all the 16 valves was a fucker....but goes like shit off a shovel now though....mwhahahaha

Alon
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Re: 990 motor in SE frame

Post by Alon » Wed Jul 20, 2016 8:15 pm

For what it's worth, yes this can be done - my friend and I retrofitted a 990smt engine into his 950adv. A few things to keep in mind depending on your vision for the final configuration:

1- if you're going to use your SE carbs then be sure to remember to jet them accordingly - the 990 engines have slightly more displacement and higher compression ratio. They also generate more manifold vacuum than the 950, all things to consider if retaining the carbs
2- you'll need to use your 950's ignition wheel and set the dwell gap to the 950 spec, it will not work properly otherwise
3- 990 camshafts are different than 950; the overall valve lift, duration and timing is different and that will have an affect on how well the engine runs. We ended up using the 950 camshafts on my friend's bike - much better overall results compared to the 990 cams
4- depending on the source bike of your 990 donor engine, there are differences between 990 LC8 engines; in particular, the 990smr and 990smt have as much as five degrees more ignition advance compared to the Adventure version of the same engine
5- exhaust headers will bolt right on
6- the oil tank is easy to deal with and swap over
7- the internal gearing (gears 1-6) may be different than your 950se and you may or may not enjoy the end result. My 990smr is a fantastic machine but I'd never want it's close ratio gearing for the 950SE

Hope this helps as a start...
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TwoSEs
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Joined: Sun Sep 01, 2013 8:56 pm

990 motor in SE frame

Post by TwoSEs » Sat Aug 20, 2016 5:25 pm

Yup, been done by two folks I'm aware of here in the states. This one below is a 990Fi SE with custom oil tank under the seat, ohlins suspension, and the dude that owns this bike designed the fuel tank and sells them. Almost 6 gallons. It can and has been done successfully to the SE.

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