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Post by RyanWiltshire on Jun 6, 2023 14:04:08 GMT -5
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Post by oldgeek on Jun 6, 2023 19:06:56 GMT -5
Snap a picture of the cylinder head itself, is it a stepped head that fits down in the cylinder?
Why did you pull it apart? Cylinder and piston look to be in decent condition, but looks like the ring end gap may not have been centered on the pin in the piston. There is kind of a weird mark on the cylinder wall.
Edit: At second look that weird mark is just likely blow by at the ring gap. Single ring piston?
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Post by Zino on Jun 6, 2023 19:38:43 GMT -5
step cut head
your cylinder head is designed to sit down in the cylinder ..
piston wash
good news the wash on your piston says you have been running on the real rich side.
that is dark in the middle and 30 % or more silver around the edges .
close to perfect would be less silver and mostly around the transfers
how it happens the incoming fuel from the transfers washes the black off and cools the top of the piston .
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Post by RyanWiltshire on Jun 7, 2023 3:53:03 GMT -5
the whole build is fairly new. not even 50 miles. I cant seem to get it riding right. I really really wish I had a leak down test kit for a yamaha aerox or knew how to build one as I would love to know if I am losing air and or if it's just a bad set up.
I feel like it's either electrical (can always hear a loud hum/high pitch squeal coming from my temp gauge (possible issue with wiring that is tripping the electrics?
or it's an air leak
or I am doing something terribly wrong when setting the carb up. bike wont start now anyways. plug keeps getting soaking wet after kicking it
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Post by 190mech on Jun 7, 2023 3:57:53 GMT -5
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Post by RyanWiltshire on Jun 7, 2023 4:33:00 GMT -5
spark plug is getting wet when I kick it over, so would this mean the carb is fine? also, do you know anyone on this site what would build me a tester if I paid them for their time, plus postage and package? |
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Post by RyanWiltshire on Jun 7, 2023 4:36:43 GMT -5
Snap a picture of the cylinder head itself, is it a stepped head that fits down in the cylinder? Why did you pull it apart? Cylinder and piston look to be in decent condition, but looks like the ring end gap may not have been centered on the pin in the piston. There is kind of a weird mark on the cylinder wall. Edit: At second look that weird mark is just likely blow by at the ring gap. Single ring piston? yeah its a single ring piston. I will snap some pictures of the head later when I get down to my garage. the cylinder is a 2t stage6 mk2 racing 70cc minarelli |
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Post by oldgeek on Jun 7, 2023 5:22:23 GMT -5
the whole build is fairly new. not even 50 miles. I cant seem to get it riding right............... or I am doing something terribly wrong when setting the carb up. bike wont start now anyways. plug keeps getting soaking wet after kicking it Ill have to agree it is most likely your carb setup. Do you have a stock airbox? what is your setup? Tuning can be a nightmare especially if you are starting completely from scratch, new carb, new cylinder, new CVT components, pipe....... |
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Post by RyanWiltshire on Jun 7, 2023 6:02:49 GMT -5
the whole build is fairly new. not even 50 miles. I cant seem to get it riding right............... or I am doing something terribly wrong when setting the carb up. bike wont start now anyways. plug keeps getting soaking wet after kicking it Ill have to agree it is most likely your carb setup. Do you have a stock airbox? what is your setup? Tuning can be a nightmare especially if you are starting completely from scratch, new carb, new cylinder, new CVT components, pipe....... Just got it started, what is all this coming out the exhaust there is loads of coming out   also my carb is stage6 r/t 21mm and stage6 double foamed filter |
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Post by oldgeek on Jun 7, 2023 6:11:12 GMT -5
Excess gas and oil. As Vino pointed out by the looks of your piston you are fairly rich. You are going to have a tough time getting that flat slide carb tuned and the open air filter is not going to make it any easier, but you can do it.
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Post by RyanWiltshire on Jun 7, 2023 6:14:35 GMT -5
Excess gas and oil. As Vino pointed out by the looks of your piston you are fairly rich. You are going to have a tough time getting that flat slide carb tuned and the open air filter is not going to make it any easier, but you can do it. Just took the exhaust out and tipped it and loads of liquid come out, LOADS! I’m starting to regret changing from a vac tal to a manual, I think my bike is flooding when off |
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Post by oldgeek on Jun 7, 2023 6:24:42 GMT -5
Is that an old picture or is there a screw still missing at the intake? A leak there and you will never get it tuned.  |
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Post by RyanWiltshire on Jun 7, 2023 6:31:38 GMT -5
Is that an old picture or is there a screw still missing at the intake? A leak there and you will never get it tuned. That’s a whole for different bike/model I guess as that hole leads to no where . I’ve got 4 bolts   |
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Post by Zino on Jun 7, 2023 7:35:55 GMT -5
first rule of scootertuning fix one thing at a time so you can go back and trace your steps
your biggest problems are carb related (hard to start ,Fuel in exhaust,Washed piston)
fix that first.
your open tap has left a stream of fuel drip into your carb then over flow into your cylinder and then fill your exhaust .
this is causing you to be flooded and it takes a while to clear out this fule before you can start it
once its started it can keep up .
get her running and then ride it for a non stop for an hour and then remember to turn off the tap
then tune the carb for best performing jets start with the main then work the needle and then pilot jet.
the open filter you are running makes it harder to dial in your jets it can be done just more temparmental when you are riding in different tempatures and humidity outside .
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Post by RyanWiltshire on Jun 7, 2023 9:20:14 GMT -5
first rule of scootertuning fix one thing at a time so you can go back and trace your steps your biggest problems are carb related (hard to start ,Fuel in exhaust,Washed piston) fix that first. your open tap has left a stream of fuel drip into your carb then over flow into your cylinder and then fill your exhaust . this is causing you to be flooded and it takes a while to clear out this fule before you can start it once its started it can keep up . get her running and then ride it for a non stop for an hour and then remember to turn off the tap then tune the carb for best performing jets start with the main then work the needle and then pilot jet. the open filter you are running makes it harder to dial in your jets it can be done just more temparmental when you are riding in different tempatures and humidity outside . I made a video of me riding the bike. It’s spluttering and chuggging like crazy until it gets either passed the needle/pilot, then on to the main it’s fine, I do notice a small splutter on the main when the bikes warmed up! Question is, I’ve dropped down a pilot so I’m thinking up going up a pilot again? Anyone suggest anything like needle height changes? From the video what is your opinion on it? youtu.be/VX7s4jdZol8 |
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