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Discussion in 'Thumpers' started by Gregster, Jul 6, 2007.
If you are thinking big bore, the largest I know of without doing major mods and using still using original sleeve rebored is the Wiseco 102.4. I ran one in my XL for many miles and years with no problems. I ran it with stock cam and springs etc. It made a noticeable difference in power, with no changes in mannerisms. As they say, there is no substitute for cubic inches.
Hi. Im in the process of a rebuild on my '86 and have purchased a Wiseco 101 11:1 kit. With the higher compression i was wondering about the need to look at jetting to get the most out of it.
I live at sea level, temperature range about 5 - 30 deg C. The jetting I have is 108, 65 main carb and 105 in the other.
Any advise would be appreciated so I can do it while the beast is in bits!
If you dont change anything airflow-wise [ filter , airbox or exhaust ] your bike will run richer due to the increased compression.
Hey, we all started out ignorant. When I was born I knew nothing. Now at 67, I know even less!
And it's all down hill from here on.
I live near sea level too, but have much larger jets in my 87 XL. 125 primary carb, 118 secondary.
Bigger bore usually doesn't need drastically different jets, but yours sounds too lean to start with from my experiences.
Hmm, I'm a bit more conservative...I started off with nothing, after careful budgeting, I found that I still have most of it left
And higher compression will make a lean mixture more likely to ping.
Thanks all, for the replies I guess I will need to research the thread for some more on jetting . It sounds a bit of a mine field !!
I wanna rejet mine but I don't know anything about it. I'm pretty sure I can get more power out of this thing if i changed the jets
So basically I go WOT and shut the engine off and pull the plug for a reading?
Mine kinda looks like this when I check/change it once in a while
Anyone knows where I could find the white seal wich is installed on the edge of the fuel tank on a XL600 LM?
How about automotive door edge protector?
Car door edge trim at an autoparts store. They usually have it in black , chrome and clear.
I really hate to burst your bubble, but today's gas does not give accurate plug reads. It will show if it is sloppy rich and black and sooty, but otherwise not really at all. The best way of all is a wideband o2 sensor in the pipe. In lieu of that, start with a running combination that someone else has tried and fine tune from there if needed.
I have tried nealy every jet, slide, emulsion tube, carb synch combo I could dream of over the years. I have finally achieved a point where I think it is as good as I can get with limited parts. I find now that if I change something today, like needle clip position, I generally change it back tomorrow. That is a good sign that I am very close.
I did it all with the butt dyno method over several years, I would go months at a time with no change because it was really quit rideable but..... I guess I just can't leave well enough alone if I think I can get better.
I'd be more concerned about who's been shooting at your tank! :eek1
will xr footpegs work on an xl600r?
Thanks Dave I had the feeling the bike was not getting the gas so i think you're onto it with regards the jetting. I will take your advice and am going to try a 120, 118, 65 combo. Will let you know how it goes. Am still waiting for my conrod to arrive from partzilla
I have 4 other tanks in spare don't worry, I even have a brand new one, but the white seal is not installed on it...reason why I try to find it on the aftermarket, anyway if anyone of you guy's can check at the opportunity of a visit to an automotive part shop in the US, I would really appreciate, I have checked here in Thailand but so far for...no success.
I might try as well when I'll be back to Belgium for Easter vacation next April...but I haven't seen something like this for sale so far...:huh