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Standard Jetting Specifications Carburetor # Venturi Size Main jet (VM4/042) Pilot Jet (VM22/210) Needle Jet Jet Needle Throttle Valve Air Jet TM32-1 32 250 45 Q-2 5FP17 4.0 None TM Series Carburetors provide significant performance improvements over older design round slide carburetors. Air flows faster and smoother through the TM Series venturi due to the flat slide configuration and the jet blocks which help create a smoothbore effect. The high velocity of the air flow means a stronger vacuum at the needle jet, providing more precise metering and better throttle response.
Additional Information
Specification Details SKU TM32-1 Brand Genuine Mikuni Country of Manufacture Japan Carburetor Application General Carburetor Size 32mm Carburetor Type Flat Slide Carburetor Mount Spigot Carburetor Intake Bell Diameter 58mm Engine Side Sizing 40mm Idle Location Left Accelerator Pump No Carburetor Depth 83mm Carburetor Height 160mm Carburetor Width 78mm Slide Type 832-39012 Main Jet Series VM4/042 Pilot Jet Series VM22/210 Needle Jet Series 389 Needle Series #6 Needle & Seat Type VM34/39 Starter Jet Series VM17/1002 Air Jet Series BS30/97 Float Height 17mm-19mm Questions & Answers
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I have a TM34 on a 1978 Yamaha DT400. It works great at 50% throttle and above. Below 25%, the engine surges. I have tried idle jet changes, needle changes, needle jet changes. Nothing helps. I even tried modifying the slide which helped a little. Now I'm wondering if it is too much carburetor and maybe I should be using the TM32. However, getting things working right is getting costly and I'd like an experienced persons opinion. Can you help?
Its pretty tough helping remotely with carburetor tuning, but we will do our best. The 34mm carb is a touch big for a bike of that nature, but its not too large enough to cause running problems. With that size carb you would sacrifice a little bit of bottom end, for more top end potential, compared to a 32mm. That said, it should still be perfectly ridable, and I dont think the size of the carb is enough reason for what you are describing.
Did you modify the slide, by removing material at the cutaway? If so, and if that helped, what you are doing is introducing more air, which tells me that your issue is too much fuel. What size pilot jet are you running? Does adjusting the air screw outward provide any improvement?Answer by: Web Support (Admin) on Feb 23, 2021 10:28:00 AM
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I have a TM34 on a 1978 Yamaha DT400. It works great at 50% throttle and above. Below 25%, the engine surges. I have tried idle jet changes, needle changes, needle jet changes. Nothing helps. I even tried modifying the slide which helped a little. Now I'm wondering if it is too much carburetor and maybe I should be using the TM32. However, getting things working right is getting costly and I'd like an experienced persons opinion. Can you help? - Shipping Estimation
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