FINISHED! 421 cheetah cub install...

[CBAIER1206]

Just finished installing my cheetah setup with the parts in my sig and went to kick start the bike today with my fingers crossed! It took me slightly pressing on the throttle to start it after a couple of kicks but it fired up and sounded sweet! I'm running 110 octane at a 20:1 fuel/oil ratio to break in the motor.

Anyways the motor would not idle and the right bank was barely working almost like it was running on 1 cylinder...my heart almost skipped a beat! My initial thought was that I missed something during the install and I was ready to do a compression test, but I started fiddling with the carbs first. I adjusted the cable so the carbs were synced and still the same result but got it too idle at least without me having to hold the throttle. At that point I noticed the slides in the carbs were different...the left one sat higher up at idle. Keep in mind all these parts are brand new including the carbs, so needless to say I adjusted the right carbs idle screw and probably had to turn it 5 turns to get it to match the left carb. Problem solved! Both banks now fired identically and I could feel an equal amount of heat in both pipes whereas before the left pipe would get hot and the right would be cool.

I found it crazy that the carbs were brand new and could be that different in their initial settings! I just wanted to share my experience in case someone else has a similar issue...however...

This bike rips! I have run out almost a full tank just letting it idle and doing some easy riding through the neighborhood trying to break it in properly but I got on it once in third gear as I could not resist and WOW! All those on the fence to get this setup, go for it!

[Hilarious]

congrats on your new engine.

Having your carburetors in perfect syncronization is key.

Is your cub ported or did you install it straight out of the box?

[CBAIER1206]

I did a clean up port on it and port matched the transfers to the engine case ans vice versa

[STINKYDELUXE]

fast sells the easyiest sync tool it takes about 2 min to get it perfect :thumbsup:

sounds like a great bike

[Animalman294]

Yes, the sync tool that Jeff has works great, and its really easy to get them dialed in.............

[shanYE west]

Yes, the sync tool that Jeff has works great, and its really easy to get them dialed in.............

 

They're a lil tricky if you have power jets! lol I couldnt' get it inside the bell. But I made due...

[Bansh-eman]

i didnt read your whole post but i saw you said your running 20:1 break in. you shouldnt run that much oil. your rings need to actually run your normal premix so they can seat properly to get a nice good seal. if you havent done your break in yet dont use that much oil go back to 32:1 or what ever your running normally. 20:1 is stupid rich

[CBAIER1206]

Doesn't yamaha reccomend running 24:1 during normal riding even though most people ignore that and run leaner? I've ran about a gallon so far just letting it idle for a long period and then doing some casual riding through the neighborhood...my neighbors cant be too thrilled by the way! I was gonna do another gallon then switch to 32:1 and run a full tank through and then it's on to 36:1 or 40:1.

 

Is this not a good idea?

[lowbuckracing]

i didnt read your whole post but i saw you said your running 20:1 break in. you shouldnt run that much oil. your rings need to actually run your normal premix so they can seat properly to get a nice good seal. if you havent done your break in yet dont use that much oil go back to 32:1 or what ever your running normally. 20:1 is stupid rich

Yeah I agree,These tits are mezzmerizing!!!!!ohooooohoooooohoooooooohooooooooh!!thanks,Bansheeman!