BMW 1982 R100RS Project

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george baker
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Re: BMW 1982 R100RS Project

Postby george baker » Tue May 14, 2019 1:45 pm

Hi chombi
Over a year since we last saw a post on this thread and I was wondering how the tyres went

were the tyres tkc 70 or tkc80? What miles did you get?

George
Member 21, R100R, and an unused K75

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chombi
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Re: BMW 1982 R100RS Project

Postby chombi » Thu May 16, 2019 3:33 pm

Hi George,
Sorry for the delay, I've been travelling. Okay update so far.
The bike is ready. Passed an m.o.t and I'm just waiting for a mate of mine to give it a test ride to find any faults with suspension set up and more importantly the best tyre pressures to run.
I had to sought out a leaking gearshift input seal.
and get some new carb float bowl gaskets.
I've taken it up and down the road a few times and it all feels good and sounds great.
So hopefully (i know i said this a year ago hahaha) 1st june it will be taxed and on the road.
I promise to report back reference the tyres.
I've added a few recent pictures.ImageImageImageImage

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chombi
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Re: BMW 1982 R100RS Project

Postby chombi » Thu May 16, 2019 3:36 pm

Sorry George to answer your question they are tkc 80's
Currently have 28psi front and 30psi rear. Purely a start point.
Got various info internet but they all said its a case of trial and error.
Should find out more 1st week of June

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chombi
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Re: BMW 1982 R100RS Project

Postby chombi » Thu Jun 06, 2019 7:39 pm

Hi George,

So finally here is my review of the tkc 80's that are on my BMW r100rs cafe scrambler.

After 100 miles on various b-roads in Lincolnshire I can say the tyres are very stable. Good grip in the corners obviously not superbike standards but made me feel confident when I slung the bike into bends.
The tyres do brake into a very small skid if you come down the gears to aggressively nothing major, but again more a rider who still thinks he's racing his old suzuki TL1000r than tyre issues.

The tyres felt good at 60mph and at 75mph when pushing hard through some tight twisties.

I will give another update once I've got another few hundred miles on the tkc 80s.Image

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george baker
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Re: BMW 1982 R100RS Project

Postby george baker » Tue Jun 11, 2019 11:51 am

Hi
I spoke to a few people with tkc 80 tyres and told they were noisy, The TKC 70 get good reviews but neither listed for my bike by Continental

George
Member 21, R100R, and an unused K75

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CharlieVictor
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Re: BMW 1982 R100RS Project

Postby CharlieVictor » Tue Jun 11, 2019 6:14 pm

It's on wet tarmac that these tires get very funky....
1978 BMW R100S "Naked"
1999 W650 RS "Twin with a kick"

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chombi
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Re: BMW 1982 R100RS Project

Postby chombi » Tue Jun 11, 2019 7:23 pm

Yeah, they do make a sound around 50mph but I like it.
For the type of riding I'll be doing I'm more than happy with the tyres performance.

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Ruralman
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Re: BMW 1982 R100RS Project

Postby Ruralman » Wed Jun 12, 2019 8:00 pm

Love the look of the bike, i hope that she rides as well as she looks.
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chombi
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Re: BMW 1982 R100RS Project

Postby chombi » Wed Jun 12, 2019 10:53 pm

Thank you Keith,

Bike is running a little rough as i need to set up and balance the carbs.

Currently reading how to posts and blogs then when the weather finally pulls its finger out I'll start to learn the art of carb tuning.

I can already feel a bout of swearing coming on

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chombi
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Re: BMW 1982 R100RS Project

Postby chombi » Mon Jun 24, 2019 8:17 am

So after 150 miles riding heres an update on how the freshly built 1982 BMW r100rs cafe scrambler project is performing.

The bike handles well and brakes fine however the bike is still running rough.

I've checked the valve gaps, the spark plug gaps. I've rerouted and set up the throttle and choke cables and I've just ordered a strobe gun so I can check and adjust the timing before tackling the carbs.

After reading a few blogs they all suggest doing all of the above before touching the carbs.

I seem to be getting a lot of over run and popping from the exhaust. I have set the carbs up as per the haynes manual so at least I have a base start point.

I always get nervous playing with the electrics but I'll get more confident with practice and hands on experience.

I'll update the post when I received the strobe gun and checked the timing.

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DEEP DIVER
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Re: BMW 1982 R100RS Project

Postby DEEP DIVER » Mon Jun 24, 2019 10:47 am

Looking good.
I tried to be normal once, worst two minutes of my life.
Blue belt in Serious tea drinking.

Barry the old goat!!!!
1985 R80ST being rebuilt #-o
1985 R80RT Touring dream :smile:
2 Harley sportsters being rebuilt #-o
And a VW trike so I don't fall off :shock:

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chombi
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Re: BMW 1982 R100RS Project

Postby chombi » Mon Jun 24, 2019 3:01 pm

Thank you.

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Rob Frankhamr
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Re: BMW 1982 R100RS Project

Postby Rob Frankhamr » Mon Jun 24, 2019 5:06 pm

So after 150 miles riding heres an update on how the freshly built 1982 BMW r100rs cafe scrambler project is performing.

The bike handles well and brakes fine however the bike is still running rough.

I've checked the valve gaps, the spark plug gaps. I've rerouted and set up the throttle and choke cables and I've just ordered a strobe gun so I can check and adjust the timing before tackling the carbs.

After reading a few blogs they all suggest doing all of the above before touching the carbs.

I seem to be getting a lot of over run and popping from the exhaust. I have set the carbs up as per the haynes manual so at least I have a base start point.

I always get nervous playing with the electrics but I'll get more confident with practice and hands on experience.

I'll update the post when I received the strobe gun and checked the timing.

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Hate to say this but popping from the exhaust on the over-run is pretty much a classic symptom for insufficient exhaust back pressure. There may be other causes but if the rest of the engine is pretty much stock, you may need to revisit that area.

Rob
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windmill john
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Re: BMW 1982 R100RS Project

Postby windmill john » Tue Jun 25, 2019 6:35 am

I would say pipes way to open, therefore carbs running too lean is also another area to look at.

Rob also on the other right track. My Transalp has one of those silencers held on by a spring; not my choice. Due to that fit not being the tightest, that also introduces some ..... burbling. Not too bad, but will address when I take the silencer off for some reason.
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Sold my Airheads, what an idiot, but Honda is also great.
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chombi
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Re: BMW 1982 R100RS Project

Postby chombi » Tue Jun 25, 2019 9:57 am

Thank you very much for the info, I've already put baffles into the exhaust as they were straight through and very very loud.
But I think they need repacking again so I will do this before I check and re-set the timing. Then at least I've ticked all the boxes before tackling the carb set up.

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chombi
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Re: BMW 1982 R100RS Project

Postby chombi » Tue Jun 25, 2019 10:46 am

Any other advice will always be gratefully recieved

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george baker
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Re: BMW 1982 R100RS Project

Postby george baker » Tue Jun 25, 2019 12:11 pm

Hi try the original sciencers as a test fit?.
G
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chombi
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Re: BMW 1982 R100RS Project

Postby chombi » Tue Jun 25, 2019 1:34 pm

Hahaha they are long gone George, however I have just re-wrapped my removable baffles and the bike sounds like its running better.
Still popped a few times through. Can't go out for a ride today as the weather is crap.
But I've done everything on the checklist accept the timing and hopefully the gun should arrive tomorrow.
Once I've checked the timing and made any necessary adjustments it's onto the carbs.
So if the bike is still running rough after that I'll be looking at a refresher kit for the carbs.

Do you think that's a logical step or is there something else you think i should be checking ?

Again advice gratefully recieved.

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windmill john
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Re: BMW 1982 R100RS Project

Postby windmill john » Tue Jun 25, 2019 2:06 pm

Can't go out for a ride today as the weather is crap.

WHAT!!!!! This is a BMW forum. Geroff! :grin:

I thought you wanted to test those tyres :wink:
http://www.kittos.co.uk
Best roads: 623 Burgos to Santander. A back road to Metz; can't remember which!
Bumble, my 700 Transalp.
Gupta, my 350 Royal Enfield.
Sold my Airheads, what an idiot, but Honda is also great.
Too many bikes have come and gone, trying to be sensible now!

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chombi
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Re: BMW 1982 R100RS Project

Postby chombi » Tue Jun 25, 2019 2:16 pm

Hahaha ok you got me. It was my birthday at the weekend and I'm still recovering

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chombi
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Re: BMW 1982 R100RS Project

Postby chombi » Tue Jun 25, 2019 2:16 pm

I was just wondering what fuel people are using and could that in anyway affect the bike ?

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windmill john
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Re: BMW 1982 R100RS Project

Postby windmill john » Tue Jun 25, 2019 2:26 pm

Bings are quite forgiving, so it would be hard to tell. The only thing I can say is that a Suzuki I used to have hated Shell. I tested it and wasn't imagining it; could have been that specific garage I guess.
http://www.kittos.co.uk
Best roads: 623 Burgos to Santander. A back road to Metz; can't remember which!
Bumble, my 700 Transalp.
Gupta, my 350 Royal Enfield.
Sold my Airheads, what an idiot, but Honda is also great.
Too many bikes have come and gone, trying to be sensible now!

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chombi
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Re: BMW 1982 R100RS Project

Postby chombi » Tue Jun 25, 2019 2:27 pm

Thanks John

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Rob Frankhamr
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Re: BMW 1982 R100RS Project

Postby Rob Frankhamr » Tue Jun 25, 2019 8:21 pm

If you are going to go down the fuel brand route and do comparitive tests, try to avoid supermarket pumps. If you use a Shell station, you'll probably get Shell fuel, if you use Gulf then you'll probably get Gulf, if you use (for instance) Sainsbury's you'll get fuel from whichever company will give them the best discount this week.

Rob
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chombi
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Re: BMW 1982 R100RS Project

Postby chombi » Tue Jun 25, 2019 8:54 pm

If you are going to go down the fuel brand route and do comparitive tests, try to avoid supermarket pumps. If you use a Shell station, you'll probably get Shell fuel, if you use Gulf then you'll probably get Gulf, if you use (for instance) Sainsbury's you'll get fuel from whichever company will give them the best discount this week.

Rob
Thanks you Rob.

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