A few mechanical questions

[Dennyz]

Ken is correct

[skids]

LOL! You know, I was wondering what the heck happened to the display. I thought I screwed up something because I deleted some cookies. I left the site, came back, and wallah...fixed. Thought there was a ghost in the machine!

Originally posted by Ken Talbot
Sorry about having to edit out a bunch of your ???? marks, Gaffer - that's what was causing the wide display problem.....

[gaffer77]

sorry i wondered myself what happened to it


feel real bad now!!! got to get some guages now!!

heard so many myths and things want that video

top cats on about so i know what is what i paid a shop

to do a cbx i had and i dont think they had a clue what they

were doing and just said theyd done it,i want to know for sure

its done and done right!!!!

[thumperjsa]

Did some playing around with my bike this weekend. All 4 cylinders were running lean. All were mostly white. So I opened the tops of the carbs and adjusted the needle to the rich position. I have not yet checked the color of the plugs since I did it. I did notice a lot more power when I did it.

I wanted to get back to my clutch question. I noticed a few issues. One is my clutch cable needs to be replaced because the cable is adjusted as far as it can and I can rev the engine in 1st with the clutch pulled all the way and I can feel the bike wanting to pull slightly forward. I also noticed the feel of slipping like a described earlier during high acceleration. The closest I can describe of this slip is a cahin drive bike slipping on a tooth. I get what feels like a momentary loss of power and then zoom. Since I made the engine more rich and tried adjusting the clutch, it wants to do this more.

About 6 months ago I had the clutch rebuilt by a shop. Unfortunately for me, since then the shop has been sold and moved. I have also had someone else look at it and they think the clutch may be slipping again and not knowing for sure what the bike did during the rebuild. Before the rebuild, the clutch was really bad. I don't feel comfortable enough trying to rebuild the clutch myself.

So based on this slipping feeling under high acceleration, the rolling forward in gear with the clutch lever pulled in, do you think it might be the clutch? I plan on replacing the cable but I don't think that will take care of it because of the accelaration issue.

[John]

On the carb issue, You should check the size of the main jet. By adjusting the needle height, all you've done is change when the full flow of fuel comes on. You really aren't getting any more fuel through the main jet. The needle just controls when you get full flow, not really how much, especially under hard acceleration. Try increasing the main jet size by one size. The run in increments of 2.5. ie 137.5, 140, 142.5...
The slippage you feel during hard acceleration...is it just in first and second gears? Could be the infamous first/second gear problem common to these bikes. Your last sentence almost seems like an oxymoron.

[thumperjsa]

Before I increase the mains, I will see if anything changing the needle jet did. Any good sources to by the mains at? I believe they are now 42.5 so I will need 45's.

As to the slipping, before the work done this past week, it was only effecting 1st gear. I did not have the opportunity to get on it in second because of the short drive home in traffic. I will try to get it on a more open road before I test second again.

[John]

142.5 main jets, and it still runs lean? What year are the carbs? What changes have you made to the intake and exhaust systems? For 80 carbs, those mains are huge. I have a set of 140's in my bike. I have a 1179 big bore kit, Uni foam filter in the stock air box, and a set of Jardine 4 into 2 pipes. My carbs are from a 78. I run at fairly high speeds on my daily commute, as it's mostly freeway, and it seems to be dialed in right were I have it. The carbs from an 80 model had much smaller mains, 115's in # 1 & 4, and 120's in #2 & 3. That was supposed to be for emissions and cooling I guess. The older bikes all had the same size jets in them. 137.5's

[thumperjsa]

Oops. My mistake. The carbs are 79. I quoted the pilot jets. The mains are 137.5. So I need 140 mains to go up a size.

The exhaust system is a 4-1. I bought the bike from the PO with 4-1s and I replaced them with new Mac 4-1s. I believe the mains should have been sized up going to a 4-1 to begin with if I recall. I have not done it yet.


Are the jets from Mikesxs page compatable with the 1100 and is that a good source for them?

[TopCatGr58]

Hey Thumper,

The Mikuni KN 100-604 series is what you're looking for, and Bike Bandit has them for $8.99 a set of four:
Bike Bandit Jets

I just looked at Mikes XS, yes, they are the right jets, the large head type!

As for clutch, if the clutch is slipping, it usually will show it in the higher gears, 4th and 5th, where there's more stress on the plates, more resistance in the drivetrain, and so at those higher speeds, when you put more throttle into it, the engine may rev higher, but the bike doesn't seem to go any faster!!!!

You need to do the adjustment on the side of the engine clutch cover first, then reset your handlebar adjustment. With it wanting to crawl, the clutch isn't disengaging enough.

The first gear symptom can be tested by gently holding down your foot on the gear shift lever while accelerating, if you don't get that surge symptom, then try it again without holding the lever, if you get it then, then your 1st gear is suspect! However, if your clutch cable is sticking, it may not be fully engaging at first when you let it out, and then as it releases more it stops slipping and fully grabs, and that could be it also!?!?

T.C.