carb or clutch??????????????

[mgc1953]

Here goes - so I finally got the MaxIV together and ready for a test today. It has a G50B Chaparral with a 34mm Mikuni, 26 inch tires and I am at about 5000ft elevation. Last weekend I just ran it around the yard a bit and spit out a few cool donuts. seemed to be running great. Today I took it in the hills and it seemed to run pretty good on the flat but didn't seem to be opening up all the way. If I stopped and revved er up it would top out no problem but as soon as I aimed her at a hill it would just die off and bog down to nothing. same thing in the water. As soon as the tires hit the water it would bog down to nothing. Clutches seem to be opening and closing like they should. anybody have any ideas?

[mgc1953]

Her's a video that shows what I'm talking about --

[Mike]

Was that engine stock in your Max or was it added later? Just wondering if the correct clutches are on the machine?

[mgc1953]

I'm not sure Mike, I called RI with the serial number and they told me it was an 89. Will they be able to tell me if that was the stock engine? How can I check the clutches to see if they are the right ones?

[Mike]

They may be able to tell you what motor was stock in the machine based on the serial number but I don't know for sure. I was really asking to see if you had changed anything yourself. I'm just fishing for things that could be wrong. Have you tested the compression of the engine? That may be a good thing to do since it is easy to do and inexpensive.

[mgc1953]

I'll check the compression. I did put on a remote air cleaner it's about a 2 foot hose and then the air filter -- I'm thinking that may be the problem,-- starving for air under load.

[Mike]

That may be worth a shot just to remove it completely while you test things out.

[jerbear]

Does this seem to act up after the engine warms up? You said it ran good for a couple quick donuts. When you took it to the hills did it get hot and then start acting up? In that case could be a bad crank seal, loss of vac, and then loss of fuel from fuel pump.

[micmac]

If it is truly an 89 I'm sure it's not the original engine. However it might be an older model but you were told it was an 89. Only way to know would to call recreatives and give them your serial #. I'm not a two stroke guru but I don't think a remote air cleaner is a good idea. That G50B needs to BREATH. I know Don runs the UNI filters.

Mike

[jerseybigfoot]

You may want to retry the water test and have someone observe the clutch operation to see if the secondary is back shifts properly. When you climb the hills does engine bog with a running start or starting from a stop before the hill and ease into the throttle help keep the revs up?

[hydromike]

I don't think the air filter has a great deal to do with the problem. The original RIMs (e.g. MaxIV with a G50B) used a remote canister-style airfilter with a nearly 1.5' hose connected to the carburetor. I ran mine that way for a while, and never had issue. Of course, if you air filter is *restricted*, that could eventually limit performance. If it planes out nicely on the flat, I don't think it's the air/fuel delivery. Take a close look at the clutches....

~m

[mgc1953]

Thanks for all the response -- I know for sure it an 89 -- called RI when I first got it. Haven't had a chance to try it without the air cleaner yet, I think I can get a Unifilter locally. don't think(at least hope) it's the crank seals, the engine was barely warm and ran full throttle great for quite a while without load. Just have the single seat so I'll have to bungee my wife to the roll bar to watch the clutches! -- I'll keep you posted.