Still missing at 4-6K...

[HDKILA]

I tried the shims and it actually made the bike run worse once I installed the second shim. Lots of farting through the exhaust can throughout the rev range.

I also tried the bigger main jets (157.5) and it made my bike miss all over the upper rom 6-9K.

So what is next? I could try the 155 main jets as I am currently at 152.5???

What I am experiencing is strange...It only happens from 4-6 when lugging the bike. If I floor it through the gears it won't miss at all...only when lugging and when it hits 6K BAM she fly's like an eagle.

I'm 99% percent happy with the bike and wonder if I should even go after the small issue at this point but I am willing to try a few more things before I give up.

Ideas???:ummm:

 

[Rhoy Carter]

Have you checked the timing advance

 

[maleko89]

What was it like with one shim? How thick was the first shim?

 

[veebooster]

I know this sounds silly but....make sure your cover is on when testing with the Morley kit. If not it'll miss evrywhere!

Dale #2592

 

[veebooster]

Mains are on the small side. Friend up here had stage 7 needles and Hindle. He was using 162.5s if I remember right.

Dale #2592

 

[HDKILA]

What was it like with one shim? How thick was the first shim?

Mark, runs best with no shims. Not sure on the thickness...there were from Morley so I bet he would know.

 

[HDKILA]

Mains are on the small side. Friend up here had stage 7 needles and Hindle. He was using 162.5s if I remember right.

Dale #2592

I tried bigger mains and it started missing up top...:ummm:

 

[maleko89]

Are they as thick as the washer underneath the needle spring?

 

[HDKILA]

Are they as thick as the washer underneath the needle spring?

I would say about that thick...what about my stage 7 springs? Do you think it would help if I put the stockers back on?

 

[ace16a]

That's the exact same problem I'm having. Low and mid range were good with no shim and 155 main's. Upper (6K+) poped and no power. Went to 160 mains and mid started to pop and upper was still bad. Adding a shim didn't make a difference. You guys still think it's too lean?

 

[maleko89]

That's too thick. It went from too lean to way too rich.

 

[ace16a]

So go back to no shim and smaller main?

 

[maleko89]

Ace, sorry...I was replying to what Abe posted.

 

[maleko89]

That's the exact same problem I'm having. Low and mid range were good with no shim and 155 main's. Upper (6K+) poped and no power. Went to 160 mains and mid started to pop and upper was still bad. Adding a shim didn't make a difference. You guys still think it's too lean?

Sounds like you are lean. With my Mark's 4-2 with stock needles I had shimmed the needles 1.25 clips AND ran Mikuni 165's. Otherwise, it would cutout at 6000 before recovering at 7-7500 rpms. Currently, I'm running stage 7 needles on 2nd leanest clip with Mikuni 155's.

 

[maleko89]

FYI, 1 clip is .024 inches or 3/125. Using a standard washer is just too much of an adjustment. Little changes make all the difference.

 

[ace16a]

Sounds like you are lean. With my Mark's 4-2 with stock needles I had shimmed the needles 1.25 clips AND ran Mikuni 165's. Otherwise, it would cutout at 6000 before recovering at 7-7500 rpms. Currently, I'm running stage 7 needles on 2nd leanest clip with Mikuni 155's.

How did you shim 1.25 clips with the stock needles? Did you just take the spring out?

 

[maleko89]

With these. I combined the 1/2 and 3/4 shims.

http://home.comcast.net/~onlyone12/carbs1.htm

 

[ace16a]

Mark-You were right, I was too lean. Put 162.5 mains in and two of Morley's shims under the needles and it runs almost perfect. I didn't even sync the carbs yet. I'm at a slightly higher altitude than you so I guess thats why I didn't have to go to a 165. I'm going to leave it where it is for now and do some plug chops before changing anything. Thanks

 

[veebooster]

Guys, I'm telling ya if you're breaking up at 6000....then recovering at round 7500 rpm = bigger main. if you're using stock needles you should be bigger than the 160s.
If the stage 7 needles different ball game < 160s. (unless your at high altitude.)
Be patient......you'll get it. Minor change at a time.:eusa_dance:

Dale #2592

 

[maleko89]

Great!