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Hello. Brand new to pit bikes. Thumpstar bogging...

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Son bought a used 2007 Thumpstar 110cc. It runs great, but just started bogging out. Do you have to clean the engine fins after riding it each time? Could that cause it to bog and die? I'll have lots more questions I think.

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I should add that it ran good until it got hot, then bogged down. I am going to add a pro taper xr50 bar set also, but I am assuming I'll need a longer throttle cable because these bars are higher. Any tips on doing this?

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Son bought a used 2007 Thumpstar 110cc. It runs great, but just started bogging out. Do you have to clean the engine fins after riding it each time? Could that cause it to bog and die? I'll have lots more questions I think.

 

Your problem is probably as simple as dirt/debris in the fuel system or a very dirty or poor quality air filter.  The air filters that come on these bikes are generally pretty terrible.

 

Try cleaning the fuel system first.

 

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Thanks. I noticed the previous owner removed the air filter and just has a hose running up. I'll see if I can get an air filter installed. Thanks.

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Thanks. I noticed the previous owner removed the air filter and just has a hose running up. I'll see if I can get an air filter installed. Thanks.

 

That is your problem, you or the PO had been just sucking in dirt all this time.  A carb cleaning and an air filter is your solution.

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Thanks. Not sure where to find parts for this, but I'll figure it out.

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Thanks. Not sure where to find parts for this, but I'll figure it out.

 

Universal pod air filters can be ordered by size almost anywhere MC parts are sold.

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RUNNING CONDITION

Please go through these steps:

Oil your air filter:
http://tboltusa.com/store/tech.php?pID=191/Air+Filter+Cleaning+and+Oiling

Engine and Carb quick check list:
http://tboltusa.com/store/tech.php?pID=88/Engine+and+Carb+quick+check+list

To Check Valve lash (Tappet adjustment):
http://tboltusa.com/store/tech.php?pID=62/Top+End%2C+Valve+Clearance%2C+and+Timing

Jetting guide:
http://tboltusa.com/store/tech.php?pID=61/Simple+Guide+to+Jetting

Most of the time you can tune new bikes in with the needle and brass screw adjustments and not need to change jets 

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Thanks tbolt. I think I just ordered some parts from you. He was riding it and it stopped running. Tried starting it and nothing. Now the bike gets NO SPARK. Had a friend small engine mechanic look at it and he can't figure it out. It does not have a kill switch or electric start. You kick start it and nothing. No spark at all. Any ideas?

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