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Author Topic: 1979 R45 - 860cc Siebenrock upgrade kit. Any experiences ?  (Read 309 times)

Offline tedmagnum

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Re: 1979 R45 - 860cc Siebenrock upgrade kit. Any experiences ?
« Reply #15 on: January 04, 2022, 01:50:56 AM »
For those who are interested.

Fitting the Siebenrock totally cured the problem with the racing engine.  I can't say exactly how or why. But it did.

For those fitting an 860cc to an R45,  the kit fits perfectly and works well.   I had to contact Siebenrock for confirmation. Such as whether to fit the large o-ring to the base of the cylinder (In my case not as it's early 1980 model). The bike does rev up EXTREMELY quickly though. In a good way. I think a longer ratio bevel box may be beneficial in the long term though.

I up jetted one size and it seems to be correct.

I sold the bike a few days later. A friend tore my arm off once he saw the engine work.

All in all, I was extremely impressed with the quality of the kit. Excellent and accurately engineered. I wouldn't hesitate fitting another.

Offline dogshome

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Re: 1979 R45 - 860cc Siebenrock upgrade kit. Any experiences ?
« Reply #16 on: January 04, 2022, 06:43:49 AM »
Nice one. Glad its fixed and thanks for reporting back  :bmw_smiley:

I'm just about to fit an R80 final drive to my 860. The ratio is not much different from early 650 to early 800, the 31/9 to 37/11 is only what the later 650 had anyway. I can imagine 35/9 or 38/8 that the 450 comes-with DOES rev up fast with 860 kit.
肉(r?u)包(bāo)子(zi)打(dǎ)狗(gǒu) (meat+bun(2nd and 3rd)+hit+dog)
* Literally: To hit a dog with a meat-bun.:-O

Offline Adrian

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  • The Old Hairy Biker Sez...
Re: 1979 R45 - 860cc Siebenrock upgrade kit. Any experiences ?
« Reply #17 on: January 04, 2022, 08:07:07 PM »
Hi there - I have the 860 kit fitted to my rebuilt R65.
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Without any real detail - I'm a bit long winded usually - I am very pleased with the result. More power for two up riding & my favourite place the Adelaide Hills.
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It will transform the bike 👍😊
1984 R65 (860)