kendelrk
redneck engineer
landuse what size sprocket are you using on your rear tire?
Motorbike forks for a minibike
- Thread starter landuse
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r97
Measure twice cut once
OK....so I got the bike back from the small engine repair shop (I had taken it to them to sort the engine out that wasn't starting again), and then got it back on Saturday. It sort of ran for a few minutes and then didn't want to start again
The guy at the shop had told me that the 2 pick-ups on the carb had gotten some rust in them, and they had cleaned them out. He said it might happen again, and that they couldn't clean the tank properly.
I decide to take the carb off again, clean it and do some reverse electrolysis on the tank. As I am taking the carb off, I notice that the 2 bolts that connect the carb to the engine block are loose!!!. The whole carb can wiggle back and forth!! I then notice that they have replaced the one bolt with another one that has a smaller diameter and a totally different thread!! I can’t believe that these people who are supposed to be the best would stiff me like this!!
They had wanted the whole bike to test the engine under load, but they would have had to remove the engine to work on the carb cos there is not enough space in the frame to do it while it is in. Obviously they didn't do that. I am now going to go over there over lunch and see what they have to say for themselves.
The gas tank is still undergoing reverse electrolysis in my garage. It has been going since Saturday, and there is a whole lot of rusty rubbish frothing out the tank. I guess it is working
.
I will keep you al updated.
The guy at the shop had told me that the 2 pick-ups on the carb had gotten some rust in them, and they had cleaned them out. He said it might happen again, and that they couldn't clean the tank properly.
I decide to take the carb off again, clean it and do some reverse electrolysis on the tank. As I am taking the carb off, I notice that the 2 bolts that connect the carb to the engine block are loose!!!. The whole carb can wiggle back and forth!! I then notice that they have replaced the one bolt with another one that has a smaller diameter and a totally different thread!! I can’t believe that these people who are supposed to be the best would stiff me like this!!
They had wanted the whole bike to test the engine under load, but they would have had to remove the engine to work on the carb cos there is not enough space in the frame to do it while it is in. Obviously they didn't do that. I am now going to go over there over lunch and see what they have to say for themselves.
The gas tank is still undergoing reverse electrolysis in my garage. It has been going since Saturday, and there is a whole lot of rusty rubbish frothing out the tank. I guess it is working
.I will keep you al updated.
HellSpawn
New member
OK....so I got the bike back from the small engine repair shop (I had taken it to them to sort the engine out that wasn't starting again), and then got it back on Saturday. It sort of ran for a few minutes and then didn't want to start again
The guy at the shop had told me that the 2 pick-ups on the carb had gotten some rust in them, and they had cleaned them out. He said it might happen again, and that they couldn't clean the tank properly.
I decide to take the carb off again, clean it and do some reverse electrolysis on the tank. As I am taking the carb off, I notice that the 2 bolts that connect the carb to the engine block are loose!!!. The whole carb can wiggle back and forth!! I then notice that they have replaced the one bolt with another one that has a smaller diameter and a totally different thread!! I can’t believe that these people who are supposed to be the best would stiff me like this!!
They had wanted the whole bike to test the engine under load, but they would have had to remove the engine to work on the carb cos there is not enough space in the frame to do it while it is in. Obviously they didn't do that. I am now going to go over there over lunch and see what they have to say for themselves.
The gas tank is still undergoing reverse electrolysis in my garage. It has been going since Saturday, and there is a whole lot of rusty rubbish frothing out the tank. I guess it is working
I will keep you al updated.
Exactly why DIY is blatantly the way to go. Bummer to see you get f'd over like that though. You'll have this thing purrin' in no-time Im sure though.
Leftythenub
Computer Dork
Get an in-line fuel filter and you won't have that problem again. I wasn't using one on my brand new engine and managed to clog up my main jet in my carb. I ordered an in-line fuel filter and haven't had a problem since. My tank is also old and little rusty(haven't gotten around to cleaning it). Good luck.
Lefty
Lefty
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Thanks Lefty. I will have a look into that. Today I went to the engine repair shop, and demanded that they give me the correct bolt for my carm back. They eventually found one for me, apologising profusely.
Yesterday I unhooked the tank from the battery charger and washed it all out. It seems to be all squeeky clean and rust free at the moment. This reverse electrolysis works really well. I recommend it if anyone ever has rusty metal they need sorted out.
This evening I put it all back together, but it was getting a bit late so I will try start it tomorrow after work.
Yesterday I unhooked the tank from the battery charger and washed it all out. It seems to be all squeeky clean and rust free at the moment. This reverse electrolysis works really well. I recommend it if anyone ever has rusty metal they need sorted out.
This evening I put it all back together, but it was getting a bit late so I will try start it tomorrow after work.
Just a small update....After putting everything back together I couldn't get it to start. I tried everything from starter fluid to pouring some gas in the plug hole. I eventually took it back to the repair shop, and they have gotten it going again. The Briggs agent is coming around to the repair shop tomorrow, and he is going to check the engine out as well. At least this is all for free.
I am going to tear everything down soon and paint it, but we just have to figure out a colour first. This weekend I will be away, so hopefully I will have the engine in again by early next week.
I am going to tear everything down soon and paint it, but we just have to figure out a colour first. This weekend I will be away, so hopefully I will have the engine in again by early next week.
Well......I get the engine back tomorrow, so hopefully everything will work out OK when I put the engine in this time. I will keep you all posted
Sorry for the delay in updating this thread. I got the engine back and put it back in the frame. I haven't had a problem with it again now. It is going rreally well.
The only problem now is my gearing. I have decided to gear it even lower that what it is now. I have a 8.16:1 ratio at the moment. I am going to replace the 48 tooth rear wheel sprocket with a 57 tooth, and the 14 tooth J/S out sprocket with a 12 tooth. I am having keyways etc cut into them as we speak. I should hopefully get them back in a couple of days. This will push my ratio to 11.28:1. This should sort out all the torque issues that I am having at the moment.
I have also decided to paint the bike with Hammerite dark blue 'hammered look' paint. I know it is tricky, and sticky, to paint with Hammerite, but it looks so cool.
Oh...I also re-routed the throttle cable and it works much better now
The only problem now is my gearing. I have decided to gear it even lower that what it is now. I have a 8.16:1 ratio at the moment. I am going to replace the 48 tooth rear wheel sprocket with a 57 tooth, and the 14 tooth J/S out sprocket with a 12 tooth. I am having keyways etc cut into them as we speak. I should hopefully get them back in a couple of days. This will push my ratio to 11.28:1. This should sort out all the torque issues that I am having at the moment.
I have also decided to paint the bike with Hammerite dark blue 'hammered look' paint. I know it is tricky, and sticky, to paint with Hammerite, but it looks so cool.
Oh...I also re-routed the throttle cable and it works much better now
So this weekend I got busy with painting my bike. On Saturday I stripped the frame and got all the metal ready for painting. I had decided to use Hammerite hammered paint, so it didn't matter if I had a primer or not. Rust was also not too much of a problem, but I tried to get as much off as I could.
I used a flap disc for the first time to take the excess paint off the original bike frame. It worked like a charm. I used a 40 grit sandpaper disc. I can recommend them to anyone.
I then gave the frame a good wash with engine cleaner to get all the dirt and grease off it. It had a lot of chain lubricant on it which had to come off.
The instructions for Hammerite require you to wait 6 hours before you do a second coat, but not wait any longer. I assume it is something to do with the curing process. On Sunday I therefor woke up at 5:00 and went out to the garage to start the painting. We had other things to do during the day, so I had to start early.
Painting using Hammerite was not too hard. You just have to watch out for runs. Using a brush is perfect, because the brush stroke even out into a really nice finish.
I then gave the bike a second coat at around lunch time.
All that the bike needs now is some new sprockets (which I am waiting for), and for me to put everything back together again. Otherwise it is done!!
What do you all think of the colour??
I used a flap disc for the first time to take the excess paint off the original bike frame. It worked like a charm. I used a 40 grit sandpaper disc. I can recommend them to anyone.
I then gave the frame a good wash with engine cleaner to get all the dirt and grease off it. It had a lot of chain lubricant on it which had to come off.
The instructions for Hammerite require you to wait 6 hours before you do a second coat, but not wait any longer. I assume it is something to do with the curing process. On Sunday I therefor woke up at 5:00 and went out to the garage to start the painting. We had other things to do during the day, so I had to start early.
Painting using Hammerite was not too hard. You just have to watch out for runs. Using a brush is perfect, because the brush stroke even out into a really nice finish.
I then gave the bike a second coat at around lunch time.
All that the bike needs now is some new sprockets (which I am waiting for), and for me to put everything back together again. Otherwise it is done!!
What do you all think of the colour??
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fowler
New member
ha great colour
chris_the_poser
Member
I wanna start off by saying great build so far can't wit to see it finished, but i had a question for you. Did you take the current videos with the 1:1 ratio or the 8.14:1 ratio because if it was the 1:1 that would explain a lot of things. My little two horse Briggs minibike was geared 5:1 with 8in tall tires and was clocked at 35mph with the gps. it didn't have much for low end torque but I knew that was due to gear ratios. I swapped my 5.5 clone on it with the same gear ratio and now has plenty of torque to put you on your but.
Hi Chris. Thanks. The vids I did had the 8.14:1 ratio. When I basically had a 1:1 I couldn't even get moving. I think my problem is mainly the larger tyres. I have regular 12inch pit bike wheels, so they aren't small.
At the moment I am just waiting to get a larger sprocket for the back wheel (57 tooth), and a smaller sprocket for the jackshaft 'out' (12 tooth). That will then give me a ratio of 11.28:1. I should have plenty of torque then.
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chris_the_poser
Member
Ok just had to make sure. I hope you get the desired speed out of your new ratio. With gearing that low I would sure hope so.
I am not too concerned about speed. I am really more interested in extra torque. I want to feel it when I open the throttle!!
chris_the_poser
Member
Torque is always more fun. It is always nice to do wheelies on demand. So when is the eta on your sprockets from the machine shop I wanna see this thing go with the new gears on it
I called them yesterday to see what was happening, and they say that they are so swamped with work that brings in more money than doing my sprockets, that I will have to wait a bit longer. They are also fixing an axel for another kart I got, and he is doing that in his spare time to keep the costs down. I am also itching to see it finished. I am going to start reassembling the bike this weekend though.
I will just leave the back wheel off so that I can get the sprocket on when it comes. I will post some pics as I go.
I will just leave the back wheel off so that I can get the sprocket on when it comes. I will post some pics as I go.
I had a chance this weekend to work a bit on putting my bike back together. It looks really nice with the paint job! 
I have not attached the back wheel yet, as I am still waiting for a larger sprocket, and I don't want to have to take it all apart again to put it on, so the back wheel will be last.
I also decided to paint the jackshaft, and I think it looks pretty nice.
Here are some pics.....
I have not attached the back wheel yet, as I am still waiting for a larger sprocket, and I don't want to have to take it all apart again to put it on, so the back wheel will be last.
I also decided to paint the jackshaft, and I think it looks pretty nice.
Here are some pics.....
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kendelrk
redneck engineer
looks good landuse, what is that shade of blue? looks real good, and are you sure you want your seat up that high?
The paint is Hammerite hammered deep blue. The hammered look is really nice. The seat isnt that high, and is really comfortable. You get a really smooth ride. The bike forks help a lot
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