2015 - Project Rocket Kart #2

[rushking19]

Any luck?????

No sorry haven't been able to work on it lately or start it to post a video, because it's been raining all week and there's supposed to be this hurricane coming this weekend, so I'll have to wait till next week to try

 

[Desertduler]

No sorry haven't been able to work on it lately or start it to post a video, because it's been raining all week and there's supposed to be this hurricane coming this weekend, so I'll have to wait till next week to try

Hurricane? Holy Sh-t put your kart some where safe and take cover!!! and the best of luck to you!

 

[rushking19]

Hurricane? Holy Sh-t put your kart some where safe and take cover!!! and the best of luck to you!

Its just going to go up along the East Coast not going to be to bad just mostly raining all day

 

[Desertduler]

Its just going to go up along the East Coast not going to be to bad just mostly raining all day

You hope right? In all seriousness though I wish you the best of luck!

 

[rushking19]

You hope right? In all seriousness though I wish you the best of luck!

Ok thanks

 

[rushking19]

Ok today was decent enough to start the snowmobile engine, so it runs slightly better,i was just thinking maybe I have the idle screw to turnt down, because I'm not sure what rpm it should idle at, but that may be it I'm trying to idle it at a to low of an rpm but I'll see later, and the rpms rised up because it had ran out of gas all the gas went to the red gas can, because the return fuel line.still probly needs a little bit
https://m.youtube.com/watch?v=iIhMQ9-zrQA

 

[DirtyDamage]

You need an exhaust. Especially with a two stroke...

 

[rushking19]

You need an exhaust. Especially with a two stroke...

Yeah I know im going death I have to take it to a muffler shop to get a header made for it and I have a rlv muffler I want to put on the end of it, the muffler in the pictures

 

[rocketkart]

your going to crack a ring runing it like that with no exhaust.

 

[rushking19]

your going to crack a ring runing it like that with no exhaust.

I know it's just till I get a header I'm just starting it so I could fix the idling problem

 

[Desertduler]

You need to run the engine long enough to get completely warmed up and rev the engine up to vacate the excessive fuel that is puddled in the crankcases out of the engine so then you can properly set the air fuel mixture screws both high and low, that engine is loaded up with fuel and is "blubbering" or "four stroking" when the throttle is opened up, it would be best to be able to put the engine under a load to get it to clean out and then set the carburetor mixture screws, you will not crack a piston ring running your engine with those short exhaust pipes on the engine that is not true! but I would make an exhaust system similar in design of a two cylinder snowmobile exhaust not like a four stroke exhaust system two stroke engines are very sensitive to exhaust design and a four stroke exhaust is the complete wrong design for a two cycle engine.

 

[DirtyDamage]

I wouldn't even chance it personally

 

[Desertduler]

Over the 40 plus years of being an engine mechanic I have never seen a broken piston ring related to running an open exhaust, that statement does not even make any sense.

 

[rushking19]

You need to run the engine long enough to get completely warmed up and rev the engine up to vacate the excessive fuel that is puddled in the crankcases out of the engine so then you can properly set the air fuel mixture screws both high and low, that engine is loaded up with fuel and is "blubbering" or "four stroking" when the throttle is opened up, it would be best to be able to put the engine under a load to get it to clean out and then set the carburetor mixture screws, you will not crack a piston ring running your engine with those short exhaust pipes on the engine that is not true! but I would make an exhaust system similar in design of a two cylinder snowmobile exhaust not like a four stroke exhaust system two stroke engines are very sensitive to exhaust design and a four stroke exhaust is the complete wrong design for a two cycle engine.

I know but it didn't original come with an expansion chamber not even when it was on the snowmobile,it had a can style muffler, so u don't think my custom exhaust should effect it to much

 

[Desertduler]

I know but it didn't original come with an expansion chamber not even when it was on the snowmobile,it had a can style muffler, so u don't think my custom exhaust should effect it to much

Having worked on many snowmobiles I know about the "can type" that you are talking about and that type would be better to use than what you are intending to use, you could use a "Y" type header and lead it to a larger chambered muffler and that would be a better choice, look at some vintage snowmobile mufflers on ebay that were used with two cylinder two strokes close to your engines 399cc displacement to get some what of an idea of what you might be able to use.

 

[rushking19]

Having worked on many snowmobiles I know about the "can type" that you are talking about and that type would be better to use than what you are intending to use, you could use a "Y" type header and lead it to a larger chambered muffler and that would be a better choice, look at some vintage snowmobile mufflers on ebay that were used with two cylinder two strokes close to your engines 399cc displacement to get some what of an idea of what you might be able to use.

I will try to look but I chose this exhaust system because it was simple it's just a y pipe going into the rlv muffler, and can fit in the very little space I have behind the seat, and because I already have it and don't have to spend anymore money to get an expansion chamber and fit it behind the seat.and plus I looked before with no luck,and I just want to see how this setup will work and sound. I can always upgrade later if I want

 

[Desertduler]

I will try to look but I chose this exhaust system because it was simple it's just a y pipe going into the rlv muffler, and can fit in the very little space I have behind the seat, and because I already have it and don't have to spend anymore money to get an expansion chamber and fit it behind the seat.and plus I looked before with no luck,and I just want to see how this setup will work and sound. I can always upgrade later if I want

It is your machine do what you want, I am just trying to give you the best advice that I can from what I have learned over the years from first hand experience,the best of luck to you

 

[rushking19]

It is your machine do what you want, I am just trying to give you the best advice that I can from what I have learned over the years from first hand experience,the best of luck to you

Thanks for understanding

---------- Post added at 09:46 PM ---------- Previous post was at 09:17 PM ----------

My only worries is burning up the engine which I heard about, and also of it still being a little loud with this muffler but I think it should quit it down alot, because my Briggs and Stratton intek 6.5hp straight piped is just as loud at idle and high rpm

 

[rocketkart]

Over the 40 plus years of being an engine mechanic I have never seen a broken piston ring related to running an open exhaust, that statement does not even make any sense.

You may have not seen it but I have. Cold air will het them ring and crack them if not worp them. 20 yr aircraft mechanic. Father another 60 yrs. Seen it done on a rotex engine with only a 3" pipe and other engine as well. Dose that make any sense to you

 

[rushking19]

You may have not seen it but I have. Cold air will het them ring and crack them if not worp them. 20 yr aircraft mechanic. Father another 60 yrs. Seen it done on a rotex engine with only a 3" pipe and other engine as well. Dose that make any sense to you

It has to be a major air temperature different then like really cold outside and have to be ran for a very long time without a muffler I'm just trying to tune mine ima put a muffler on it soon