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Posted by: YZGUY
I have a situation where I can be riding in the low desert one day (below sea level), and in the high mountains the next. You can't jet for everywhere, and you can't rejet your bike every day, so I just jet for sea level. When my bikes start to complain for lack of air when riding at high altitude, I just do an instant rejet by REMOVING THE AIRBOX LID. The effect is dramatic!!! This weekend my Rancher began to complain badly at high altitude. So, I just pulled the lid off, and presto it was a whole new bike! I was pulling 3rd gear power wheelies at 10,000', and ripping past people who were specifically jetted for high altitude!!
My utility bikes have FMF MegaMax II muflers and K&N air filters with waterproof Outerwears. In general, I prefer to have a sealed airbox on these bikes so they are waterproof for water crossings. The K&N has no resistance to airflow, so with the airbox lid on, THE LIMITING FACTOR FOR AIR FLOW BECOMES THE SNORKLE (you can only get in as much air as the snorkle opening will allow). I jet the bike for sea level under these conditions. But, when I get to high altitude, pulling off the airbox lid relieves the restriction of the snorkle, and you get the extra air you need for high altitude performance. GIVE IT A TRY!!!
Just a couple of notes- I have never been a big fan of running without an airbox lid. I think what I will do in the future is buy a second lid for each bike, and drill a bunch of 1" holes in it and install filtered air box vents (available from White Bros). This will give good airflow, but not be as vulnerable as running with no lid at all. And, don't forget to replace the (intact) lid when you return to low altitude, or you will be running LEAN which can damage you engine!!
Also, note that I am running a K&N. I can't say what a stock foam air filter will do. I know on the Hondas, they come with a filter insert that is very restrictive. With the stock filter, the limiting factor for air flow might just be the filter itself rather than the snorkle, in which case removing the lid wouldn't help. You will just have to try it and see. Also, if you have one of the (ridiculous!!) Yamaha airboxes where the lid holds the filter in place, you will have to go with the vented lid scenario, rather than just pulling the lid off (which would destroy your engine!!).
Posted by: YZGUY
Another tactic might be to drill your airbox, and cover the holes with duct tape. As you ascend to altitude, you can pull the tape off (a little at a time if you want) to get more air. If there is a deep water crossing, just replace the tape for the crossing and then pull it off again on the other side.
Posted by: YZGUY
springboy-God has blessed me, so I try to bless other people!! When I want to entertain someone, I don't invite them over for a barbecue, I take them riding!! And, my kids always have a lot more fun if they can take a friend along. Out here, riding is more than just going for a spin. We do big long weekend trips to the deserts and mountains, with a bunch of other families. We all park our trailers in a big circle and have a bonfire in the middle. It's more than just riding, it's a camping, outdoor, riding, social, etc. experience. Great family stuff!!
The 250 and Recon are actually my daughters old bikes, and we are keeping them around for her brother when he gets a little bigger. He is actually tall enough to ride the bigger bikes, but doesn't yet have the weight to handle anything bigger than the 90. And the 300 my daughter now rides, is my old trail bike. You have to have one set of bikes (sport) for the desert and dunes, and another set (utility) to handle the big rocks in the mountains. You can't ride a utility in the dunes, that would be rediculous!
Anyway, how do you pay for it all?? "Don't work for money, make your money work for you"!!
Posted by: YZGUY
No, never been to St, A. I don't have enough time to even ride my local stuff, much less time to travel that far.
Posted by: TNTQuadJunkies
YZGUY~~I was just wondering...didnt you just take a trip to St.anthonys sand dunes? How was it, correct me if im wrong...
Posted by: TNTQuadJunkies
And yes...thats exactly what we do too.I live 5 hrs. from the dunes and the allitude is double what it is here.it makes a huge difference
Posted by: springboy
This has nothing to do with the post but if i understand correctly you bought a quad for your friends to begin on and another beginner quad for you friends. Could you explain this. DO you just have money or what?
Posted by: springboy
Awwww ok i understand now i was just wandering, i hope i didnt offend you in any way.
Thats what we do screw the barbeque, go back in the woods 4 miles and start a bon-fire, set up a tent beside the creek, swim, fish, etc. etc. I just looked at your signature and "thought"/"assumed" that you bought them all at the same time. I payed foir mine thought end less days of roofing, farming. Thanks for straightning that up for me
