BMW F650 complete overhaul of a set of carbs.|

Here we take a pair of carbs from the BMW F650, and show how you strip and repair them. This is quite a standard approach to the overhaul of a set of carbs. So, it is possible to gain the info from this video.
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[@kateshaw-hy5qo]

Thanks for checking.

[@RestorationBiker]

You are more than welcome, shame I couldn't help you.

[@ilinkolov1]

Great video! I wish it was there 15 years ago, when I bought my '98 Aprilia Pegaso. So far I have 2 donor carbs to keep it running (one BMW's and one Aprilia's). What is the book you are checking in the video, is it for BMW only?

[@RestorationBiker]

Thanks for your comments, I really enjoyed making this video. The book is the Clymer workshop manual for the F650 series of bikes. I normally like to use the official workshop manual, but I had this manual on hand when I made the video so I thought it would be good to put it into shot.

[@boris2919]

Damn that was very informative ! I'm in the process to clean mine after buying the same motorcycle. One main jet was in 130 and the other 140, all the oil air mixture screen were badly tunned. I found the pdf version of the same service manuakl as yours but it help so much to have someone with great experience showing all the part and explaining why and how it should work. Thank you so much :)

[@RestorationBiker]

Glad it helped you. Thanks for the nice comments

[@baz5806]

Very helpful.. I'm about to do mine when the seal kit arrives. Now i know what to look for, thanks! 👍

[@RestorationBiker]

Glad it helped

[@G58]

If you’re struggling with the screws it might be because they’re not Philips. If it’s a Japanese Kehin or Mikuni, the likelihood is that the screws are actually JIS (Japanese Industry Standard). If so, you need a set of JIS screwdrivers. Vessel make good ones. That might be why the screws were already mashed up when you got them. Most of us learned from such mistakes in the mid 1970s…! 👀🧐😎😜

[@RestorationBiker]

Hi Many thanks for your comments. Yes, you are right. I have a large collection of screwdrivers to ensure I get a decent 'grip' when using them. I did not know that they were JIS, your experience is better than mine. Some people make a real mess by using the wrong tool, and then we have to try and remove it so that we can then replace it with a new part..

[@G58]

@@RestorationBiker The differences are subtle and difficult to see with the naked eye. But if you Google it there are decent diagrams detailing the angles and proportions of each. The Philips screw heads were actually designed for the screwdriver to cam-out under too much torque - because they were intended for wood screws, not machine screws. The tightening (and loosening) requirements are totally different. This means that there are two opportunities to ruin the heads by using the wrong screwdrivers. One of the greatest failures of the Japanese system is that it failed to adequately market the JIS system globally. Or rather the rest of the world failed to pay attention. Vessel is regarded as a niche manufacturer, yet back in the day it was Vessel’s impact drivers (with brittle NON JIS bits) which we bought from Exchange & Mart, to extract the JIS screws from our Hondas, Yamahas, Suzukis etc. Kawasaki riders didn’t live long enough to work on their engines…!👀🧐😎😜

[@RestorationBiker]

@@G58 Brilliant information. I have never got too involved in the whys and wherefores of these sort of things, but I find it fascinating to read how and why things were designed and made in a certain way.. Thanks for the info.

[@G58]

@@RestorationBiker Cool. Good Design, business models, historical facts, information and data are the things I live on. Ride safe

[@RestorationBiker]

@@G58 Thank you for all the info. I love to know interesting facts like that.

[@dionysiosp.kefallinos6691]

If you knew how much you helped me... many thanks!

[@RestorationBiker]

Hi, brilliant, that is why I like to do these videos if they help others do a job I am really pleased.

[@DavidPrice-q3j6e]

Do a video on all vacuum hose locations

[@RestorationBiker]

Yes, that is a good idea, especially on those carbs as quite a few people get confused with the hoses on those carbs.

[@Julko88]

still very helpful. Looks like mine carbs gives to rich mixture, so it's time to check them. Thanks for the instruction!

[@RestorationBiker]

Hi, glad it was of use to you.

[@richardfields3248]

i have a 1998 bmw f650st i overhauled the carbs but cant get the bike to start only if i spray brake clean cant get the left carb to work the float looks good any ideas

[@RestorationBiker]

Hi, This could be a number of things, but as the bike runs with brake cleaner forced into the manifold it confirms that it is fuel delivery. So, as you have rebuilt the carbs, it could be fuel supply. The fuel tap at the tank, or the breather in the fuel cap!. Try setting up a remote fuel supply to the carbs, and see if that alters anything. It may be a 'sticky' needle valve in the carbs too. Check the amount of fuel in each carb by removing the float bowl drain screw.

[@01101101011010010111]

Thank you for the vid, my pegaso has been shutting down when i blip the throttle and possibly one of my diaphragms is not good. Its also running a bit lean on lower revs and this video gave the confidence to dissassemble them when i get the seal kit. TY.

[@RestorationBiker]

Hi, Brilliant ,nice to hear that it is helping you.

[@expatbiker1907]

Proper job!! thanks a lot. Have just picked up a Funduro thats running a bit "lumpy" ! will let you know how it goes.

[@RestorationBiker]

Great to hear. Be interested in what you find

[@laurentiutanase410]

Hi ! please , where should i know to set needle ? mine i don t like to work after i cleaned carbs . thanks . great video

[@RestorationBiker]

Hi, The best place is to look in the workshop manual as sometimes they are supposed to be fitted in a different place to what you may think.. Most needles are set in the middle setting. But on this bike the manual stated that it was in a different position. So, it was good job I looked.

[@carlosgleonphdest6119]

Thank you very much for the video. I have an identical motorcycle, it started to give me problems, it does not allow me to accelerate, I will see if with the support of your video, I can solve it. Thank you.

[@RestorationBiker]

Hi, Yes, these carbs can be very troublesome. Just take your time, and if you can replace the 'O' rings that go under the float valve seat. and check the breather is clear.

[@carlosgleonphdest6119]

@@RestorationBiker my friend, if your advice worked! I really appreciate your video, it is a great source of inspiration to spend time on the bike instead of watching TV my friend, if your advice worked! I really appreciate your video, it is a great source of inspiration to spend time on the bike instead of watching television. Thank you!

[@floridahydrologicconsultin1680]

Good video , thank you. Im sure we have posted the best gasket kit in so far.

[@RestorationBiker]

Hi, Glad you enjoyed it.. Yes, the best kit so far.

[@josiahgovender1855]

Hi how do you take our the main jet under the flat head screw in the float bowl

[@RestorationBiker]

The flat head screw is the main jet. The other jet in the tube is the emulsion tube and can be 'tapped' out. They do not always come out that easily.

[@kateshaw-hy5qo]

Hi, great video. I need a float bowl for my f650 and struggling to find a new or s/h one from the usual suppliers. Would you consider selling the alloy float bowl casting from one of your carbs ?

[@RestorationBiker]

Hi, I would be more than happy to sell them, but I have already sold those carbs some time ago. I have just gone and had a good sort through all my remaining F650 spares, just to see if I had one. I did find a lot of new carbs parts, etc, but unfortunately no float bowl. So sorry, as I would love to help. Have you tried Motorworks, as they do a lot of s/h parts, as well as new BMW stuff. they are a great company. If not try motobins

[@kateshaw-hy5qo]

@@RestorationBiker Hi, thanks for your prompt reply. Unfortunately I have tried Motorworks etc and no joy. I will keep trying 😀. Thanks again.

[@RestorationBiker]

@@kateshaw-hy5qo I will trawl through my stock of spares this weekend to see if I have anything that may help you. Kind regards.

[@corymichael8445]

How do you disconnect the throttle when taking the carb out?

[@RestorationBiker]

Hi, I always remove the carbs then remove the cable once the carbs are off. That way you get more room to move and it is easy to see what you are doing.

[@remyassier1758]

Thanks for this video could you please tell me what is the book reference u used

[@RestorationBiker]

Hi, I have the Clymer manual for the BMW F650 range. That is what I was using for the specs for the settings It is a good useful book on these bikes.

[@remyassier1758]

@@RestorationBiker thanks and ride safe

[@corymichael8445]

Just curios as to what work shop manual you are using in this video? I have the Haynes but I'm not seeing anything in detail about the main jet and number of turns.

[@RestorationBiker]

Hi, I am using the Clymer manual for this job. It is much more in depth. Usually when you rebuild carbs the basic setting is 1.5 turns out. But on reading the manual it says 4.5 turns. My first reaction was 'Really??' But yes that is the correct number of turns out for the pilot air screw. I have the Clymer soft backed version of the manual

[@corymichael8445]

Awesome thanks. I just opened the float chambers and I'm only seeing one pilot jet (located on the right chamber) the left chamber has no jet. It's a mikuni bst33 dual carb for a 97 Funduro.

[@RestorationBiker]

@@corymichael8445 Hi, There should be a pilot jet in each carb. They should be a mirror image of each other.

[@corymichael8445]

WOW, I can't believe it ran all these years with only one pilot jet.

[@RestorationBiker]

@@corymichael8445 Wow that is amazing.

[@simoncrooks7441]

Thanks, very informative

[@RestorationBiker]

Many thanks glad you enjoyed it

[@cbsakias]

Nice vid thanks for this precious lesson!

[@RestorationBiker]

Glad you found it useful. Many thanks.

[@bernieclips9003]

Great video 👍 I'm trying to figure out where the hoses connect. The right side there are two outlets right above the bell mounts and there is one outlet above the diaphragm. On my bike I have two hoses running to the exhaust and 1 hose running to the vacuum. I'm guessing the one hose that runs to vacuum connects to the outlet by the diaphragm and the other two outlets connect to the exhaust hoses?

[@RestorationBiker]

Hi, From memory (I haven't got my F650 now) there are a couple of hoses going from the carbs. One near the diaphragm is a breather and is open to the atmosphere. The other is the fuel delivery pipe which goes to the float bowls via a split delivery system.. Not sure what hoses you are mentioning that go to the exhaust. If you can send me a picture I may be able to help further

[@bernieclips9003]

Sure can. Do you have an email?

[@RestorationBiker]

@@bernieclips9003 Hi, I don't have an email for this account. The only way to contact me it seems with pictures or videos, is via my patreon account.

[@bernieclips9003]

I made a short video. m.kzbin.info/www/bejne/q6LSYol4j5Vla9E Can you me a link to your patreon acct. When you get a chance thanks.

[@bernieclips9003]

Also would like to get a work shop manual. Do you prefer Haynes or Clymer's?

[@kateshaw-hy5qo]

Appreciate that, thank you.

[@RestorationBiker]

My pleasure!

[@RestorationBiker]

Hi, I had all my Funduro stuff out at the weekend. Found quite a few carb bits, but no float bowl unfortunately, sorry.

[@marsu52]

Merci beaucoup 👍

[@RestorationBiker]

Bon chance mon ami

[@tonebonetones]

Lol.....I bought a carb kit for my '99 F650ST last year, and put off doing them, as apparently they are notoriously tough to get off the F650, and my bike runs OK (although I have to make sure I turn the petrol stopcock off, or the bike floods and it's a pain to start). This video is an incentive to get the job done....once the snow and frost goes.

[@RestorationBiker]

Hi, Yes, the repair of these carbs is fairly easy. Just take your time. I know what you mean about they are a pain to remove, and re-fit. The secret is don't take the airbox off. Sounds impossible but try it and see. If the weather is cold you can make it easier by using a hairdryer on the rubbers to soften them up. They are impossible to work if they aren;t heated first. I may do a carb remove video to see if it will help. Thanks for the post. Take care, looking forward to getting back out on the bikes.

[@Momab]

@@RestorationBikerdid you make a vid for remove carb

[@iainhamilton4482]

Great instructional video - now i will confidently take mine apart and inspect - bike starts and idles fine but dies on revs. Thank you.

[@RestorationBiker]

Excellent thats exactly why I do these videos. To help other motorcyclists maintain their bikes. If you get any problems, feel free to send me a message and I will do my best to help. These bikes can get the problem you describe when the reg has died. Take care.

[@iainhamilton4482]

Did as you indicated in the vid, slow and clean thoruoghly, - bike started up and now revs fine for the first time in 2 years - thanks again

[@RestorationBiker]

@@iainhamilton4482 Brilliant, glad to hear it helped you. 1st class.