Cams update?
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By hisun junk
As I tried to do a conversion with the Yamaha 660 motor, I realized the 660 was never fuel injected so it would not work for the fuel injected hisun motor swap. But the good thing is the hisun 750 motor is a clone of the 660 Yamaha but with the components for the fuel injection (cam/crank position sensor). So that left me with a new rebuilt Yamaha 660 and still a broke 750 hisun motor. I took apart 750 think the timing chain had broke from all that I've heard about these motors. The chain was not broke, but just off cam and crank gears! The chain tensioner was at fault! I've ordered Yamaha 660 replacement parts, chain, two exhaust valves (which got bent when chain came off while motor was spinning) and seals. The piston has 2 little nicks where it had hit valves but no damage otherwise. The head is being redone at the machine shop and I'll be putting it back together in the next couple of weeks. Also I finally tracked down a Service Manual with all the info on the 550/750 Challenger.
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By hetovi
Hello everyone.
I recently bought a Can-Am Ryker and I'm looking to customize it with some accessories. I’ve seen a lot of options out there but wanted to get some recommendations from fellow riders.
What are the must-have accessories for comfort, style, or performance?
Specifically, I'm considering a windshield and better footpegs—are these worth the investment?
Also, any thoughts on storage solutions like saddlebags or rear cases?
Would love to hear your personal experiences with any mods you’ve done.
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By Fishing Wiskers
Top speed is 30mph on flat grass ground. but it will not go up minor hills forward or reverse without a runing start. If you start at the bottom of the hill machine will stop about 1/2 way up. I have the engine cover off and you can see the outside of the drive clutch will stop spining., and the engine does bogg down some. Dosent matter if engine is cold or warmed up. Seat belts are connected. Fuel is clean
I am the 5th shop to look at it and different shops have replaced the fuel pump, injector, ign coil, wet clutch,
I am not sure how to check for codes with this machine, can anyone teall me how to do it?
Compression with hot eng is 145, valves adjusted to .005 with a cold engine. Dash shows 426 hours
I am not convinced it's an engine problem
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By Joe Breaux
just an update on my MSU 500 . For all the misery it caused me the first 2 yrs, and the combination of some quality YAMAHA parts, it has now become a reliable ,useful UTV without the constant fear of having to push or tow it back from trails. I have not had a single issue pop up in a very long time.. FINALLY!....and as a side note, I just bought a C FORCE 600 ATV to replace an old and well used Honda that finally after 18 yrs gave up a rod bearing. So far the new one has really impressed me .. I like the new Power Steering and this CVT Auto Trans is new to me on an ATV .. I m used to constant shifting on my Hondas . It also has something I have never seen. Its EBS engine brake system, as soon as you let go of throttle, it engine brakes you to a stop rather quickly.. its great idea for the grandkids safety . Takes a little getting used to tho.. All in all, I like it. We shall see how durable it is after break-in.. I do "RIDE" them! .....and they honor their warrenty! and the dealer is 15 minutes away..
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By BernieG
I could really use some help identifying some disconnected components on a Yard Sport YS400. The first part is this pipe, which comes out of the exhaust port area or the cylinder. It looks like it had a piece of rubber hose on it, but the hose is gone, and I have no idea what it was previously connected to.
The second item is this vacuum valve looking thing. Again only one line is still attached. What is it's function and what other lines should be connected to it?
The last thing is this hose, which exits the side top of the fuel tank (not the fuel line hose) but is not connected to anything
Any help the community could provide would be greatly appreciated. This UTV belongs to a friend, and I am trying to help him get it running correctly for his kids.
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