New here

[landuse]

The average age of members on this forum is below the age of 20. To believe that youngsters are going to hold back on going full throttle is not reasonable. The reason why we advocate a billet rod with stronger springs, is because it is a proven fact that rods can blow through the block if you are not careful. Why waste an engine, or have potential injury? Members who have been on this forum for a while are more interested in safety than trying not to hurt peoples feelings.

The fact that you have not thrown a rod does not mean that it is not possible, and more likely to happen if you keep the stock rod. I am not going to take that chance with my kids, or advise anyone else to do it.

 

[Quad-tor32]

Wow didn't think I would get such a argument going with just a post lol, so why you guys are saying is a bigger rear sprocket should fix the issue? I am wanting to go with a torque converter anyways since I will be doing a lot of stopping and going around the pits at the track, my only problem now it I have looked up sprockets and with this being a Chinese off brand atv rear end where do I go to get a sprocket for it? What size should I look for? Thanks guys, and the gearing makes sense because when the predator flattened out at full throttle at 3600 rpm I was spun about 35 mph, it took forever to get their but when I did it was stupid fast for how low the engine was running

---------- Post added at 08:00 AM ---------- Previous post was at 07:17 AM ----------

Btw I think the weight of it is around 125-140 lbs plus a 160 rider (me)

 

[landuse]

You should be able to get sprockets anywhere. Just make sure you know what the sprocket pitch is. You can measure the distance between teeth to figure out what it is. Half an inch is usually a #40 chain. Post the distance here though and we can tell you

 

[Poboy kartman]

If I needed to govrn an engine I would adjust the govnr instead of using valve float as my govrnr. You can bend back the armature, trim the width down so it doesn't catch as much air, adjust the linkage, swap springs, etc to increase the rpm of the govnr without using valve float.

I guess I just have a different way of doing things then everyone else? I learned most of what I know from my father who used to race go karts, outlaw modifieds, dragsters and motorcycles, was a certified master mechanic for over 30years, built high performance motors for everything that he raced and was a marine mechanic specializing in high performance dyno tuning of outboard bassboats for pro anglers, to which he was also a factory sponsored pro angler for 18yrs. I guess I grew up with a different was of reasoning, thinking and driving. Right or wrong, I can atleast accept it.

Why use valve float to govern an engine when you can adjust the govnr AND youdecided to eliminate the govnr completely? Such nonsense.

You are just full of good advice. Small engines aren't motorcycles, race cars, or crankbaits....and different rules apply.

What you just suggested is Cardinal rule #1: "Do not adjust the governor, either completely remove the internals, or leave it alone! "

Remember, these are Chinese engines and we know their weak points and the governor internals are the ABSOLUTE weakest point on these engines.

Stick around and learn.

 

[ChromeRhino]

So you act like this any time someone mentions adjusting a governor withought doing a full rebuild of stock internals or questions one of your religious-type Chinese engine rules? Wow.

A gas internal combustion engine works the same whether its a Chinese 6.5hp motor or 3,000hp v8. The rules are the same, its the limitations that differ. I also noticed that you left out that he raced go-karts. Convenient, and not surprising.

As far as crankbait is concerned, I think it would have more relevance describing your personality than proving your point.

 

[bob58o]

Get a rod

 

[ChromeRhino]

Wow didn't think I would get such a argument going with just a post lol, so why you guys are saying is a bigger rear sprocket should fix the issue? I am wanting to go with a torque converter anyways since I will be doing a lot of stopping and going around the pits at the track, my only problem now it I have looked up sprockets and with this being a Chinese off brand atv rear end where do I go to get a sprocket for it? What size should I look for? Thanks guys, and the gearing makes sense because when the predator flattened out at full throttle at 3600 rpm I was spun about 35 mph, it took forever to get their but when I did it was stupid fast for how low the engine was running

---------- Post added at 08:00 AM ---------- Previous post was at 07:17 AM ----------

Btw I think the weight of it is around 125-140 lbs plus a 160 rider (me)

Lol its not your fault. I wasn't aware that the solution to busting a rod with that engine was to allow valve float. I guess its better than tossing a rod though lol I didn't think it would start such an argument and take over your thread.

Well anyhow, Sweet build. Looks great. Good luck to ya

Oh... and LEAVE THE STOCK VALVE SPRINGS IN THERE OR YOU WILL THROW A ROD!

 

[Quad-tor32]

I don't plan on twisting or snapping the connecting rod as I'll have a tach on it and will limit the throttle to only turn around 5500 Rpms, now I just gotta find a different rear sprocket, install a Tc and make sure it's good to go then tear it all back down and make it look good and re assble or so it's ready for this fall

 

[Jrgunn5150]

Quad-tor, you need a larger rear sprocket to effectively gear your lawn mower monster thing lower.

 

[bob58o]

Quad-tor, you need a larger rear sprocket to effectively gear your lawn mower monster thing lower.

Drunk vacation bob says 7.5 : 1 with big tyres, but maybe can get away with 6:1

 

[Jrgunn5150]

Drunk vacation bob says 7.5 : 1 with big tyres, but maybe can get away with 6:1

Sober work J.R. agrees lol.

 

[Quad-tor32]

Looking to get a tav with a 10t sprocket, I found a 60t rear sprocket and also a 50t rear sprocket, rear tires are 16-8-7 off of a youth quad, I'm not really sure what this thing is but it will get me around in the pits tbthe racetrack, going with a larger rear sprocket I now will have to modify the rear mounts toclearnthe larger sprocket, so while I'm doing that I'll et parts ordered so when they get here I can assemble it, so what do you think a 50t or a 60t rear sprocket?

 

[Denny]

I'm just throwing this out there please don't kill me anyone. But I have never heard of one of these motors dropping a valve, infact it seems the only pretty indestructible part of these engines is the valve train. But I could be wrong. Seen a few rods go through blocks though. As far as the OP's problems go I would add a tav2 kit with a 10 tooth drive sprocket and a 60 tooth driven #40 chain.

Denny

 

[Jrgunn5150]

Looking to get a tav with a 10t sprocket, I found a 60t rear sprocket and also a 50t rear sprocket, rear tires are 16-8-7 off of a youth quad, I'm not really sure what this thing is but it will get me around in the pits tbthe racetrack, going with a larger rear sprocket I now will have to modify the rear mounts toclearnthe larger sprocket, so while I'm doing that I'll et parts ordered so when they get here I can assemble it, so what do you think a 50t or a 60t rear sprocket?

I would do the 60.

 

[ChromeRhino]

I'm just throwing this out there please don't kill me anyone. But I have never heard of one of these motors dropping a valve, infact it seems the only pretty indestructible part of these engines is the valve train. But I could be wrong. Seen a few rods go through blocks though. As far as the OP's problems go I would add a tav2 kit with a 10 tooth drive sprocket and a 60 tooth driven #40 chain.

Denny

Yup, I havent seen or heard of a valve dropping either, Bud. In fact, I have never seen any of those motors have any problems at all except for floating the valves and whatever wear and tear it does because of floating the valves. While its obvious that they aren't indestructible, they have proven to be a geat value for $100, if driven and used responsibly. I have heard the rods are the weak link from others and in my research also, so I'm not arguing that point at all. I sincerely doubt you and everyone are wrong about that.

Thanks for the polite and enlightening prospective, personal testimony and candor, Denny.

 

[landuse]

I haven't really heard of valves dropping either

 

[Poboy kartman]

I haven't really heard of valves dropping either

I did it once, but I had oil on my fingers.

 

[ezcome-ezgo]

I vote we thank Denny for his sound advice and remove him from the "To Kill" list.

 

[landuse]

I vote we thank Denny for his sound advice and remove him from the "To Kill" list.

We have a "To Kill" list??

 

[ChromeRhino]

I did it once, but I had oil on my fingers.

Lol nice.

---------- Post added at 09:10 AM ---------- Previous post was at 09:04 AM ----------

I vote we thank Denny for his sound advice and remove him from the "To Kill" list.

I second the motion. If we can get a third and a senior member we can carry the motion and put Denny on the fast track out of Anxietyville.