No top end power on my CBR1000F
#11
03-22-2009, 05:07 PM
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Carb boot ribs
Thanks Shadow, I will look at those boots. I was going to take off all that smog stuff, but I was not sure if it could cause a problem. I see that there are 4 vacuum ports on the top side of the 4 carbs (one per carb) and 2 vacuum ports that hook in at the rear of the 2 middle carbs. Then, of course there is one vacuum port that goes from the number 1 carb (side of it) to the fuel petcock vacuum port. I am assuming that if I cap all 6 carb ports (4 tops and 2 back ports) and leave the line to the vacuum petcock port (so fuel will flow 
), I will have eliminated all the vacuum leak possibilities and the California smog stuff can be removed.
Am I right if I cap the 6 vacuum ports (numbers 1 & 4 are already capped) and remove the other "spaghetti western" hoses, I will have removed the California smog stuff???
Thank you for the link, I will buy new carb boots from them if I have the ribbed type (if someone has not replace them already on previous maintenance work).
I am glad to hear that a good running CBR1000F will "spank" a TL1000S.
That puts a smile on my face because now I know that if I do all the work that this poor old gal needs, I will end up with a superbike and not just a bike that keeps up with my slow R1100RS!!!
By the way, I have been riding bike since 1974 and the CBR1000F is the first bike that fits me like a glove. It is the most comfortable bike that is agile to ride and has power enough to make me smile. Beats my old Valkyrie (weighing in at 800 lbs!) and has all my old Harleys sitting in tears, even my old 1200cc Thunderstorm head Sporty. Yes, I have had over 30 bikes and have had 10 bikes in the garage at once!!! Motorcycles are my fever in life, I guess.
I am open to all suggestions for this old gal. CBRclassic, I will look into a new K&N filter since Shadow and you think the foam one is not that good. The Uni foam filter came with the bike and was new so I did not question it, but now it is out of here!
), I will have eliminated all the vacuum leak possibilities and the California smog stuff can be removed.Am I right if I cap the 6 vacuum ports (numbers 1 & 4 are already capped) and remove the other "spaghetti western" hoses, I will have removed the California smog stuff???
Thank you for the link, I will buy new carb boots from them if I have the ribbed type (if someone has not replace them already on previous maintenance work).
I am glad to hear that a good running CBR1000F will "spank" a TL1000S.
That puts a smile on my face because now I know that if I do all the work that this poor old gal needs, I will end up with a superbike and not just a bike that keeps up with my slow R1100RS!!!
By the way, I have been riding bike since 1974 and the CBR1000F is the first bike that fits me like a glove. It is the most comfortable bike that is agile to ride and has power enough to make me smile. Beats my old Valkyrie (weighing in at 800 lbs!) and has all my old Harleys sitting in tears, even my old 1200cc Thunderstorm head Sporty. Yes, I have had over 30 bikes and have had 10 bikes in the garage at once!!! Motorcycles are my fever in life, I guess.
I am open to all suggestions for this old gal. CBRclassic, I will look into a new K&N filter since Shadow and you think the foam one is not that good. The Uni foam filter came with the bike and was new so I did not question it, but now it is out of here!
#12
03-22-2009, 08:10 PM
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Since you've pulled the filter, the next thing I would do is pull the spark plugs. If they look bad, you may have a carb problem. If they look good, you probably have an ignition advance or compression problem. The ignition advance can be checked using any old timing light. If the timing is staying at TDC (the "T" mark), then the Pulse Generator is bad (about $50). If the timing advances from the "F" position to the mark to the right, then the timing is good.
If the compression is bad, it could be that the cam chain has stretched. A common occurrence on the 1000F. Or the valves could be leaking or the rings....
If the compression is bad, it could be that the cam chain has stretched. A common occurrence on the 1000F. Or the valves could be leaking or the rings....
#13
03-22-2009, 09:33 PM
There are a few factors that come into play with top end runs. Besides engine considerations wind, road slope, and air resistance come into play. My '91 will still be pulling pretty hard at 135 mph or so in 5th gear on a level road in still air with just me on it. Put hard luggage on, choose a stretch with a slight uphill run and a fifteen or twenty mph headwind and it works hard to run much faster than 125.
One of the early tests (1988) reported a top speed run of 161 mph, but indicated that if even a toe was exposed to the slipstream 5 mph would be lost.
Incidentally, one of the tuneup items you didn't mention was balancing the carburetors. That should come after plugs, wires, valves, carb check, etc. It can make a difference.
One of the early tests (1988) reported a top speed run of 161 mph, but indicated that if even a toe was exposed to the slipstream 5 mph would be lost.
Incidentally, one of the tuneup items you didn't mention was balancing the carburetors. That should come after plugs, wires, valves, carb check, etc. It can make a difference.
#14
03-22-2009, 11:30 PM
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Carbs, compression, cam chain, etc
I checked the plugs and they look great. I called the previous owner and he said he just had the carbs balanced. I was just about to pull the carbs today (had all the vacuum lines marked and the boot clamps loose), then I called the old owner. I think the carbs are fine since the plugs look perfect and there is no popping or misfiring and he said he just had the carbs balanced.
The Nevada desert is always windy! The fact that I might be going against a slight head wind and a slight up hill grade might be a factor that I am overlooking.
I may not have been paying attention to the physical factors against the machine.
Before I put this thing all back together and eliminate any winds and uphill problems, I will do a compression check. Low compression would cause weak torque and a loss of power.
I sure like to ride the CBR-F..... Thanks for all the help! I will go through all the tips above and eliminate all the possible problems. Might be late this week before I am done, but I will take it out after all the tests/repairs and give all of you my findings/results in a follow-up post..... Take care all.....
The Nevada desert is always windy! The fact that I might be going against a slight head wind and a slight up hill grade might be a factor that I am overlooking.
I may not have been paying attention to the physical factors against the machine.Before I put this thing all back together and eliminate any winds and uphill problems, I will do a compression check. Low compression would cause weak torque and a loss of power.
I sure like to ride the CBR-F..... Thanks for all the help! I will go through all the tips above and eliminate all the possible problems. Might be late this week before I am done, but I will take it out after all the tests/repairs and give all of you my findings/results in a follow-up post..... Take care all.....
#15
03-24-2009, 11:27 AM
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When you crack the throttle, try to look back, and see if ther eis black smoke coming out of the pipes. If is it, they it's running very rich. You could also pull a spark plug and look at the colour too. It should be light brown/beige. Dry black means rich, wet black is excessive oil consumption, white is lean.
#16
03-25-2009, 04:44 PM
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Follow up on the problem of NO TOP END SPEED
Well, I took the carbs off and took a good look. There were a few things wrong with the bike that the person who sold it to me said, "Just had the carbs cleaned and balanced." I think he meant degunked on the outside and sea foam gas additive on the inside - only!
Two small vacuum lines were cracked (one is under the carbs on this California smog equipped model) and leaking. The carbs had sediment inside the bowls and one main jet was 3/4 plugged from California crud.
The funny thing is the bike idled fine and would accelerate good, but lost the top end performance. Oh ya, it was hard to start and now it starts right up. I guess the vacuum leaks stopped the petcock from flowing fuel well and at high speeds the lack of strong vacuum didn't let the diaphram open all the way for fuel to flow enough for the carbs to fill completely. Also, the one main jet that was plugged made for a weak top end. So, thanks all for your input and remember, "You can fool all of the people some of times and some of the people all the times, but when it comes me, well I can at least fix the thing with the help of a few brothers/sisters on bikes!"
Two small vacuum lines were cracked (one is under the carbs on this California smog equipped model) and leaking. The carbs had sediment inside the bowls and one main jet was 3/4 plugged from California crud.
The funny thing is the bike idled fine and would accelerate good, but lost the top end performance. Oh ya, it was hard to start and now it starts right up. I guess the vacuum leaks stopped the petcock from flowing fuel well and at high speeds the lack of strong vacuum didn't let the diaphram open all the way for fuel to flow enough for the carbs to fill completely.
Also, the one main jet that was plugged made for a weak top end. So, thanks all for your input and remember, "You can fool all of the people some of times and some of the people all the times, but when it comes me, well I can at least fix the thing with the help of a few brothers/sisters on bikes!"
#18
03-25-2009, 07:27 PM
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Your gonna see some serious shyte !!!
http://www.youtube.com/watch?v=BytKSy8M4bk
Last edited by CBRclassic; 03-25-2009 at 08:16 PM.
#19
03-25-2009, 08:22 PM
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Last time I was in Nevada was in '01 and was towing a heavy trailer. In the higher elevation the piuckup truck was pinging (detonating) like crazy and had to use premium fuel to have the engine run quiet. Also it was really weak cause of the high temps (+40C) and high elevation (lack of O2). Your bike will feel weaker too than if it was at sea level but it shouldn't have any problems getting up to at least 230km/h.
#20
03-28-2009, 01:04 PM
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Test ride today
Well Brothers and Sisters, I took the beast out for a test ride after doing the carbs and vacuum stuff. The day was 65 degrees F, no wind and sunny as all get out. Tire pressures up to snuff, chain oiled, fuel topped off with fresh middle grade (89 octane) fuel and so I opened her up on the deserted highway stretch.
The results? At 9,000 rpm and 150 mph (240km/h), I decided that it is fixed. It was still pulling so I know this puppy can do 160 mph. I then proceeded to turn around a try it in the other direction. I had to pass a few cagers, but at 155 mph, the bike sang the songs of the Sirens that Ulysses listened to (music to my ears) so I closed her down and put her away.
Thanks for all the help. Nevada
The results? At 9,000 rpm and 150 mph (240km/h), I decided that it is fixed. It was still pulling so I know this puppy can do 160 mph. I then proceeded to turn around a try it in the other direction. I had to pass a few cagers, but at 155 mph, the bike sang the songs of the Sirens that Ulysses listened to (music to my ears) so I closed her down and put her away.
Thanks for all the help.
Nevada