Hello all. Since it has been pretty hot here, I went riding really early in the morning. My staging area is next to a highway and I could not resist the empty highway. The question has been raised by my riding buddies about top speed of my Berg. So I took out on the open road and let'er rip. The engine pulled hard all the way into 6th gear then would not rev out, which was ok, I was doing 85mph anyway. The road had a dip that got 6th to rev out and a top speed of 90mph, but then the engine shut off! It did not sieze, it was like some one turned the ignition off. I pulled in the cluch and let the bike coast, then let the clutch back out and the motor refired. While hanging the throttle open this long would not be considered a normal operating condition for me, it has my curiousity up. I think the float bowl got sucked dry, what do you all think?
The first thing that comes to mind is the crankcase vent. Have you modified the vent yet, or is it still connected to the air intake system? I don't know how the newer Bergs are, but the older ones were notorious for sucking oil into the intake system especially during high rpm running causing symptoms identical to the ones you experienced.
Joined Nov 2001
17K Posts | 774+
Ely, England
no, no, no, no and no boys!!!!!
it was the plug. 99% certain. they aren't designed for that kind of work and it stopped functioning due to being too hot. as you won't be doing this again you should be ok. however there is the chance that the bike will now be very hard to start and stall a lot.
that will mean time for a new plug. if you do want to ride like that again you will need a plug with the number up one so a 7 would be an 8 and an 8 a 9 etc. only champion go the other way with their codes.
to me the problem isn't so much that the plug minds that kind of work it's that it's not used to it and has built up carbon deposits etc to go with slow and normal riding.
regards
Taffy
it was the plug. 99% certain. they aren't designed for that kind of work and it stopped functioning due to being too hot. as you won't be doing this again you should be ok. however there is the chance that the bike will now be very hard to start and stall a lot.
that will mean time for a new plug. if you do want to ride like that again you will need a plug with the number up one so a 7 would be an 8 and an 8 a 9 etc. only champion go the other way with their codes.
to me the problem isn't so much that the plug minds that kind of work it's that it's not used to it and has built up carbon deposits etc to go with slow and normal riding.
regards
Taffy
shut down
Thanks for the replys, I did not check the plug yet, but the bike was a little more stall prone after that, but did start ok. I will replace the plug anyway. It is safe to say that the bike will never see a run like that again, unless I go to the salt flats( not likely). I was already planning on cleaning the petcocks and replacing the inline fuel filters. I also had a thought about the fuel tank vent, I am running check valve, not an open hose, and mabey the engine was sucking fuel faster than the check valve could relieve the tank. Thanks again.
Thanks for the replys, I did not check the plug yet, but the bike was a little more stall prone after that, but did start ok. I will replace the plug anyway. It is safe to say that the bike will never see a run like that again, unless I go to the salt flats( not likely). I was already planning on cleaning the petcocks and replacing the inline fuel filters. I also had a thought about the fuel tank vent, I am running check valve, not an open hose, and mabey the engine was sucking fuel faster than the check valve could relieve the tank. Thanks again.
Dont like to dissagree Taf, but being a hoot toot of enormous magnitude, i regularly hold my bikes flat in top and have never had that kind of problem, weston beach race, trail riding around cornwall, hell i went to a drag race on the 550 last week! The top speed also sounds low to me, unless it was actually reving out without you realising it. Me 400 enduro does 94, the old 501 was 103 and the 550 crosser had 114. all at a local drag race over the years by timing light. i've maybe been lucky who knows? mind you i do run 8's in all the bergs anyway........
shut down
Crashnberg, My mph was registered on a TrailTech endurance odometer, so it my not be that accurate, also to put it kindly...I am not so...aerodynamic?...6'2" and around 275lbs... tends to slow the top speed a bit. I was hoping for more speed but in reality I will never see 90 in the dirt anyway, I have gotten off at those speeds before, and do not need to again. :toothless:
Crashnberg, My mph was registered on a TrailTech endurance odometer, so it my not be that accurate, also to put it kindly...I am not so...aerodynamic?...6'2" and around 275lbs... tends to slow the top speed a bit. I was hoping for more speed but in reality I will never see 90 in the dirt anyway, I have gotten off at those speeds before, and do not need to again. :toothless:
some answers
OK all, just got in from the garage and here are some issues that I found. #1 Removed the spark plug, found oil evidence of oil fouling, I am running the stock crankcase breather. At high rpm the carb may have got a shot of oil. #2 The petcocks were very dirty in the lever area. I had noticed the petcock levers were getting difficult to move. While draining the fuel from the gas tank, I noted a very slow flow rate from the tank. After back tracking up the fuel line to the petcock. Inline filter is clean, petcock screen is clean, but the sticky lever was not turning to the full open position and restricting fuel flow. After disassembling the lever assembly I was suprised by the amount of dirt around the wave washer and teflon seal, also dirt had worked past the seal and was binding up the lever. A quick clean up and now they are smooth as silk. Hope this helps.
OK all, just got in from the garage and here are some issues that I found. #1 Removed the spark plug, found oil evidence of oil fouling, I am running the stock crankcase breather. At high rpm the carb may have got a shot of oil. #2 The petcocks were very dirty in the lever area. I had noticed the petcock levers were getting difficult to move. While draining the fuel from the gas tank, I noted a very slow flow rate from the tank. After back tracking up the fuel line to the petcock. Inline filter is clean, petcock screen is clean, but the sticky lever was not turning to the full open position and restricting fuel flow. After disassembling the lever assembly I was suprised by the amount of dirt around the wave washer and teflon seal, also dirt had worked past the seal and was binding up the lever. A quick clean up and now they are smooth as silk. Hope this helps.
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