Question about 2003 Husqvarna SM 450 R

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I have a 2004 Husqvarna SMR450 always been very difficult to start and now will not start. Have removed carb stripped and cleaned out although no real problem found fitted new spark plug sparking ok got compression bike only done 700 miles from new, back fires when trying to start, any assistance would be grateful Cheers Jonathan

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You have too much fuel going into to cylinder if backfiring on carb there are 2 screws one for idle and one for mixture the mixture screw is the one you want turn this in 1/2 off turns or more if doesnt help this picture will help buddyI have a 2004 Husqvarna SMR450 always been very - e738b4f.jpg

Posted on Sep 08, 2009

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Husqvarna 45 carb jet blocked


Could be a fuel starvarion problem. Theres one thing you could try before you try stripping and cleaning the carb. Back off both tuning screws, and pull over till it fires. Then screw both back in and reset them to standard. H3/4 of a turn anticlockwise, L1 full turn anticlockwise. Then try firing it up again. Sometimes its enough to cklear any dirt in the carb. Failing that, Its a strip and clean.

http://www.ebay.co.uk/itm/Evinrude-Johnson-Mercury-Yamaha-Outboard-Motor-CARBURETOR-CARB-CLEANING-TOOL-/261167700551?pt=Boat_Parts_Accessories_Gear&hash=item3cceceda47

These carb cleaning tools are great, but you have to know where and where not to be putting them. Certain parts of Zama carbs and Walbro carbs have tiny valves within the carb. So be carefull.

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Check the exhaust, the muffler contains a gauze which can deteriorate and restrict gas flow through the exhaust. Have you stripped the carb down and checked the diaphrams/gaskets, removed high and low tuning screws, cleaned and reset to standard settings.?

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Check plugs, may be fouled> When storing bikes in my old mans garage, the plugs always foul

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Sounds like a fuel starvation problem, Strip and clean carb. Avoid using airlines to clean carbs. remove low and high adjustment screws, reset to factory settings. Walbro carbs are generally scew both of them back in all the way and then turn out 2 full turns each anticlockwise.

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1 Answer

Will not start


Do you have good compression.

If its flooding then its probably a carb issue. Strip and clean carb, check diaphrams and reset hi and low screws to standard settings. Screw both needles in and unscrew them:- H 3/4 of a turn anticlockwise and L 1 full turn anti clockwise.

Here's the breakdown for the carb. (dont use airlines to clean carbs)

3_3_2013_5_45_30_pm.jpg

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My husqvarna 288 wont start, has extreme high compresion and cant pull cord with the spark plug in it. easy to pull with spark plug removed


http://www.ebay.com/itm/HUSQVARNA-288-CARB-REBUILD-KIT-COMPLETE-TILLOTSON-NEW-/140290773535 Your carb.may need rebuilt,remove and inspect,did you leave gas in it while it was stored,if so then carb is suspect.About 80.00 for a shop to repair,14.00 for you to do it.

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1 Answer

My Husq 136 will start but has no torque, if you try to cut it loses power. Have cleaned fuel filter and air filter, no effect.


It sounds like you carburetor is dirty, this is common when they sit for extended amounts of time. First I would try removing the air filter and spraying the carb with carb cleaner and letting it soak in, Then start it up, (it may be difficult) when it starts rev it up and cover the air intake so it could possibly **** the blockage through, other wise you would need to disassemble the carb an manually clean it.

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Check the fuel lines for cracks/breaks. If they are o.k., then:

You will need to disassemble the carburetor and spray with carb.cleaner. Make sure the small screen is free of debris. (Should be able to see daylight through it.)

Use a Den Tek Brush, (http://www.drugstore.com/products/prod.asp?pid=165357&catid=1152), to clean the small portals in carb. These portals can become blocked. Reassemble and start.

If the carb. parts are more than 4 years old, you may have to replace them.

If you need further assistance, just let me know.

Jim

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