Yerf Dog Scout Issues

[corylee03]

Most torque converters, once into the higher gear range tend to limit peak rpm due to the load placed on the engine. My experiences are with modified ungoverned engines running aftermarket cams. But unless your engine is at its all out max rpm with the stock converter setup, the same will hold true. Any engine will make more power at a higher rpm, up until you reach the limits of it's valve train and cam. If you weren't already there, there is more to be had by letting it rev higher before it starts to work. Do you know how to drive a stick shift car? Dump the clutch at 1500 rpm. Now dump the clutch at 3500 rpm. You're giving the engine the opportunity to live in a higher ( more powerful ) rpm range. I wasn't assuming you had multiple sets of springs laying around. But if there is a selection of stiffer ones for sale, you can customize your setup to your own liking. The spring sets for the common 30 series are dirt cheap. Like $10 a set.
I probably have 10 sets in my spare parts box.

Ahhh makes more sense now. Especially with the ungoverned point. I am def not an engine builder but i do have a fairly good understanding of engines. I grew up (and currently live) on a farm and we have always had to work on something or another but never anything with a CVT. I appreciate the explanation and i definitely think i will be going with a little lighter weights. O and yes the slider weights are about $10 as well in all different weights.

 

[corylee03]

Alright so finally got around to working on the little scout some more. Wife is fully moved into her new building for the business so that allowed me to purchase some more parts to play with.

We went ahead and ordered a new clutch and also a new set of slide weights. We went with 10g weights. Had to pull the whole swing arm off the back to get to everything easily. Installation wasnt terrible, but in the process of taking it apart, we found that one of the rear shocks was broken. Sooo we ordered a set of shocks to go under the rear as well. We also ordered a chain tensioner and a new chain. We also had a brake cable break on us and ordered a new one.

We put everything back together and had to make a couple little adjustments here and there. Once we finally pulled it out of the shop, i found that the engine was still bogging down in the mid and high rpm range. It would just choke itself out. This was after i had quite the time trying to set the carb so it would run through the entire rpm range when in neutral in the shop. I made a TON of adjustments on the carb trying to get it dialed in but nothing seemed to be working. Decided that maybe we picked up trash somehow in the carb so my son and i decided to pull it all apart and clean it up good. It was clean as a whistle. Before i ever got this buggy, it had a brand new carb bought and installed on it.

We also had the chain bind and bend the new chain tensioner. After inspection, it seams that the plate and bearing that support the shaft out of the transmission has had more……home engineering applied to it. I have ordered a new plate and bearing to replace the welded and cobbled mess that was on it. Hopefully this should align everything a little better and we can straighten out the chain tensioner and solve all of these problems.

Back to the bogging down issue. After a while of beating my head against things, i finally had the bright idea of checking the jets in the old carb. Cleaned it up and there is a massive different in the main jet. The main jet in the new carb is 102.5 and the old carb had a 125.5 jet if i remember correctly. I cleaned the main jet from the old carb and installed it on the new carb and am not waiting for a new intake seal to ensure that im not having some type of issue there. It looked a little suspect when i checked it and they are super cheap so i just went ahead and pulled the trigger.

Hopefully all of these things should remedy the remaining issues and we can finally see what this thing is going to do! I’ll post an update as i get it. If anyone knows the stock jetting on these, i am all ears!

 

[corylee03]

 

[corylee03]

This pic shows the nice welding job but not this severe misalignment that you can see from the other side. Tensioner is removed in the pic

 

[borderlyne]

Alright, finally some more progress. I called the place i bought the harness from to see if I could get a wiring diagram of the harness they sent me. Unfortunately, they get them from China and they did not have one. Also they didnt know when they would get the front half of the wiring harness. So we decided to start doing a pin out on everything to see if we could figure out what was going on.

Apparently the New wiring harness has and extra connector on it that was meant for tail lights which the scout does not have. When connecting things, this had gotten connected to the stator wires. We corrected this correctly and the ignition switch problem is no longer a problem. It is functioning as it should.

We still didnt have spark at this time. We would get a single spark the moment the key went from off to run, but never any spark while it was in the starting position. We continued to pin everything out and then found that there was an extra wire to the CDI box (we checked it originally with the old harness and it was there) that provided a constant 12v to the pin that is suppose to be empty. Once we removed this wire from the connector, we had a strong spark and it immediately fired up! *** oh yea we checked the gap for the pick up coil while we were at it and it all checked out fine as well.

It was smoking some ( and i figure a little to be normal from sitting) at first start up. Much more than i had anticipated. We then cracked open the valve cover and went ahead and checked the gaps. The exhaust was tight so we reset it and put the cover back on. That fixed the smoking issue.

We still have to replace the choke cable on the carb and i believe the carb will need some adjusting. However, we were able to get it out and go riding today. It is def not a powerhouse by any means but we could consistently ride at 15mph without any issue. Any faster and it would start to surge a little. Im sure this is the carb needing adjusting and the choke fixed. It was also rattling very loudly at the top end of the RPMs. Im assuming it is most likely the homeade tensioning system for the chain. Either way, the kids are both excited and really enjoyed driving it and it already beats walking.

I know this post is over a year old, but I'm having same spark issue. When you said there was an extra wire going to the cdi that was supposed to be empty, do you happen to remember which wire it was, and where it was connected? You said you removed it, and it immediately fired up.

 

[Whitetrashrocker]

Not sure corylee will be back to answer your question there borderlyne.
You'll be better off starting a new thread in the right dept.
List all the things you have done or tried. And pics really do help.

 

[Hellion]

Not sure corylee will be back to answer your question there borderlyne.
You'll be better off starting a new thread in the right dept.
List all the things you have done or tried. And pics really do help.

He's right borderlyne, and more often than not nothing will happen but it is better than nothing.
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[Whitetrashrocker]

Ive turned all those off for me. They work in that regards. Just notification if I'm logged in.

 

[Timf1981]

I know this post is over a year old, but I'm having same spark issue. When you said there was an extra wire going to the cdi that was supposed to be empty, do you happen to remember which wire it was, and where it was connected? You said you removed it, and it immediately fired up.

Did you figure anything out?
Did you start a new thread. I am about to track down the same issue once I get a new stator.
Do you have the yellow Yerf-Dog rover?
I do. 38400

 

[Hellion]

Did you figure anything out?
Did you start a new thread. I am about to track down the same issue once I get a new stator.
Do you have the yellow Yerf-Dog rover?
I do. 38400

1. Borderlyne is a one-post-wonder
2. Same as above
3. Unknown. Would assume he has a Scout same as the OP, but that is assuming

Rover looks very similar to the Scout.

I would start a conversation (private message) with corylee03. If he logs in again or has notifications turned on, he will see it. Provide as much information as you can, etc., etc. Click the below link, then click Start Conversation.

corylee03