81 1200 Project

[brianinpa]

Changed the coolant temp sensor with the one that was in the 1100 motor and now I know what the coolant temp is.

I then played with the acel pump as much as I can in either direction. Moving it to the maximum in the counter-clockwise position, the bike runs the best, but there is still a little bit of break-up, so I need to work with the main jet a little.

I am beginning to ride it further and further and even making numerous stops with it, so my confidence in it is building.

 

[slabghost]

Sounds like you are making great progress now. It won't be long now you'll have that carb dialed in.

 

[brianinpa]

If I knew there wasn't a little more there, I would quit now but I can feel it in the seat that there is just a little bit more there.

 

[joedrum]

that dose sound great brian ....

 

[fivestring]

I agree, from your description, there is some power yet to be had on that top end. Mine pulls hard till I let up on it.

 

[dan filipi]

Sounds great!

 

[brianinpa]

I pulled the main jet out, drilled it to approximately 1.40mm or a 140 and quickly found that it was too much. I started the bike and it idled fine but as soon as tried to pull out, the bike fell on itself.

Soldering brass must be an art form that I haven't mastered yet because I cannot seem to get any solder on that jet no matter how hard I try. As soon as I think it is good, the solder falls off. More attempts tonight.

Oh in case it helps someone in the future, here is a jet size, MM, Inch, drill bit size chart I found while searching for one...

View attachment JetSizes.pdf

 

[dan filipi]

The jet is dirty or not using enough heat or heat in the right place for the metal to melt the solder.
I use a dab of tinning flux to clean.

 

[slabghost]

Most pen type soldering irons will need quite a while to heat the brass enough for the solder to flow and bond. Any air flow will increase the amount of heat needed. As will holding the jet in a vise. Think heat sink.

 

[dan filipi]

I use a torch (not a flashlight) on low flame. It sort of is an art. Don't heat it too much but enough to melt the solder.

 

[brianinpa]

I was sure it was a heat issue because I could easily pick up the jet after soldering it which told me that it wasn't getting hot. I was going to move to the torch tonight. I also ordered a few extra jets last night just in case I cannot get it right.

 

[joedrum]

it be nice if jets were cheap and easy to buy so changing was all that was needed ......

 

[brianinpa]

Yeah... $10.00 each and wait a week for them to arrive is somewhat an issue. Gone are the days of going to the local auto parts store and actually finding the parts you really need are in stock.

 

[ekvh]

I set the jet on an appropriate sized drill bit to prevent the solder from filling the entire jet's cavity. Saves a lot of time drilling them out. It probably is worth using larger bits to chamfer the holes to replicate original jet. I use flux liberally first.

 

[brianinpa]

I broke down and bought a butane torch and now the jet is as close to a 130 as I can get it with my crappie drill bits. Once I get the Jets I ordered I'll change that one out but with the jet as it sits now and the Acel pump at half, the motor pulls like a train through the first three gears. In 4th and 5th, I still notice a little bit of break up.

I need to get the tach sorted out because it isn't working... I'm not sure if that is my tach, the wiring, or the signal from the C5. I also need to get my phone mounted to the handlebar so I can use my MPH app. When I am in 3rd and getting ready to shift to 4th, I am already doing 80, so the 85 MPH speedo is useless.

 

[dan filipi]

The pull with a single and C5 are impressive aren't they!? Amazed me really how nice the low rpm torque is especially.

 

[slabghost]

Sounds great Brian. Falling off in higher gears you might want to verify the choke is in fact wide open when fully warmed.

 

[brianinpa]

The choke on 34 Pict 3 is electric, and this one is non-operational. I have the kit to convert it to manual, but for now, I don't need it, so I am going to keep it as is... It is completely open.

 

[brianinpa]

Yeah, Dan it sure does put a smile on the face.

 

[fivestring]

I'm glad to hear you're making progress, Brian. I felt kinda bad when you drilled to 140 like I suggested and it didn't work for you.

It sounds like I need to investigate this c5 business...