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Matt DixonParticipant
Ambrose just remember that the air density may be different next trip to the track. You should get yourself an AD gauge and take notes on your jetting, performance and the AD%. Before long you will have a good baseline jet set up.
Matt DixonParticipantMy guess is the silencer needs to be repacked, very simple to do.
As for want to look for when opening the top end is any scratches on barrel wall, blow by on the piston , not sure if you can with an 80 but look at lower rod bearing.
Matt DixonParticipantSounds like a lean condition to me.
By backing off throttle you are allowing less air = more fuel and you speed up. Fatten it up and see what happens
edit- I don’t own or race a Rotax but just saying by closing the slide and speeding up to me sounds lean…
October 16, 2013 at 10:19 am in reply to: Seeking opinion – Is a 15 yr old safe in a 125 shifter kart? #13004Matt DixonParticipantTJ has great points and my boy did climb the ladder. But the question was is it safe, and I stick with if he was safe in the Yammie he will be safe in a shifter.
No one should race over their head but to drive sure.
As for cost, after initial purchase I spent way more in TaG then Stock Moto.
October 16, 2013 at 8:31 am in reply to: Seeking opinion – Is a 15 yr old safe in a 125 shifter kart? #12993Matt DixonParticipantUnderstandable Dave as I mentioned you can restrict it to get him used to it.
The exhaust resricter
<span style=”color: #000000; font-family: ‘.HelveticaNeueUI’; font-size: 15px; white-space: nowrap; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.296875); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469);”>http://www.skusastore.com/mobile/default.aspx#P37552</span>
and a 2 hole airbox will knock about 12 HP off it and bring the kart down to about TaG Sr times
October 15, 2013 at 5:32 pm in reply to: Seeking opinion – Is a 15 yr old safe in a 125 shifter kart? #12946Matt DixonParticipantAge has nothing to do with it. My son was in one at 13. If he was safe in the Yammie he will be safe in a shifter.
Ability will determine if he is fast.
If your worried about it they have awesome braking. Or you can put an S5 restrictor and an airbox until he can keep it under him.
Matt DixonParticipantJust call Swedetech pick up one of their SuperNats rentals for the best price around and have a quality bullet. Drop a top end in it before every race and have them do the bottom end every winter. Can’t go wrong…
Matt DixonParticipantJust cut it in the middle slip a tube with an ID the same as the OD over it drop a weld and call it good
Matt DixonParticipantChris without knowing anything about your setup both things you mentioned (moving in hubs/rear bar in) will be adding more grip not free up the kart.
Matt DixonParticipantYou have got yourself overstuck.
you need to free the kart up.
Matt DixonParticipantJust go WFO
3rd or 4th lap will be the fastest
Matt DixonParticipantIts that time again…
September 20, 2013 at 5:21 pm in reply to: what can I expect when I change my front sprocket? #10400Matt DixonParticipant<span style=”color: #000000; font-family: ‘.HelveticaNeueUI’; font-size: 15px; white-space: nowrap; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.296875); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469);”>http://www.swedetechracing.com/tech_tips/gear_ratio_chart.html</span>
Matt DixonParticipantLets just say at last weekends ProKart race all I saw on the grid were R4’s….
Matt DixonParticipantRubber pick up exiting track?
Matt DixonParticipantWiring harness they go bad all the time. Swap it out with a known working one test before buying a new one
Matt DixonParticipantItal?
Matt DixonParticipantYou should be able to grab the axle next to the rotor and it should not be to hot to hold. If it is you are either on the brakes to much or trail braking to much. So smoking rotor is a serious wrong…
Matt DixonParticipantWe are hiding in the trailer going over it.
We would overlay tests with a teammate and improve both drivers by showing each their strength and weakness’s.
August 28, 2013 at 9:50 am in reply to: What parts break most frequently on Shifters/Chassis? – Please list your top 5 #8291Matt DixonParticipantExhaust springs are about the only that breaks regularly, granted you keep it on track like James said and you maintain your kart. Just as any kart check all nuts and bolts as 12,000 – 17,000 rpm’s tend to loosen everything…
Matt DixonParticipantLong enough…
Matt DixonParticipantI have found that they are .7 slower then MGs. They do handle more heat cycles before falling off. Set up is very close
Matt DixonParticipantYou can run the oil in your car all year in you don’t feel like changing it also…
Matt DixonParticipantTwo wraps with electrical tape over the set screws is all you need to keep them from backing out, then no problems removing them when changing axles.
Matt DixonParticipantReplace your set screws
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