lack of top end power | Scooter Doc Forum

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lack of top end power by: deanc - Aug 10, 2011 7:34:58 GMT -6

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Post by deanc on Aug 10, 2011 7:34:58 GMT -6

with the help of everyone here I have managed to adjust the valves, change the fluids, the plug. Clean the air filter and the belt. I have just finished replacing the clutch, I ordered this one, this is for the mc 54-250b by the way.
www.roketapartsonline.com/baja-atv-parts-clutch-assembly-11-16-splines-for-chinese-250cc-300cc-engines-p-9156.html

I counted the plines and they match. I tried sliders but went back to the rollers. all clean and properly installed. I went back to the gates belt that was on it because the new belt was cheap and filled the cover with black crumbs/dust. The old belt was fine the squeaking was the clutch. so.....
everything was fine till I got cheap crappy gas and changed these parts. I drained the gas from the tank and replaced it with no ethanol gas 93 oct. so now I wonder why the seeming lack of power? the belt size is 856, same as before when it did have more top end. I just did the valves last month, and the plug. the idle is at 1500, the timing is lined up. Could the new firmer clutch cause this? where the old worn out clutch allowed more top end with this belt. feels like it lacks take off and power at 50 mph doesnt want to really take off from there.

deanc PM deanc deanc's Posts deanc's Threads Certified Clinician Currently Offline Posts: 72 Likes: 0 Joined: Jul 8, 2011 8:04:14 GMT -6	lack of top end power by: deanc - Aug 10, 2011 7:36:33 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by deanc on Aug 10, 2011 7:36:33 GMT -6 Also there is no water in the oil or viceversa, oil is very clean as is the new coolant. Is it possible that the plug got messed up through all the work and bad gas?

deanc PM deanc deanc's Posts deanc's Threads Certified Clinician Currently Offline Posts: 72 Likes: 0 Joined: Jul 8, 2011 8:04:14 GMT -6	lack of top end power by: deanc - Aug 10, 2011 7:38:12 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by deanc on Aug 10, 2011 7:38:12 GMT -6 does the new clutch have a break in period?

sunlproblems PM sunlproblems sunlproblems's Posts sunlproblems's Threads Senior Clinician Currently Offline Posts: 120 Likes: 0 Joined: Jun 8, 2011 17:04:56 GMT -6	lack of top end power by: sunlproblems - Aug 10, 2011 8:38:36 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by sunlproblems on Aug 10, 2011 8:38:36 GMT -6 clean your carb out when i put a new clutch on my 125 it ran better by a few more mph at top end
	sunl sl250-29

deanc PM deanc deanc's Posts deanc's Threads Certified Clinician Currently Offline Posts: 72 Likes: 0 Joined: Jul 8, 2011 8:04:14 GMT -6	lack of top end power by: deanc - Aug 10, 2011 10:25:55 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by deanc on Aug 10, 2011 10:25:55 GMT -6 I expected it to run better, and am hoping its related to bad gas. do i just drain the bowl, or remove and disassemble?

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lack of top end power by: smokindawg - Aug 10, 2011 22:10:36 GMT -6

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Post by smokindawg on Aug 10, 2011 22:10:36 GMT -6

Since you have the carb off anyway, I'd clean it out completely. remove the jets and clean both them and the passageways with spray carb cleaner checking to make sure the cleaner goes all the way thru.

As cheap insurance, I'd also replace the fuel filter too.

Last Edit: Aug 10, 2011 22:11:18 GMT -6 by smokindawg

Viva 250

deanc PM deanc deanc's Posts deanc's Threads Certified Clinician Currently Offline Posts: 72 Likes: 0 Joined: Jul 8, 2011 8:04:14 GMT -6	lack of top end power by: deanc - Aug 11, 2011 6:01:41 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by deanc on Aug 11, 2011 6:01:41 GMT -6 just did the filter a week ago. is the carb why i have a lack of power now? could the idle be turned down too low?

deanc PM deanc deanc's Posts deanc's Threads Certified Clinician Currently Offline Posts: 72 Likes: 0 Joined: Jul 8, 2011 8:04:14 GMT -6	lack of top end power by: deanc - Aug 11, 2011 18:42:39 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by deanc on Aug 11, 2011 18:42:39 GMT -6 ok seafoam and cleaned power back but hard vibration on take off. but has top end. hmm weight outta the track?

deanc PM deanc deanc's Posts deanc's Threads Certified Clinician Currently Offline Posts: 72 Likes: 0 Joined: Jul 8, 2011 8:04:14 GMT -6	lack of top end power by: deanc - Aug 12, 2011 19:46:14 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by deanc on Aug 12, 2011 19:46:14 GMT -6 so re did it all. now everything good but got a squeak.