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  #21  
Old 04-08-2017, 02:09 AM
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Dirt Dud Dirt Dud is offline
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I run 102 octane also and it seems to run very clean . I would call Bud at Mattos or Jim at Foxs trials barn they deal with these issues every day and have always been very helpful . Or you could put a Smart Carb on the bike I did do that to one of my trials bikes .


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  #22  
Old 04-08-2017, 01:04 PM
Jeff B Jeff B is offline
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Is it normal for it to have a low RPM irregular spaced slight pop on deceleration? Jeff
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  #23  
Old 05-10-2017, 09:47 PM
Jeff B Jeff B is offline
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Been riding the Contact about 3 times a week. Took it out doing trail work. It is perfect for trail work. Runs great. Got jetting pretty close now. Thinking about going to the Trials Training Center next week. I am ready to put it in trials sections. I have been doing vintage trials and am wanting to expand. Just having fun. From what I am hearing, this bike is a hot seller. Jeff
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  #24  
Old 06-04-2017, 05:18 PM
cheeseberger cheeseberger is offline
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Will 4th gear pull a long hill, and is it usable in a techy section on the Contact 250? The gap on my 2010 Sherco 290 between 3rd and 4th is too big for the type of riding I like to do, I want a more usable 4th gear. I miss my Scorpa SY250.

thanks
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  #25  
Old 06-04-2017, 10:56 PM
Jeff B Jeff B is offline
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Yes, it pulls 4th fine. 5th and 6th is where the gap gets bigger. So now it is time for a ride report. I went to the Trials Training Center. I got schooled by a 70 plus year old instructor. I rode it on the intermediate line. I rode my bike and tried a TXT 125. There is nothing that would hinder the Contact 250. The suspension is fine. I would not adjust it if it had clickers. The tires are O.K. for lower intermediate and less riders. Better tires will be helpful for more advanced riders. (I can't tell the difference) The only change I made was I went up to a 40 pilot. It puts the fuel screw more in the middle. It has a lean pop on deceleration, but it is NOT engine knock. The other change was I changed to the BLACK throttle tube. It slows down the acceleration and softens out the engine.. Starts easy, idles perfect, shifts good. I have used the bike as I said earlier in the post. Trials and trail work. The seat works very well. It would be nice if the hole for the seat mount was pre-drilled. I am very happy with the 250. For me, the 250 is a better choice than the 280. The 250 starts easier, has less hit, very little noise, and it didn't hurt that it was less money. Only negative is you can't run pump gas. I am running 102 unleaded race gas. Not a big problem in Nashville,Tn. I tried pump 91, race gas 98, 102, 105, 110 and 100LL avgas. 102 and 100LL (low lead) ran the same. Nashville small airports will not sell me avgas unless I have a airplane sitting there...I don't. But a friend does. I will stick to 102 race gas. Yup...I like it. Jeff
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  #26  
Old 06-10-2017, 06:53 PM
Jeff B Jeff B is offline
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Rode the Contact today. It ran crappy and was hard to start, fouled a plug. New plug and re-adjust fuel screw for hot weather. It is back to normal. A note to future buyers. I replaced the 36 pilot with a 40. I think I can fine tune summer to winter with the 40. It needed to be leaned out today. Jeff
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  #27  
Old 07-09-2017, 04:56 PM
kenfm2000 kenfm2000 is offline
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Quote:
Originally Posted by Jeff B View Post
Only negative is you can't run pump gas. I am running 102 unleaded race gas. Not a big problem in Nashville,Tn. I tried pump 91, race gas 98, 102, 105, 110 and 100LL avgas. 102 and 100LL (low lead) ran the same. Nashville small airports will not sell me avgas unless I have a airplane sitting there...I don't. But a friend does. I will stick to 102 race gas. Yup...I like it. Jeff
Jeff, I'm curious what the issue is with pump gas. I use ethanol free 92 pump gas and at my elevation (about 3300 ft) it seem to work fine. Is there a symptom I should look out for that will steer me towards race gas?

Are you still using the oem front sprocket? I read somewhere dropping 1 tooth in the front in addition to the black throttle tube is a great combo for the contact 250. I'm ordering the black throttle tube this week and might also get a new front sprocket.

Thanks!
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  #28  
Old 07-10-2017, 07:53 PM
Jeff B Jeff B is offline
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Higher octane has slower burn. Some say higher octane burns richer. Lower elevation like Nashville Tenn, has higher oxygen density. That may be why my bike is lean with lower octane. I just could not jet it. 102 octane was about right. It was still lean at low rpm. The 40 pilot was about right. The 40 made it perfect at idle to low rpm but rich coming into the needle. I dropped the needle 1 clip. Perfect! I went to a 9 tooth front because it was better for the very tight turns we make. I can not explain oxygen levels scientificlly, but, it works for me. It runs perfect, starts easy, idles perfect. I might run a 45 pilot in colder weather. You are at higher elevation, 92 might be about right. Jeff
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  #29  
Old 09-19-2017, 05:40 PM
Jeff B Jeff B is offline
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It has been a while. Any other ride reports from Contact owners? I richened the pilot to a 42. It starts better and has better off idle response. The lean pop on decal is completely gone. Spark plug looks good. Re-jetting is easy and no reason not to try. Check your jetting in a higher gear [4th]. Roll the throttle from idle and up. It should be smooth. I did a event. Rode the novice line. Had a blast. I would like to hear what other Contact owners have to say. Jeff
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