Hey guys I'm new here and to riding. I bought a 06' BF750 and it ran great. We made a couple of rides and had no problems. Unloaded it the other day and when to start riding and it is making a knocking noise when accelerating not when idling in neutral or being revd in neutral either. I changed the oil, took the carbs off and cleaned them thoroughly. The bike starts right up but knocks when driving any help is greatly appreciated! I found a YouTube video that shows it perfectly. This video is not my bike just the same situation. I couldn't figure out how to put it in here so here is the link. Thanks guys!
Brute knocking when accelerating!!
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Take the belt cover off and inspect the belt. It might have a piece hanging off slapping the inside when your moving.
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Thanks, I took the belt cover off just now. It's got a couple wear spots but nothing hanging. It's definitely coming from in there though. I rode it around the yard with it off to listen and it clacks it when I hit the gas and feels like it reduces power a lot.
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7,484 Posts
She's done. It's either loose rod bearings or completely gone chains and tensioner bars. Talk to N-flow on rebuilding.
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Well, just to make sure, take the primary off and start it. If the sound is still there, don't run it anymore. If it throws a rod, then you are looking at a new case.
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That sucks.
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The first thought was a rod knock.
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Was hoping for a clutch swap or something easier. It started smoking pretty heavy thick white grey smoke too.
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Anyone have any ideas on how much it costs to fix?
---------- Post added at 01:39 PM ---------- Previous post was at 01:14 PM ----------
Anyone have any ideas on how much it costs to fix?
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Talk to n-flow. It will be right.
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theres a couplle of builders in the south that can beat that price
dont know where you are shipping might be a problem
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NMkawierider, thank you for the recommendation! Mikescar1, we can get your engine to like-new and back out riding in about 14 days from when we receive your engine. We can completely reman the BF 750 engine for $2,795 with Free Shipping both ways in the lower 48 states. Our reman process includes a complete tear down of the engine, washing and media blasting, replacement of worn/damaged components, in house CNC machine work, reassembly by our skilled techs, final inspection/testing, and shipping back to your doorstep. All you have to do is strap the engine to a pallet and we take care of the rest including arranging all shipping logistics. If you give us a call at 812-402-8282, C.W. will be happy to answer any questions about how the process works. We reman about 1,000 powersport engines per year so our techs are well versed in the BF 750. Thanks.
Just an update, I went ahead and tackled it myself. Got down the rods and crank, bearings and rods looked good with no slack or slipping. I did have a broken tensioner guide on the front cylinder timing chain and the timing on the front was off 180 degrees. Went back with all new gaskets, fixed timing and new guide. Had some stretched piston rings and swapped those. Got it back together and adjusted my valves last night. It cranked up, I haven't rode it yet will check tonight and see if everything checks out.
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